cobalt spinel vietnam

Spinel mines in Lục Yên. Translucent to transparent crystal. Red spinel from Vietnam. Free postage. 10-4 THE GEMOLOGY PROJECT is a free Gemological Encyclopedia that anyone can edit! confirms the progressive separation of the former spinel oxide in iron-rich and cobalt-rich spinel phases, without however revealing a pseudo-periodic organization of these phases, whatever the time of treatment. Spinel Color and Magnetism, Blue Spinel and Cobalt Spinel Cobalt Spinel - Home | Facebook The Spinel Group of minerals includes Spinel, Gahnite, Galaxite, Hercynite and Magnesiochromite. minfind.com - Spinel specimens from mineral dealers Press Release Lithium Nickel Cobalt Manganese Oxide Market Size 2021 with CAGR of -2.8%, Top Growth Companies: Umicore, NICHIA CORPORATION, Tanaka Chemical, and, End-User, SWOT Analysis in . gems. November 13 and 14; SAN FRANCISCO, CALIFORNIA: Show and sale; Pacific Crystal Guild; Fort Mason Center; Sat. Cab-Grade & Specimen Cobalt Blue Spinel Rough (Lục Yên, Vietnam) Brand New. from United States. SKU033963 Brand Pierre-Yves 216.00 € 194.40 € Including tax. Historically, fine red spinels were esteemed as much as ruby, and sometimes even . It is the most desirable color and is rarely found in today's market at affordable prices. 2.5ct Pear Shaped Cobalt Spinel - Ann Gems Blue Spinel: Strong band at 458nm, other weak bands at 478nm, 508nm, 555nm, 585nm, 635nm . Extremely rare cobalt spinel 0.51 carats. Luc Yen's capital of Yen The (22°6′38.84″ N, 104°45′57.80″ E) is a five- or six-hour drive from Hanoi on a 160 km expanse of good road. cobalt spinel for sale | eBay There really is very little of this true Vietnam cobalt for sale. Khe Khi, Luc Yen, Vietnam. The reason is, this gemstone is one of the most incredible and priceless objects of Nature . Spectrum : Red / Pink Spinel: Fine, fluorescent lines between 650nm and 700nm (known as Orange Pipe spectrum, best visible with blue filter), broad band centered at 540nm, other lines at 640nm and 470nm may be seen. Amity, Orange County, New York, United States. J115 - Spinel $ 190 (=~ £ 141) SOLD Kagoro, Kaduna State, Nigeria thumbnail - 0.7 x 0.7 x 0.7 cm (click on an image to enlarge) Single octahedral crystal of cobalt blue Spinel. There is only one known treatment for blue spinel called cobalt diffusion and we can easily detect it. Spinel Cobalt in Marble. Grey Spinel. Why is the Cobalt Blue Spinel so desirable and hunted for by Gem Connoisseurs? Krushev dol mine, Madan ore field, Rhodope Mts, Smolyan Oblast, Bulgaria. Post subject: Re: Luc Yen cobalt blue spinel. Cobalt Blue Spinel from Luc Yen mine in Vietnam is the rarest and most desirable fine stone, and the biggest hype in the modern gem industry. From: Le Comptoir Géologique. 2 BLUE SPINEL FROM LUC YEN, VIETNAM GEMS & GEMOLOGY SPRING 2015. I have passed many Red Spinels in my gem life. The sample was sent to and analysed by GRS with advanced analytical . Besides red, hot pink (from Tanzania's Mahenge mine) and blue, other popular colors include orange, bluish-green, lavender, purple, paler pinks, grey, black, and unusual mixtures of different hues. In stock Moscow. He has for sale a 37 point piece of rough for an unbelievable $4500. 