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Sold out [On Sale June 28th at 10 PM] Limited to 10 Stones: Brazilian Mint-Color Montebrasite (Princess Cut approx. 3.5mm) - 1 Loose Stone (Volume Discount Available)

[On Sale June 28th at 10 PM] Limited to 10 Stones: Brazilian Mint-Color Montebrasite (Princess Cut approx. 3.5mm) - 1 Loose Stone (Volume Discount Available)
Sold out [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"

[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"
Sold out 【Sale starts 10PM on June 27th】《Limited 8 Stones》Myanmar Black Spinel (B Grade)《Multiple Purchase Discount Available》

【Sale starts 10PM on June 27th】《Limited 8 Stones》Myanmar Black Spinel (B Grade)《Multiple Purchase Discount Available》
Sold out Limited to 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases.

Limited to 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases.
Sold out 合成モアッサナイト 0.682ctルース

Synthetic Moissanite 5.8mm/0.682ct Loose Stone
Sold out スペイン産スファレライト 1.753ctルース

Spanish Sphalerite 7.0mm/1.753ct loose stone
Sold out ブラジル産ルチルレイテッドクォーツ 1.406ctルース

Brazilian rutilated quartz (rutilated quartz) 7.8mm/1.406ct loose stone
Sold out コッパールチルクォーツ 1.465ctルース

Brazilian copper rutilated quartz 1.465ct loose stone
Sold out ブラジル産コッパールチルクォーツ 2.101ctルース

Brazilian copper rutilated quartz 2.101ct loose stone
Sold out 合成アレキサンドライト 0.471ctルース

Synthetic Alexandrite 0.471ct loose stone
Sold out フラワールチルインクォーツ ルース

Brazilian Flower Rutile in Quartz 5.122ct Loose Stone
Sold out フローレスダイヤモンド（H&C） 4.2mm/0.280ctルース(D, FL, 3Excellent H&C) GIA&中宝

【Lottery Sale 0620_09】Flawless Diamond (H&C) 4.2mm/0.280ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL
Sold out フローレスダイヤモンド（H&C） 0.290ctルース(D, FL, 3Excellent H&C)

【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab
Sold out インターナリーフローレスダイヤモンド 0.217ctルース(D, IF, 3Excellent H&C)

[Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA
Sold out マダガスカル産スフェーン 2.323ctルース

Lottery sale: Madagascar Sphene 2.323ct loose stone with鑑別書

Sold out アメリカ産ベニトアイト 0.262ctルース

U.S. Benitoite 0.262ct Loose Gemstone with Certificate
Sold out ベニトアイト 0.129ctルース

Benitoite from the USA, 3.1mm/0.129ct loose stone, with a certificate of authenticity.

Sold out ボリビア産フォスフォフィライト 0.559ctルース

[Lottery Sale 0428_2_13] Bolivian Phosphophyllite 0.559ct Loose Stone with Gemstone Identification Report

Sold out [6/ 10 PM JST release] 《Limited 10 Stones》 Iolite Gacha featuring Koshu-Kiseki-Kiriko plusthree 《Bulk purchase discount available》

[6/ 10 PM JST release] 《Limited 10 Stones》 Iolite Gacha featuring Koshu-Kiseki-Kiriko plusthree 《Bulk purchase discount available》
Sold out [6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》

[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》

Sold out [On Sale June 6th at 10 PM JST] "Limited 13 Stones" Fluorite Gacha including flawed Koshu cut gemstones "Bulk Purchase Discount Available"

[On Sale June 6th at 10 PM JST] "Limited 13 Stones" Fluorite Gacha including flawed Koshu cut gemstones "Bulk Purchase Discount Available"

Sold out パパラチアサファイア 0.206ctルース

[On sale July 5th at 10 PM JST] Madagascar Padparadscha Sapphire 3.5mm/0.206ct Loose Gemstone (with Central Gem Lab certificate)
Sold out モザンビーク産ルビー 0.415ctルース

[On sale July 5th at 10 PM] Mozambique Ruby 0.415ct Loose Stone with Appraisal
Sold out タンザニア産ウィンザーサファイア 1.137ctルース

[On sale July 5th at 10 PM] Tanzanian Windsor Sapphire (Brown Sapphire) 1.137ct Loose Stone with Certificate
Sold out マダガスカル産グランディディエライト 0.086ctルース

[On sale July 5th at 10 PM JST] Madagascar Grandidierite 2.8mm/0.086ct Loose Stone with Certification
Sold out ジンバブエ産ユークレース 0.053ctルース

[On sale July 5th, 10 PM JST] Eudialyte from Zimbabwe, 0.053ct Loose Gemstone with Certificate
Sold out カシミール産非加熱サファイア 0.350ctルース

