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5 major gems

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Sold out Single loose Russian oil-free emerald (1.6-1.7mm, princess cut) {Multiple purchase discounts available}

Single loose Russian oil-free emerald (1.6-1.7mm, princess cut) {Multiple purchase discounts available}

Sold out Limited to 16 stones: 1 Montana sapphire loose stone (including teal blue and bicolor) Multiple purchase discounts available

Limited to 16 stones: 1 Montana sapphire loose stone (including teal blue and bicolor) Multiple purchase discounts available
Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Intense Pink) 1 stone loose (multiple purchase discount available)

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Intense Pink) 1 stone loose (multiple purchase discount available)
Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Vivid Pink) 1 stone loose (multiple purchase discount available)

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Vivid Pink) 1 stone loose (multiple purchase discount available)
Sold out Diamond gacha💎Fancy cut brown diamonds and FancyDarkBrown diamonds (with medium treasure chest)《Multiple purchase discount available》

Diamond gacha💎Fancy cut brown diamonds and FancyDarkBrown diamonds (with medium treasure chest)《Multiple purchase discount available》

Sold out 1 rose cut diamond (VS-SI class equivalent, 3.0mm)《Multiple purchase discount available》

1 rose cut diamond (VS-SI class equivalent, 3.0mm)《Multiple purchase discount available》

Sold out バロックオパール 2石 - KARATZ STORE｜カラッツSTORE

Baroque Opal 2 stones《Discount available for multiple purchases》

Sold out [On Sale 10/13 at 10 PM] [Limited to 10 Stones] Bicolor Gacha 💎 Includes two Zimbabwean euclase stones (average 0.088 carats), a 1.03 carat bicolor sapphire, a bicolor chrysoberyl, and more. [Multiple purchase discounts available]

[On Sale 10/13 at 10 PM] [Limited to 10 Stones] Bicolor Gacha 💎 Includes two Zimbabwean euclase stones (average 0.088 carats), a 1.03 carat bicolor sapphire, a bicolor chrysoberyl, and more. [Multiple purchase discounts available]
Sold out Mini Kite Cut Loose Stone (Includes 2 Paraiba Tourmalines, Green Beryl, Ruby, Peridot, etc.) {Multiple Purchase Discounts Available}

Mini Kite Cut Loose Stone (Includes 2 Paraiba Tourmalines, Green Beryl, Ruby, Peridot, etc.) {Multiple Purchase Discounts Available}

Sold out Gem Gacha💎1 special fluorescent diamond (VS-SI class equivalent, 2.0mm)

Gem Gacha💎1 special fluorescent diamond (VS-SI class equivalent, 2.0mm)

Sold out [Available at 10/17 10 PM] Limited Stock! Color-Change Gacha! 💎 Burmese Color-Change Zircon, Color-Shift Sapphire, Color-Shift Cobalt Spinel, and More! Discounts Available for Multiple Purchases!

[Available at 10/17 10 PM] Limited Stock! Color-Change Gacha! 💎 Burmese Color-Change Zircon, Color-Shift Sapphire, Color-Shift Cobalt Spinel, and More! Discounts Available for Multiple Purchases!
Sold out Greenland Ruby Loose (approx. 2.3mm, Top Color, Certificate Included) (Multiple Purchase Discounts Available)

Greenland Ruby Loose (approx. 2.3mm, Top Color, Certificate Included) (Multiple Purchase Discounts Available)

Sold out Limited to 7 stones! May birthstone special offer! Colombian emerald cat's eye, 1 loose stone (highly transparent cat's eye) Multiple purchase discounts available

Limited to 7 stones! May birthstone special offer! Colombian emerald cat's eye, 1 loose stone (highly transparent cat's eye) Multiple purchase discounts available
Sold out [Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]

[Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]
Sold out Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available

Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available
Sold out Limited to 9 stones: 1 London Blue Diamond Loose (VS-SI class equivalent, 2.0mm) Multiple purchase discounts available

Limited to 9 stones: 1 London Blue Diamond Loose (VS-SI class equivalent, 2.0mm) Multiple purchase discounts available
Sold out Limited to 7 stones: 1 loose kyanite stone from Nepal (royal blue color, 4mm, round cut) Multiple purchase discounts available

Limited to 7 stones: 1 loose kyanite stone from Nepal (royal blue color, 4mm, round cut) Multiple purchase discounts available
Sold out Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》

Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》

Sold out [Sold at 10 PM on September 5th] Single loose Russian oil-free emerald (2.2mm, round cut) {Multiple purchase discounts available}

[Sold at 10 PM on September 5th] Single loose Russian oil-free emerald (2.2mm, round cut) {Multiple purchase discounts available}

Sold out One loose, oil-free emerald from Russia (2.8mm, round cut) (Multiple purchase discounts available)

One loose, oil-free emerald from Russia (2.8mm, round cut) (Multiple purchase discounts available)
Sold out [On Sale 10/13 at 10 PM] [Limited to 6 stones] One loose, oil-free emerald from Russia (3.2mm, round cut) [Multiple purchase discounts available]