0.70 Ct Natural No Heat Cobalt Blue Spinel |GIA| Octagonal| VVS. Cobalt Blue spinels from Luc Yen, Vietnam come in two types of blue. Spinel is the great imposter of gemstone history - many famous rubies in crown jewels around the world are actually spinel. Extremely Rare Natural 0.65 ct Cobalt Blue Spinel Vietnam Luc Yen Untreated. Spinel comes in blue, with the finest stones comparable to that of sapphires, and considered extremely rare. Extremely Rare ! Cobalt spinel is the rarest form of spinel, found less than five locations world wide. The vivid blue Cobalt Spinel on the left is colored predominantly by cobalt, but iron is also detectable with a spectrometer. This color is called cobalt. Price. Such "cobalt" blue spinels are highly sought after by collectors. Damage to two tips but little edge wear and good . S G 2 W F p o O 3 n s 3 4 3 o L r e d. Round Diamond Cut 4.5 mm.Natural Cobalt Blue&Blue Spinel Mae Sai 12Pcs/4.74Ct. Perfect for collection or jewellery projects such a filling screw top pendants.The total gemstone weight is 5.00 Carats.Thank You For Visiting The Gemstone Matrix Bright blue spinel, a more uncommon variety, has also been found in Baffin Island, Nunavut, Canada. Its hardness, equal to 8 on the Mohs scale, makes it suitable for any type of jewellery. From: Le Comptoir Géologique. The best pieces are an intense blue unique in the world of gems. At significantly shallower depths, above the Moho , calcic plagioclase is the more stable aluminous mineral in peridotite while garnet is the stable phase deeper in the mantle below the spinel . Free shipping. The right is known as the 'old mine' blue while the left is a more recent 'new mine' blue. $147 * 17mm x 12mm x 9mm. Cobalt blue mainly originates in Vietnam and Sri Lanka. They found that Baffin Island spinel contains up to 500 parts-per-million of cobalt, which gives it a vivid blue colour that is comparable to the best sources worldwide, found in Vietnam and the . Purple Spinel 15.28 Carats 13.30x16.46x7.74 MM Cushion Slight Natural Inclusions. This is the first occurrence where blue . Free shipping. As a result of this discovery, the Luc Yen district has become Vietnam's most important gemstone-trading center over the past 30 years. Proceedings of the International Symposia on Geoscience resources and Environments of Asian Terrains (GREAT 2008), 4th IGCP 516, and 5th APSEG . 3.56 Ct [SEE VIDEO] Natural Untreated Certified Rare Cobalt Blue Spinel Flawless. This gem glows bright pink under a Cheslea filter, and fluoresces a strong pink under long wave UV light, both due to cobalt. In the Luc Yen district, marble mountains contain several of blue spinel mines. The . but, It was hard to find like this bright color Red Spinel with low Iron content. The unique Cobalt Blue Spinel from the legendary Luc Yen mine in Vietnam. In addition to red, pink, orange and blue, spinel is found in a myriad of other colors. Spinel is a durable gemstone that is perfect for all jewelry uses. Grey . The sensation of 13-carat precisely cut and clean Vietnam Blue Spinel spread far beyond gem society, reaching Art Connoisseurs and Treasure Collectors worldwide. Date added. $147 * 20mm x 12mm x 6mm. Cobalt Spinel, 3.14 ct. Metallic blue Cobalt Spinel, 3.88 ct. Color-shifting teal . Thread starter Barrett; Start date Jul 27, 2017; Prev. According to their colour, the spinels are divided into red spinel ("ruby spinel" - blood red, "Ba-las" - pinkish red (Fig. Properties. £48.41. Sorting. The material discovered was a medium-light to medium-dark vivid blue, unlike the grayish blue spinel more commonly seen. Well-cut, loupe-clean vivid . In the last decade, the discovery of spinel deposits in Vietnam, Tanzania and northern Burma's (Myanmar) Namya region took the gem world by surprise with the production of incredibly beautiful colours such as the vibrant pinkish-red spinel from Namya. In the last decade, the discovery of spinel deposits in Vietnam, Tanzania and northern Burma's (Myanmar) Namya region took the gem world by surprise with the production of incredibly beautiful colours such as the vibrant pinkish-red spinel from Namya. Variety : SpinelColour : purplish Blue Cut : Pear Carat Weight : 