[Lottery Sale 7][For Winners Only][Posted 12563498] Unheated Kashmir Sapphire 0.350ct Loose GIA

coming soon 【12563499掲載】カシミール産非加熱サファイア 0.400ctルース

[Published as 12563499] Unheated Kashmir Sapphire 0.400ct Loose Stone Sale price¥188,000
Sold out ブラジル産ティンカーベルクォーツ（ピンクファイヤークォーツ） 1.967ctルース

[Sale July 6th at 10 PM] Brazilian Tinker Bell Quartz (Pink Fire Quartz) 1.967ct Loose Stone
Sold out ブラジル産ブラックガーデンクォーツ 3.621ctルース

[On sale July 5th at 10 PM] Brazilian Black Garden Quartz 3.621ct Loose Stone
Sold out ブラジル産デュモルチェライトインクォーツ 1.040ctルース

[Sales start at 10 PM on July 4] Brazilian Dumortierite in Quartz 1.040ct Loose Stone
Sold out ブラジル産デュモルチェライトインクォーツ 1.082ctルース

[On sale July 4th at 10 PM] Brazilian Dumortierite in Quartz 1.082ct Loose Stone
Sold out ブラジル産デュモルチェライトインクォーツ 1.349ctルース

[On sale July 4th at 10 PM] Brazilian Dumortierite in Quartz, 1.349ct Loose Stone
Sold out モザンビーク産ルビー 0.300ctルース

[For sale on July 4th at 10 PM] Mozambique Ruby 0.300ct Loose Stone with Gemstone Report
Sold out ビルマ産ルビー 0.120ctルース

[On sale July 4, 10 PM] Burmese Ruby 3.1mm/0.120ct Loose Stone with Certificate
Sold out ブラジル産パライバトルマリン 0.056ctルース

Paraiba tourmaline from Brazil 0.056ct loose

Sold out Pt900 エメラルド 0.30ct ・ダイヤモンド0.01ctペンダントトップ（ネックレストップ）

[On sale July 16th at 10 PM] [Colorfri] Pt900 Emerald 0.30ct & Diamond 0.01ct Pendant Top
Sold out Pt900/Pt850 カンボジア産ブルージルコン（ラタナキリブルー） 2.45ct ペンダント（ネックレス） 中宝ソ

Pt900/Pt850 Cambodia Blue Zircon (Ratanakiri Blue) 2.45ct/Diamond 0.26ct Pendant (with necklace) Central Gem Lab certified

Sold out イエローダイヤモンド 0.262ctルース(UNDER S(LIGHT YELLOW), VS1)

[#202607 Akihabara Popup Store - Currently Out of Stock] [On Sale July 4th at 10 PM] Yellow Diamond 0.262ct Loose Stone (LIGHT YELLOW, VS1, Princess Cut)
Sold out ダイヤモンド 0.197ctルース(K, VS-2, VeryGood)

[On sale July 4th at 10 PM] Diamond 3.7mm/0.197ct Loose (K, VS-2, VeryGood)
Sold out 《Hong Kong Sourcing》Pakistan Blue Tint Axinite Gacha 1 Stone Loose《Multiple Purchase Discount Available》

《Hong Kong Sourcing》Pakistan Blue Tint Axinite Gacha 1 Stone Loose《Multiple Purchase Discount Available》

coming soon ブラジル産グリーントルマリン 1.319ctルース

[Lottery Sale 0531_09] Nigerian Mint Green Tourmaline 1.319ct Loose Stone with Certificate Sale price¥55,800
Sold out コロンビア産パイライトインエメラルド 2.107ctルース

Lottery Sale 11 [For Winners Only] [Listing 12562752] Colombian Pyrite in Emerald Loose Stone 2.107ct

Sold out ミャンマー産ターフェアイト 0.152ctルース

【Lottery Sale 0409_01】Myanmar Taaffeite 3.3mm/0.152ct Loose Stone with Certificate

Sold out ミャンマー産ターフェアイト 3.0mm/0.128ctルース 鑑別書

[Lottery Sale 0409_04] Burmese Taaffeite 3.0mm/0.128ct Loose Stone with Appraisal

Sold out 《Shinjuku Pop-Up Event Commemorative Offer》《Limited Stock Remaining》 Color Diamond Set (including pink, ice blue, green diamonds, and more, 9 stones or more in total), valued at ¥30,000 normally. 《Multi-Purchase Discount Available》

《Shinjuku Pop-Up Event Commemorative Offer》《Limited Stock Remaining》 Color Diamond Set (including pink, ice blue, green diamonds, and more, 9 stones or more in total), valued at ¥30,000 normally. 《Multi-Purchase Discount Available》

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.