[On Sale 10/13 at 10 PM] [Limited to 6 stones] One loose, oil-free emerald from Russia (3.2mm, round cut) [Multiple purchase discounts available]
Sold out グリーンランド産アイスルビー 1石（ハートシェイプ,4mm）

Ice ruby ​​from Greenland 1 stone (heart shape, 4mm) Comes with original pouch

Sold out Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available

Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available
Sold out オーストラリア産ボルダーオパール 52.582ctルース

Australian boulder opal 52.582ct loose

Sold out 【ダンデライオンカット】メキシコ産ファイアオパール 7mm《コラボ》ルース ワッペン付

[Dandelion cut] Fire opal 7mm loose

Sold out 【カラフリ】K18レピドクロサイトインクォーツ2.37ct・ダイヤモンドリング - カラッツSTORE

[Colorful] K18 lepidocrocite in quartz 2.37ct diamond ring

Sold out 【宝石商の道具】加熱処理のエチオピア産オパール 1石（ブラックオパールとの見分けシート付） - カラッツSTORE

1 heat-treated Ethiopian opal (includes a sheet to distinguish it from black opal)

Sold out Lottery Sale 3 [Reserved for Winners] [Published 32501705] Blue Diamond 2.3mm/0.056ct Loose (Light Green Blue, SI-1)

Lottery Sale 3 [Reserved for Winners] [Published 32501705] Blue Diamond 2.3mm/0.056ct Loose (Light Green Blue, SI-1)

Sold out Lottery Sale ⑤ [Reserved for Winners] [Published on 32501841] White Diamond 6.2mm/0.988ct Loose (Fancy White, I2)

Lottery Sale ⑤ [Reserved for Winners] [Published on 32501841] White Diamond 6.2mm/0.988ct Loose (Fancy White, I2)

Sold out Lottery Sale 4 [Reserved for Winners] [Listed on 32501584] 0.127ct Gray Diamond Loose (Fancy Yellowish Gray, SI1)

Lottery Sale 4 [Reserved for Winners] [Listed on 32501584] 0.127ct Gray Diamond Loose (Fancy Yellowish Gray, SI1)

Sold out ピンクオパール 7.180ctルース

Pink opal 7.180ct loose
Sold out ペルー産バイカラーブルーオパール 0.492ctルース

Peruvian bicolor blue opal 0.492ct loose stone

Sold out ピジョンブラッドルビー 3.7mm/0.230ctルース AIGS

[10/12 22:00 Sale] Pigeon Blood Ruby 3.7mm/0.230ct Loose Stone AIGS

Sold out インターナリーダイヤモンド 0.25ルース(E, IF, 3Excellent) GIA

[On Sale at 10 PM on October 11th] Internal Diamond 4.1mm/0.250ct Loose (F, IF, 3 Excellent) GIA
Sold out Pt950 バイカラーサファイア 0.398ct リング

Pt950 Madagascar Color Change Sapphire (Bicolor Sapphire) 0.398ct Ring

Sold out K18YG カメレオンダイヤモンド 0.142ct リング

18K Yellow Gold Chameleon Diamond 3.2mm/0.142ct Ring (SI-2, Fancy Brownish Greenish Yellow)

Sold out 【12548175掲載】コロンビア産ノンオイルエメラルド 0.110ctルース

[Posted 12548175] Colombian oil-free emerald 0.110ct loose

Sold out オーストラリア産ボルダーオパール 0.721ctルース

Australian boulder opal 0.721ct loose
Sold out タンザニア産バイカラーサファイア 0.955ctルース

[10/12 22:00 Sale] Tanzanian Bicolor Sapphire 0.955ct Loose

Sold out マダガスカル産ブルーサファイア 0.338ctルース

[10/11 22:00 Sale] Madagascar Blue Sapphire 0.338ct Loose
Sold out パープルダイヤモンド（トリートメント） 2.6mm/0.088ctルース（バイカラー蛍光）

[On Sale 10/11 at 10 PM] Purple Diamond (Treated) 2.6mm/0.088ct Loose (Bicolor Fluorescent)
Sold out ダイヤモンド（H&C） 3.8mm/0.208ctルース(G, IF, 3Excellent H&C)

Lottery Sale ① [Reserved for Winners] [Listed on 32501711] Internally Flawless Diamond (H&C) 3.8mm/0.208ct Loose (G, IF, 3 Excellent H&C) by Chuho

Sold out 【12541077掲載】エメラルド 67.796ct原石

[On sale at 10pm on August 7th] 67.796ct rough emerald
Sold out 非加熱ブルーサファイア 1.685ctルース

[Published in 12539647] Unheated blue sapphire 1.685ct loose

Sold out ブルーサファイア 0.244ctルース

[On Sale at 10 PM on September 17th] 0.244ct Loose Blue Sapphire from Madagascar

Sold out エメラルド 0.111ctルース

Emerald 0.111ct loose
Sold out 非加熱ピジョンブラッドルビー 0.300ctルース AIGS

Unheated Pigeon Blood Ruby 0.300ct Loose

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's Initiatives and Social Contributions

We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.

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.