2.5ct Measurement : 7.43x12.05x4.2mm Origin : Luc Yen, Vietnam Treatment : none Certificate : Beside the vivid red . In reality the color is just a tinge lighter than pics indicate. This rare color variety of the mineral mined in Vietnam, but it is extremely rare specimens over 1 carat. Latest creations . "Baffin Island is geologically similar to the Himalayas, where some of the world's finest gems have been found," said . Khe Khi, Luc Yen, Vietnam Ref. Spinel with cobalt traces is blue and is extremely rare. From: Le Comptoir Géologique. Spinel is rarely treated or heated. The lighter Cobalt Spinel on the right is less fluorescent and slightly more magnetic (SI 73 . Brand New. Such a big difference in price between cobalt blue spinel and gamespydaily is often the cause of speculation . The Luc Yen district of northern Vietnam is a very productive gem province and the leading source of vivid blue spinel. S ome 20 years ago near Lục Yên were found pieces of unusual, seemingly glowing blue spinel. Cobalt-blue spinel is a mineral that is largely unknown to those outside the world of mineralogy but produces gems that are highly south-after by collector around the world. Blue Cobalt Spinel || Luc Yen, Vietnam.Mixed lot of Cobalt Blue Spinel, some with distinct crystallisation. Khe Khi, Luc Yen, Vietnam. 7 7 4 S p Z o n J s 3 o J r e V D d C 3. In general, the market demand for violet and blue-violet to purple or violet spinel is often lower than that of other rare colors. Follow us on Instagram. AU $3,860.96. Oval Heavy Natural Inclusions Faceted. 98mm x 73mm x 38mm . or Best Offer. The most high-quality cobalt spinel is currently produced in Vietnam. £9.54 postage. 9 bids +$10.00 shipping. Time left 4d 5h left. Most blue spinels are deep in color tending towards gray, and some with a violet tinge. From: A Bijoux. Under the immersion microscope, a blue rim was noticed that was seen following the outline of the cut stone (Fig. - Weddingbee . Ruby, sapphire, and spinel from primary and secondary deposits are the most valuable of these; tourmaline, gem-quality feldspar, pargasite, and humite are also mined there. The karst mountains of An Phú, near Luc Yen in Vietnam, is the world's only source of that very neon tone . Other coveted colours are the electric cobalt blue (probably the rarest) mainly found in Vietnam and Sri Lanka, the highly fluorescent 'man-sin' spinel from Burma (Jedi spinel), hot pink 'Mahenge spinels' from Tanzania. SKU033964 Brand Pierre-Yves 216.00 € 194.40 € Including tax. Spinel Cobalt in Marble. Clarity - Being a Type II clarity gemstone . Lastly, it should also be noted here that the chemical composition of both cobalt . Vietnamese Red Spinel Rough from Luc-Yen Mine. Since then, he has returned on more than 120 occasions sourcing untreated rubies, spinel in pastel, vivid pink and the extremely rare cobalt blue hue, and bright pink no heat sapphires. Here is a very rare royal blue cobalt spinel from Burma. In stock Moscow. Watch. High Quality Natural Gemstone Rough Wire Wrapping/Jewelry. However, its color was more similar to a dark natural Cobalt-spinel from the origin of Sri Lanka, unlike Cobalt spinel from Vietnam or synthetic counterparts. (2019) In search of cobalt blue spinel in Vietnam. 5), "almandine spinel" - purple red (Fig. Spinel on Chondrodite - USA classic. Free shipping. Although Spinel is most famous for its red variety, it is also found in other colors such as green, blue, purple, brown and black. Maria Belmont, Joe's daughter and partner in KV Gems, recalls her first visit to Luc Yen in 2005, "I must have been 11 or 12 years old. Spinel is a transparent to opaque gem, with colors as vivid as ruby-like reds, some darker "brick" red, and some almost orange. From: A Bijoux. Mogok Valley, Mogok Township, Pyin-Oo-Lwin District . A continuum of blue between these two extremes can be found from this origin, as well . Pair of spinels 2.59 ct, Vietnam . $340. SPONSORED. $6,100 / $11,961/ct. Free returns. шпинель . Khe Khi, Luc Yen, Vietnam Ref. From: Well-Arranged Molecules. $ 125.00. 