















Cobalt spinel from Tanzania 0.284ct loose Japanese and German
This beautiful blue. This hard shine with a Mohs hardness of 8. "Blue spinel" does not necessarily mean "cobalt spinel", but only those with visible cobalt bands are called "cobalt spinel".
This is a cobalt spinel with a cobalt band. It comes with sorting from the Japan-Germany Gemstone Institute.
Type: Loose (natural stone)
・Stone name: Cobalt spinel
Weight: 0.284ct
・Size: 3.6×3.3mm
・Shape: Emerald cut ・Scratches/chips: S
Inclusions: A+
·remarks:---
・Accessories: Sorting (Japan-Germany Jewelry Research Institute), Caratz quality certificate, loose case (if it does not fit, a clear case with zip)
▷For more information about spinel
Spinel characteristics, types, counterfeits, value standards, etc.
▷Jewelry processing available
If you would like to have your item made into jewelry, please order it along with your desired setting using the link below.
・[Select by stone] Simple order
・[Select by stone] Semi-custom
*If you would like an image of the stone in the frame, would like to discuss a full order, or have any other concerns or questions, please feel free to contact us here .
*Raw stones are not available. There are also some stones that cannot be handled.
*We try to make the colors in the photos as close as possible to the actual product, but they may look slightly different from the actual product depending on the lighting conditions at the time of shooting and the monitor environment you are using. Also, some photos may have been taken using a penlight.
*For information on scratches, chips, treatments, and inclusions, please click here .
*For other frequently asked questions, please click here .
karatz_item_id: 12542144
Type: Loose (natural stone)
・Stone name: Cobalt spinel
Weight: 0.284ct
・Size: 3.6×3.3mm
・Shape: Emerald cut ・Scratches/chips: S
Inclusions: A+
·remarks:---
・Accessories: Sorting (Japan-Germany Jewelry Research Institute), Caratz quality certificate, loose case (if it does not fit, a clear case with zip)
▷For more information about spinel
Spinel characteristics, types, counterfeits, value standards, etc.
▷Jewelry processing available
If you would like to have your item made into jewelry, please order it along with your desired setting using the link below.
・[Select by stone] Simple order
・[Select by stone] Semi-custom
*If you would like an image of the stone in the frame, would like to discuss a full order, or have any other concerns or questions, please feel free to contact us here .
*Raw stones are not available. There are also some stones that cannot be handled.
*We try to make the colors in the photos as close as possible to the actual product, but they may look slightly different from the actual product depending on the lighting conditions at the time of shooting and the monitor environment you are using. Also, some photos may have been taken using a penlight.
*For information on scratches, chips, treatments, and inclusions, please click here .
*For other frequently asked questions, please click here .
karatz_item_id: 12542144
Choose options



![[Restock on June 27th at 10 PM] Authentic Gemstone Encyclopedia 3D Stickers Vol. 1: The Big Five Gems](http://store.karatz.jp/cdn/shop/files/IMG_3658.jpg?v=1781061036&width=3384)
![[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"](http://store.karatz.jp/cdn/shop/files/collage_1ee7abcc-c785-4fbd-899f-b5b6978964a7.png?v=1782794728&width=3000)
![[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"](http://store.karatz.jp/cdn/shop/files/collage_7372b521-c1f6-4b48-8378-4ef004170822.png?v=1782796302&width=3000)
![[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"](http://store.karatz.jp/cdn/shop/files/collage_b55eecef-85e7-452d-8e9b-0c3480fd174b.png?v=1782796906&width=3000)
![[Awaiting appraisal] "Sourced in Hong Kong - Limited 8 stones" Afghanistan Green Hauyne Loose Stone [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/collage_b5c226ed-0d3a-47fc-886d-8a1b5cfbbab5.png?v=1782718065&width=3000)
![[On Sale June 6th at 10 PM JST] "Limited 13 Stones" Fluorite Gacha including flawed Koshu cut gemstones "Bulk Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/50_28755117-0a9d-4247-82f9-d24573a88140.png?v=1782350508&width=2268)
![[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/51_69f45db0-6569-4905-b7e3-c9430e518415.png?v=1782351935&width=2268)
![[Sales start 10 PM on 6/26] Limited to 30 sets: 1 in 10 is a pair of 2 stones - Zambian emerald loose stone (approx. 6x4mm, emerald cut) with deep color. (Multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_7d2f620b-700f-46fb-846b-e73a39606c51.png?v=1782813430&width=3000)
![[On Sale June 6th at 10 PM JST] "Limited 13 Stones" Fluorite Gacha including flawed Koshu cut gemstones "Bulk Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/collage_e24ee4a0-1bb9-4e19-9a6a-6fa75b4cf864.png?v=1782726871&width=3000)



















![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)