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spinel

Spinel is the birthstone for August. Spinel comes in a wide variety of colors, including red, blue, pink, green, purple, black, gray, and colorless. It has a high Mohs hardness of 7.5 to 8, so it can be enjoyed as everyday jewelry. They are often produced in the same octahedral crystal form as diamonds, and their rounded, soft form gives them a different charm than cut gemstones.

Karatz GemMagazine
" Spinel "

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パープルスピネル 0.424ctルース（ローズカット）

Purple spinel 0.424ct loose (rose cut) Sale price¥9,800
Pink spinel 0.290ct loose

Pink spinel 0.290ct loose Sale price¥7,980
パープルスピネル 0.210ctルース

Purple spinel 0.210ct loose Sale price¥6,980
ラベンダースピネル 0.160ctルース

Lavender spinel 0.160ct loose Sale price¥5,980
Sold out 【ダンデライオンカット】グレイパープルスピネル 6mm/1.011ctルース《コラボ》 日独鑑 ワッペン付

(Used in July 2025 Gacha) [Dandelion Cut] Gray Purple Spinel 6mm/1.011ct Loose Stone [Collaboration] Japan-Germany Mirror with Patch

Sold out 【ダンデライオンカット】パープルスピネル 6mmルース ワッペン

(Used in July 2025 Gacha) [Dandelion Cut] Purple Spinel 6mm Loose Stone "Collaboration" Patch

Sold out 【ダンデライオンカット】スピネル5.5mmルース ワッペン付

(Used in July 2025 Gacha) [Dandelion Cut] Purple Spinel 6mm Loose Stone with Patch

Bicolor spinel 1.17ct loose

Bicolor spinel 1.17ct loose Sale price¥79,800
Sold out Red spinel rough stone 1 stone (raspberry color)《Discount available for multiple purchases》

Red spinel rough stone 1 stone (raspberry color)《Discount available for multiple purchases》

Sold out Let's try gemstone polishing "Do-it-yourself rough stone polishing set" (for advanced users: rough spinel from Mozambique)

Let's try gemstone polishing "Do-it-yourself rough stone polishing set" (for advanced users: rough spinel from Mozambique)

Sold out Limited Stock! Rare Stone Gacha with Certificate of Authenticity (Taaffeite, Bicolor Spinel, and Benitoite) - 1 Loose Stone (Multiple Purchase Discounts Available)

Limited Stock! Rare Stone Gacha with Certificate of Authenticity (Taaffeite, Bicolor Spinel, and Benitoite) - 1 Loose Stone (Multiple Purchase Discounts Available)

Sold out [Available at 10 PM on August 16th] [Limited to 9 stones] Spinel Gacha (August birthstone) including one bicolor spinel (0.93 ct) [Multiple purchase discounts available]

[Available at 10 PM on August 16th] [Limited to 9 stones] Spinel Gacha (August birthstone) including one bicolor spinel (0.93 ct) [Multiple purchase discounts available]

Sold out タンザニア産マヘンゲスピネル 0.697ctルース

タンザニア産マヘンゲスピネル 0.697ctルース

Sold out [Available at 10 PM on August 15th] Limited to 15 stones: One in five stones is a dandelion-cut spinel. Get one specially cut August birthstone spinel gacha (plus one mahenge spinel). Discounts available for multiple purchases.

[Available at 10 PM on August 15th] Limited to 15 stones: One in five stones is a dandelion-cut spinel. Get one specially cut August birthstone spinel gacha (plus one mahenge spinel). Discounts available for multiple purchases.
Sold out 【サンジェ氏】パープルスピネル 0.740ctルース

Sri Lankan Purple Spinel 0.740ct Loose Stone
Sold out スタースピネル 0.936ctルース

Myanmar Star Spinel 0.936ct Loose
Sold out ミャンマー産レッドスピネル 0.234ct原石

Myanmar red spinel rough stone 0.234ct
Sold out ミャンマー産レッドスピネル 0.226ct原石

Myanmar red spinel rough stone 0.226ct
Sold out Night purple 13 stone set (hackmanite, tanzanite, black spinel, diamond, etc.) Half eternity ring set (2.0mm)

Night purple 13 stone set (hackmanite, tanzanite, black spinel, diamond, etc.) Half eternity ring set (2.0mm)
Sold out ビルマ産ホットピンクスピネル 0.181ctルース