77502) is a black mixed oxide of Iron (II, III), Cobalt (II) and Chrome (III) with chemical formula (Co,Fe)(Fe,Cr) 2 O 4 and a spinel structure. Click to See a Selection of Blue Spinel Stones for Healing on Etsy. Set of gray-purple spinel in a circle cut 2.29 ct, Vietnam. C $30,885.02. This particular hue is very rare in a spinel and in gemstones in general. Finds of cobalt blue spinel in Lục Yên, Vietnam. Synthetic spinel can also be created, providing an economical option that still boasts the clarity and beauty of the natural version. Synthetic Spinel 4,39 ct . The reason is, this gemstone is one of the most incredible and priceless objects of Nature . Loose Gemstone 8-10 Ct Burma Red . 10-6, Sun. Sri Lanka, Myanmar (Burma), India, Tanzania (Umba valley), Vietnam, Afghanistan, etc. The Luc Yen district is located in the Yen Bai province, in the north of Vietnam. Premium. Nalin Danushka Leave a Comment on Natural Red Spinel Rough Stone from Vietnam Posted in Gem Hunting Travels, Gem Mining, Stories. Free shipping. Synthetic Spinel 4,86 ct . Stockton, 1984; Delaunay, 2008 . / screenshot from Field Gemology by Vincent Pardieu, Youtube video In short. The cost of cobalt blue spinel starts from $2000-3000 and can exceed $10,000 per carat. This wonderful specimen we were able to obtain on our trip to the mine in Vietnam last year, believe me, (or check the net) these are not easy to come by, particularly in any size above very small! Cobalt Spinel (1) Spodumine (0) Taaffeite (0) Topaz (10) Tourmalines (71) Tourmaline colour change (31) Zircons (86) Alexandrites (4) Alexandrite Color Change (0) Ametrine (3) Andalucite (1) Apatite (18) Apatite Catseye (9) Beryl (30) Chrysoberyl (90) Chrysoberyl Catseye (68) Citrine (24) Pairs (3) newsletter. Cobalt Aluminate Blue Spinel (PB28) Pigment Blue 28 (C.I. 1.5+ct top color cobalt spinel from Luc Yen district in Vietnam "There are few stones that match its intense blue colour." Even small stones with good transparency and fine cobalt-blue colour can sell for about ten times the price of a comparable sapphire. Orange Spinel, 4.21 ct. Volcanic reddish orange. In this paper, we present the main impurities in natural blue spinel from the Luc Yen mining area in Yen Bai province, Vietnam. Spinel is naturally found with a wide range of colours, from red, through pink and violet to bright blue. "There's considerable interest in cobalt-blue spinel for gems and jewelry," said Belley. Relevance. AU $2,510.46. Cobalt spinel is the rarest form of spinel, found less than five locations . from Thailand . However, the cobalt diffusion-treated samples seem to have somewhat higher cobalt contents but lower iron content than the natural ones. These are generally termed "fancy" spinels, and occur most often in shades of mauve, violet, purple and blue-green. Single octahedral crystal of cobalt blue Spinel. or Best Offer. C $2,470.80. In Color Summer, 43, 43-49. Baffin Island spinel, the researchers found, contains up to 500 parts-per-million of cobalt, which gives it a vivid blue color — a color comparable to the highly coveted material found in Vietnam and the Himalayas. Well-cut, loupe-clean vivid . Most blue spinels contain Iron or Zinc which given them a darker tone. It provides a bluish black shade. It is all about its extremely limited production, size range and availability, and its otherworldly