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cobalt spinel

Spinel is one of the birthstones for August. Among spinels, those that contain a large amount of cobalt and exhibit a bright blue color are called cobalt spinels. The shade of blue is thought to change depending on the cobalt content, and the darker the blue, the more valuable it is.

Karatz GemMagazine
" Cobalt Spinel "

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Sold out Cobalt Garnite 1 stone (discount available for multiple purchases)
Sold out [Available at 10 PM on August 9th] [Limited to 2 stones] 1 Nigerian Cobalt Garnite [Multiple purchase discounts available]
Sold out スリランカ産コバルトスピネル 0.647ctルース
Sold out ベトナム産コバルトスピネル 0.063ct原石 (カラーシフト)
Sold out ベトナム産コバルトスピネル 0.331ct原石
Sold out ベトナム産コバルトスピネル 0.142ct原石
Sold out ベトナム産コバルトスピネル 0.088ct原石
Sold out ベトナム産コバルトスピネル 0.085ct原石
Sold out ベトナム産コバルトスピネル 0.078ct原石
Sold out ベトナム産コバルトスピネル 0.075ct原石(カラーシフト)
Sold out ベトナム産コバルトスピネル 0.063ct原石
Sold out 非加熱コバルトスピネル(コバルトブルースピネル) 0.740ctルース(シールドカット) GIA
Sold out ナイジェリア産コバルトガーナイト 0.707ctルース
Sold out Nigerian Cobalt Garnite 0.311ct Loose Stone JTL Catalog
Sold out 【スタッフセレクション】タンザニア産カラーチェンジコバルトスピネル 0.249ctルース(セミオーダーメイドセッ
Sold out コバルトガーナイト 0.251ctルース
Sold out コバルトガーナイト 2.909ctルース
Sold out K18コバルトスピネル0.154ct リング 日独付 - KARATZ STORE|カラッツSTORE
Sold out Pt900コバルトガ―ナイト0.04ct / 0.04ct ピアス - カラッツSTORE

KARATZ Custom Made

Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.

KARATZ・Five Commitments

So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.

KARATZの取り組みと社会貢献

業界発展のための後進育成や事業協力、宝石の国スリランカの子どもたちへの支援活動など、KARATZの取り組みについてご紹介いたします。

KARATZ Books

These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.

jeweler's tools

For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.