Burmese hot pink spinel 0.181ct loose stone
Sold out タンザニア産コバルトスピネル 0.284ctルース

Cobalt spinel from Tanzania 0.284ct loose Japanese and German
Sold out スリランカ産コバルトスピネル 0.647ctルース

Cobalt spinel from Sri Lanka 0.647ct loose Japanese German edition
Sold out スピネル 0.330ctルース

Spinel 0.330ct loose
Sold out ピンクスピネル 3.6mm/0.217ctルース

Pink spinel 3.6mm/0.217ct loose
Sold out スピネル 3石セット0.328ctルース

Spinel 3 stone set 0.328ct loose

Sold out K18ブルースピネル0.31ct・ローズカットダイヤモンド・アクアマリンリング - カラッツSTORE

K18 Blue Spinel 0.31ct/Rose Cut Diamond/Aquamarine Ring

Sold out ビルマ産バイカラースピネル 0.959ctルース

Burmese bicolor spinel 0.959ct loose

Sold out 非加熱ビルマ産レッドスピネル 1.090ctルース AIGS

Unheated Burmese red spinel 1.090ct loose AIGS

Sold out 【ダンデライオンカット】カラーレススピネル 9.5mm/3.650ctルース 日独オリジナル鑑＆ワッペン

[Dandelion Cut] Colorless Spinel 9.5mm/3.650ct Loose Japanese-German Dictionary & Patch

Sold out 【さくらインカット】スピネル 0.691ctルース - カラッツSTORE

[Sakura Incut] Spinel 0.691ct loose

Sold out 【さくらインカット】グレースピネル 5.5mmルース ワッペン付（プラチナスピネル） - カラッツSTORE

[Sakura Incut] Gray Spinel 5.5mm Loose with Patch (Platinum Spinel)

Sold out レッドスピネル 0.251ctルース

Red spinel 0.251ct loose

Sold out レッドスピネル 0.213ctルース

Red spinel 0.213ct loose

Sold out 【カラフリ】K18合成スピネルリング - カラッツSTORE

[Colorful] K18 synthetic spinel ring

Sold out バイカラースピネル 1.630ctルース（ブルー／グレー系）

Bicolor spinel 1.630ct loose (blue/gray)

Sold out Pt950グレースピネル0.31ct リング（プラチナスピネル） - カラッツSTORE

Pt950 Gray Spinel 0.31ct Ring (Platinum Spinel)

Sold out K18ブルーサファイア・レッドピンクスピネル2石リング - KARATZ STORE｜カラッツSTORE

K18 blue sapphire/red pink spinel 2 stone ring

coming soon Pt950 グレースピネル（プラチナスピネル） 0.685ct リング

[8/16 (Sat) 10:00 AM Deadline] Lottery Sale 10_Pt950 Myanmar Gray Spinel (Platinum Spinel) 0.685ct Ring Sale price¥128,000
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)

Vietnam Cobalt Spinel Rough Stone 0.063ct (Color Shift)
Sold out 【サンジェ氏】パープルスピネル 0.542ctルース

Sri Lankan Purple Spinel 0.542ct Loose Stone
Sold out タンザニア産ピンクスピネル 0.842ctルース

[Available at 10 PM on August 16th] [Sakura In-Cut] Tanzanian Pink Spinel 6.0mm/0.842ct Loose Stone with Certificate of Authenticity
Sold out ミャンマー産レッドスピネル 0.165ctルース

Myanmar Red Spinel 0.165ct Loose
Sold out ミャンマー産レッドスピネル 0.183ctルース

Myanmar Red Spinel 3.5mm/0.183ct Loose Stone
Sold out スタースピネル 1.259ctルース

Sri Lankan Star Spinel 1.259ct Loose Stone
Sold out 【ダンデライオンカット】ピンクスピネル 5.7mm/0.845ct ルース《コラボ》日独鑑 ワッペン付

[Dandelion cut] Myanmar pink spinel 5.7mm/0.845ct loose stone by Nikkei Kane

Sold out スタースピネル 2.626ctルース

Myanmar Star Spinel 2.626ct Loose
Sold out レッドスピネル 0.368ct原石

Myanmar red spinel rough stone 0.368ct

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.