natural untreated color above all. GALENA - SPINEL LAW TWIN, SPHALERITE. Spinel from Vietnam. Picture by Irzhi Korn Noble spinel is characterized by a variety of colours (Fig. "There's . In an attempt to reveal this organization, a specific method of preparation . Filter. The spinel usually occurs as a small octa-shaped crystal. Cab-Grade & Specimen Cobalt Blue Spinel Rough (Lục Yên, Vietnam) £1,466.97. New (Other) $27.00. CERTIFIED 2.08 CTS SPINEL RICH COBALT BLUE [STS975](12041803) Natural Cobalt Spinel Sri Lanka - Danu Group; Srilankan Untreated Certified Cobalt Blue Spinel 5.32 Ct . $280. But lavender-like light blue is one of the most commercially . or Best Offer. $33 * 12mm x 10mm x 5mm. Natural Unheated Cobalt Blue Spinel 2.30 Cts Sri Lanka Oval VVS . This study characterizes the origin and gemological properties of these spinels, especially the cause of their unusually bright color, which is directly related to their value. b University of Science, Vietnam National University Ho Chi Minh City, 227 Nguyen Van Cu St., Ward 4, . SKU033965 Brand Pierre-Yves 216.00 € 194.40 € Including t Free shipping. Spinel, (Mg,Fe)(Al,Cr) 2 O 4, is common in peridotite in the uppermost Earth's mantle, between approximately 20 km to approximately 120 km, possibly to lower depths depending on the chromium content. True Cobalt spinels are very rare and are only consistently found in Vietnam and Sri Lanka. Credit: Philippe Belley. Free returns. For sale is a small but exquisite group of cobalt spinel on matrix from Vietnam. Synthetic. SPONSORED. Nevertheless, these minerals are chemically distinct. 1; 2; First Prev 2 of 2 Go to page. In terms of clarity, spinel is often cleaner . Specifically the dark red Garnet which can . Signup and get a Voucher worth $250. In stock Quantity in stock:1 . On a broader scale, the intense, richly-colored natural Spinel gemstones are preferred over light or dark ones, regardless of the shade. 24 items. Vietnam, Sri Lanka. 4), the range of colours depends on the composition of chromophores. *voucher is valid only on new registration . Spinel. Long regarded as . The blue spinel is a rich blue cobalt hue that competes with some of the best sabers you'll ever see. Spinel's recent rise in notoriety was also aided by the discovery of cobalt spinel in Yên Bái Province, North Vietnam at nearly the same time as pink spinels of the Mahenge region. The sensation of 13-carat precisely cut and clean Vietnam Blue Spinel spread far beyond gem society, reaching Art Connoisseurs and Treasure Collectors worldwide. Platinum Silver Blue Spinel 1.40 Carat Cushion Vvs Untreated Vietnam Rare Colour. (2008) Petrography and some mineral chemistry of gem-bearing marble from Luc Yen deposit, Northern Vietnam. Buma, Sri Lanka. Go to Top . ppgems.com. Synthetic Spinel 4,39 ct . Chemical and spectroscopic analyses indicated that the blue color is due to cobalt (Co North Vietnam is a major producer of vivid blue spinel for the gem market. Blue cobalt spinel from Vietnam - SSEF COBALT SPINEL ON ALBITE - Blue Gems; What are your favourite gemstones and why? Vietnam - the country known to produce some extremely fine qualities of rubies, sapphires, spinels, peridot, aquamarine, topaz, etc; it is gifted with some 70 gem deposits and 160 different occurrences (Huong et al, 2012). compositions of natural cobalt spinel samples also give the same order of magnitude of major, minor and trace element constitutes as the cobalt diffusion-treated ones (Table 1). Synthetic. Check out our spinel vietnam selection for the very best in unique or custom, handmade pieces from our shops. Spinels have a wide range of color: Red, Pink, Orange "Flame", Blue, Purple, Violet, Grey, Metallic, Green, almost