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Sold out 2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)

2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)
Sold out 2.393ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)

2.393ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)
Sold out Synthetic Opal 0.856ct Loose (Synthetic Water Opal)

Synthetic Opal 0.856ct Loose (Synthetic Water Opal)

Sold out Synthetic Alexandrite 2.046ct Loose

Synthetic Alexandrite 2.046ct Loose
Sold out [Yukinko Cut] Synthetic Sapphire 2.102ct Loose Stone

[Yukinko Cut] Synthetic Sapphire 2.102ct Loose Stone

Sold out [Sakura InCut] Synthetic Sapphire 2.610ct Loose Stone (Synthetic Pink Sapphire)

[Sakura InCut] Synthetic Sapphire 2.610ct Loose Stone (Synthetic Pink Sapphire)

Sold out Synthetic Blue Sapphire 0.886ct Loose (Synthetic Sapphire)

Synthetic Blue Sapphire 0.886ct Loose (Synthetic Sapphire)
Sold out 合成モアッサナイト 0.970ctルース

Synthetic Moissanite 0.970ct Loose Stone (Blue Moissanite)
Sold out 【ゆきんこカット】合成サファイア 2.220ctルース（合成ブルーサファイア）

[Yukinko Cut] Synthetic Sapphire 2.220ct Loose (Synthetic Blue Sapphire)
Sold out [Sakura Shape] Synthetic Sapphire 3.285ct Loose Stone

[Sakura Shape] Synthetic Sapphire 3.285ct Loose Stone
Sold out 合成サファイア 2.348ctルース

【On Sale May 21st, 10 PM JST】Synthetic Sapphire 2.348 ct Loose Stone
Sold out 合成アレキサンドライト 0.228ctルース

[On sale May 21st, 10 PM JST] Synthetic Alexandrite 0.228ct Loose Stone
Sold out 合成アレキサンドライト 0.557ctルース

【Sales from 10 PM on May 17th】Synthetic Alexandrite 0.557ct Loose Stone
Sold out 合成アレキサンドライト 1.355ctルース

[On sale May 15th at 10 PM] Synthetic Alexandrite 1.355ct Loose Stone
Sold out 合成アレキサンドライト 1.355ctルース

[On sale 10 PM, May 15th] Synthetic Alexandrite Loose Stone, 1.355 ct
Sold out K18 合成ルビー ペンダントトップ（ネックレストップ）

[On sale May 30th at 10 PM] [Colorfri] K18 Synthetic Ruby / Synthetic Spinel Pendant Top (Necklace Top) with Certificate of Authenticity
Sold out Pt900 合成アレキサンドライト 1.08ctct ペンダントトップ（ネックレストップ） 鑑別書

[Sale starts 6/18 at 10 PM] Colorful Pt900 Synthetic Alexandrite 1.08ct Diamond 0.06ct Pendant Top (Necklace Top) with Appraisal Certificate
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 合成アレキサンドライト 0.471ctルース

Synthetic Alexandrite 0.471ct loose stone
Sold out 合成アレキサンドライト 1.680ctルース

Synthetic alexandrite 1.680ct loose

Sold out 合成サファイア 10.411ctルース

Synthetic sapphire 10.411ct loose stone

Sold out ラボグロウンダイヤモンド（合成ダイヤモンド） 0.730ctルース(D, IF, IDEAL)

Lab-grown Diamond (Synthetic Diamond) 0.730ct Loose (D, IF, IDEAL)

Sold out 【12555991掲載】合成オパール 0.723ctルース

Synthetic Opal (Synthetic Black Opal) 0.723ct Loose Stone

Sold out 合成モアッサナイト 0.672ctルース

Synthetic Moissanite 6.0mm/0.672ct Loose Stone
Sold out 合成ブラックオパール 1.348ctルース

Synthetic Black Opal 7.5mm/1.348ct Loose
Sold out 合成オパール 1.447ctルース

Synthetic Opal 1.447ct Loose
Sold out 【甲州貴石切子plusthree】合成モアッサナイト 13.0mm/7.179ctルース

[Koshu Precious Stones Plusthree] Synthetic Moissanite 13.0mm/7.179ct Loose Stone

Sold out 合成アレキサンドライト 0.491ctルース

Synthetic Alexandrite 0.491ct loose stone (princess cut)

Sold out 【甲州貴石切子plusthree】合成モアッサナイト 5.570ct《コラボ》ルース ワッペン付

[Koshu Precious Stones Plusthree] Synthetic Moissanite 12mm/5.570ct Loose Patch
Sold out 【甲州貴石切子pluesthree】合成モアッサナイト 《コラボ》4.02ctルース ワッペン付

[Koshu Precious Stones Plusthree] Synthetic Moissanite 10mm/4.02ct Loose Patch
Sold out 合成アレキサンドライト 0.460ctルース

Synthetic Alexandrite 0.460ct loose stone
Sold out 合成オパール 1.157ctルース

Synthetic Opal 1.157ct Loose

Sold out 【甲州貴石切子plusthree】合成モアッサナイト 8mm/1.502ct《コラボ》ルース ワッペン付

[Koshu precious stone Kiriko plusthree] Synthetic moissanite 8mm/1.502ct《Collaboration》 Loose with patch
Sold out 合成モアッサナイト 0.748ctルース

Synthetic moissanite 6mm/0.748ct loose (star cut)

Sold out 合成アレキサンドライト 1.320ctルース

[On sale 5/22 at 10 PM] Synthetic Alexandrite 1.320ct Loose Gemstone
Sold out 合成アレキサンドライト 0.663ctルース

[On sale May 17th at 10 PM] Synthetic Alexandrite 5.1mm/0.663ct Loose Gemstone
Sold out 合成オパール 1.804ctルース

Synthetic Opal 1.804ct Loose
coming soon 【Sakura Shape】Synthetic Sapphire 8.8mm/3.631ct Loose Stone

【Sakura Shape】Synthetic Sapphire 8.8mm/3.631ct Loose Stone Sale price¥39,800
coming soon [On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*

[On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available* Sale price¥45,800
coming soon 合成アレキサンドライト 1.409ctルース

[#202607 Akihabara Pop-up Store - Currently Removed] [Shinjuku Marui Annex 202605 - Currently Removed] [12559525 Listed] Synthetic Alexandrite 1.409ct Loose Stone Sale price¥39,800

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.