Colorless, Black, etc. AU $5,149.66 . Spinel is the official Birthstone for August. As far as the shade is concerned, the blood-red Spinel is considered the most desirable, followed by the clean Cobalt Blue Spinel. But supply is an issue and even production from the most significant source, Vietnam, is limited and . Beside the vivid red . or Best Offer. B lue spinels are mined in Sri Lanka, Tanzania, Myanm ar, Pa kistan, and Vietna m (Shi gley a nd. Free shipping. COBALT SPINEL GROUP ON MATRIX. Though two tips are damaged, it has very little edge wear and good surface luster. This gem is small and would have been "native cut" from a very small stone most likely . This is most common in rounded grains and aggregates. The blue Spinel is colored by cobalt and is quite beautiful. S p o T J U n R C 8 s Q o r I e d 9 F. LUC YEN COBALT BLUE SPINEL ROUGH | FRESH FROM THE MINE; UNSORTED! $2,000.00. Abstract. Unfortunately Luc Yen produces only little stones in this color - a 0,25 ct would be large. . Seen here, a 2.24 carat Cobalt Blue Spinel accented by Hauyne & Diamonds. Iron Cobalt Chromite Black Spinel (PBk27) Pigment Black 27 (C.I. Today similar stones have been found in some more countries around the world but cobalt blue spinel still is very rare and increasingly . Nov 25, 2017 #31 Barrett - I think you are VERY lucky to have access to those cobalt beauties and I suspect at better prices than many of us would be able to acquire them for (IF we could . A fine and well defined group of crystals (for the location, or anywhere for that matter) electric blue cobalt , with cobalt as the coloring agent. Free returns. Cobalt blue mainly originates in Vietnam and Sri Lanka. $33 * 12mm x 9mm x 6mm. Yes, it was marked "cobalt spinel" and "Vietnam" but nothing registered except the intense electric blue color that blew everything else away io. Cab-Grade & Specimen Cobalt Blue Spinel Rough (Lục Yên, Vietnam) Brand New. It is the colour of an old cobalt medicine bottle, if you have ever seen one you'll know exactly what I mean. 307a) and this suggested a diffusion-treatment. A fine spinel of over two carats is an exquisite treasure to be enjoyed for a lifetime, and for many future . Although spinel has been used in jewelry since ancient times, this gemstone has only recently received the attention it deserves. Together with identifying impurities and their valence, we have taken into account the site of some impurities in the MgAl2O4 spinel structure by using sensitive techniques, including Electron Microprobe Analysis (EMPA), UV-Vis-NIR, electron spin resonance . It wasn't until I got home and did some research (the name of the mine was scribbled and barely legible on the back of the box) and found the same dealer discussing the small find on a GIA video that I realized how it was a Luc Yen spinel that I'd . Spinel colours are always natural as this gemstone does not commonly undergo treatments and this is what makes it a great value gemstone, a worthy substitute for ruby or sapphire.Burmese quality red is the most vivid in nature. Cobalt blue spinel - a sample of neon blue, ultramarine blue. Yen Bai Province, Vietnam TSSLRocksandPins 5 out of 5 stars (106) $ 75.00 FREE shipping Add to Favorites Dark Cobalt Blue Vivid Blue . In Burma , where some of the most beautiful colors are mined, spinel was recognized as a separate gem species since 1600 but in other countries the masquerade continued for hundreds of years. $18.53 shipping. 3.90 Classic Cobalt Blue Spinel, VVS, 3.08 Ct. Rare Cobalt Blue Natural Spinel Loose . Our stones have n The markets of Yen The, the capital of Luc Yen, offer an additional assortment of . 1.16 Carat Precision Pear Shape Cobalt Spinel from Luc Yen Vietnam, GRS report GranGem 5 out of 5 stars (77) $ 6,995.00 FREE shipping Add to Favorites 3-5mm Cobalt Blue Spinel Crystals from Vietnam. | 750 CT. Sutthirat C, Lapngamchana S., Pisutha-Arnond V., Khoi N.N. Synthetic. SPONSORED. 6)), pink spinel ("iris . JOIN NOW! In addition to Burma, now known as Myanmar, spinel is mined in Sri Lanka, Tanzania, Tajikistan and Vietnam. Khe Khi, Luc Yen, Vietnam Ref. Similarly striking colours have also surfaced in the Mansin mines located in the Mogok valley. It is most often faceted in oval, cushion and pear shapes and is mostly small calibrated sizes due to its rarity. or Best Offer. Spinel has been mistaken for ruby and sapphire in many royal jewel collections and is going up in price rapidly especially in Red, Pink and the rarest color, blue. $800 / $349/ct. The most valued Spinel colors are bright red, cobalt blue, vivid pink, and orange. Joined Jun 30, 2014 Messages 2,030. 46mm x 38mm x 29mm. Spinel Cobalt in Marble. $415.88. To achieve Cobalt spinel status, it must contain enough Cobalt to make the gem a brightly coloured blue, much like a cornflower blue colour in a blue sapphire. Cobalt spinel in Vietnam breaks the price record every year because it become rarer and rarer and it's almost impossible to find a wellcut fine cobalt spinel 1ct Beside the crazy color, you can find all the incredible beauty factors in a fine cobalt spinel such as brilliance, vibrancy, sparkle, high hardness, super high rarity; that make Vietnam Cobalt spinel become the most extraodinary blue . Rubies as well as spinels were first . All of the district's blue spinel mining sites lie within 20 km of Yen The. Spinel is a historically important gem . Dad had already been to Vietnam a few times and was very excited to . Facet . Vietnam cobalt spinel cut stones for sale. lilmosun Ideal_Rock. $33 * 12mm x 10mm x 5mm . These smurf-blue deposits owe their rare coloration to cobalt that joined the minerals as the gemstone was forming. The intense pinks and reds are caused by traces of chromium, the same element that gives rubies their color. In stock Quantity in stock:1 . We are a leading global manufacturer of Cobalt Aluminate Blue Spinel (PB28), a blue pigment that ranges from reddish blue to turquoise blue. Spinel gemstone from Vietnam. Cobalt Spinel. from United States. 77346) is a blue mixed oxide of Cobalt (II) and Aluminum (III) with chemical formula CoAl 2 O 4 and a spinel structure. Red Spinel 1.68 Carats 6.68x8.29x3.24 MM. The intense pinks and reds are caused by traces of chromium, the same element that gives rubies their color. Besides red, hot pink (from Tanzania's Mahenge mine) and blue, other popular colors include orange, bluish-green, lavender, purple, paler pinks, grey, black, and unusual mixtures of different hues. ! Buy online from $444 to $37,980 on ppgems.com. Before the rise of modern gemology in the late 19 th and early 20 th centuries, spinel was often identified as corundum, as they are often found in the same mines. Spinel in dolomitic marble. Similarly striking colours have also surfaced in the Mansin mines located in the Mogok valley. If it is a blue cobalt spinel without gray tone compared with the same level of color, the difference in value may reach 10-100 times! Go. H B S 1 J p o n B s X o r C e B d E . Cobalt Blue Spinel from Luc Yen mine in Vietnam is the rarest and most desirable fine stone, and the biggest hype in the modern gem industry. Star Spinels and color-change Spinels are also (rarely) found. These are reference stones I use when sourcing for this material in cut or rough form and are amongst the finest colours to the best of my knowledge.

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