All

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Cristobalite in Quartz 1.660ct Loose

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Brazilian Flower Quartz 6.501ct Loose Stone

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Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)

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Paraiba tourmaline from Mozambique 1.581ct loose stone (CuO: 0.5%, MnO: 1.0%)

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2.503 ct Loose Emerald with Pyrite from Colombia

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Loose Columbian Pyrite in Emerald 3.346 ct

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Madagascar Bekiri Blue Garnet (Color Change Garnet) 0.254ct Loose Stone

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Madagascar Bekily Blue Garnet (Color Change Garnet) 0.221ct Loose Stone

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【12562769掲載】ブラジル産マイカインローズクォーツ（雲母インローズクォーツ） 3.123ctルース

Brazilian Mica in Rose Quartz (Muscovite in Rose Quartz) 3.123ct Loose

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Brazilian Swiss Blue Topaz 1.198ct Loose

coming soon

[Lottery Sale 0521_01] Uncut Tanzanian Alexandrite 0.843ct Sale price¥29,800

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[On sale May 6, 10 PM] Afghan Hauyne 0.437 ct Loose Gemstone, Chuo鑑定済

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【12562779掲載】ブラジル産デンドリティックアゲート 12.309ctルース

[On sale May 2, 10 PM] Brazilian Dendritic Agate 12.309ct Loose Stone

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[Sale starts 10 PM JST on 5/14] Colombian Emerald 1.571ct Loose Stone Pendant Top

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[On sale 5/5 at 22:00] Colombian Emerald 4.7mm/0.468ct Loose Stone

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【12562785掲載】コロンビア産エメラルドキャッツアイ 0.574ctルース

【On sale May 2nd, 10 PM JST】Colombian Emerald Cat's Eye 0.574ct Loose Stone

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Untreated Vietnamese Star Ruby 1.696ct Loose Stone with Certification

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[On sale May 14th at 10 PM] [Colorfri] K18PG Morganite and 0.04ct Diamond Pendant Top (Necklace Top) with Appraisal Report

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【22602585掲載】【カラフリ】K18PG スピネル 0.48ct ペンダントトップ（ネックレストップ）

[On sale May 3rd, 10 PM JST] [Colorfury] K18PG Pink Spinel 0.48ct Pendant Top (Necklace Top) with Identification Card

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[Shipping and public settings notice] Bracelet processing fee for Mochizuki template [For Mr.]

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Tanzanian Kornerupine 0.700ct Loose Stone

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[Sales start May 2, 10 PM] K18 Tanzanite Chain Ring

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[On sale May 2nd at 10 PM] K18 Blue Sapphire Ring

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[On sale May 2nd at 10 PM] K18 Citrine Chain Ring

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Brazilian Paraiba Tourmaline 0.177ct loose stone (CuO: 2.1%, MnO: 1.3%)

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マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 1.003ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 1.003ct loose stone

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【32501905掲載】ブルーダイヤモンド（トリートメント） 0.801ctルース(FANCY INTENSE GREEN BLUE, SI-2)

[Lottery Sale 0521_09] Sky Blue Diamond (Treated) 0.801ct Loose (FANCY INTENSE GREEN BLUE, SI-2) with certificate

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Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)

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Diamond 4.3mm/0.310ct Loose (E, VS1, 3Excellent) GIA

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インターナリーフローレスダイヤモンド（H&C） 0.300ctルース(D, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 4.3mm/0.300ct Loose (D, IF, 3Excellent H&C) GIA&CGL

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ダイヤモンド（H&C） 0.200ctルース(D, VVS-2, 3Excellent H&C)

Diamond (H&C) 3.8mm/0.200ct Loose (D, VVS-2, 3Excellent H&C) CBT

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ダイヤモンド 3.0mm/0.101ctルース(D, VVS-2, VeryGood)

Diamond 3.0mm/0.101ct Loose Stone (D, VVS-2, VeryGood)

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Yellow sapphire from Sri Lanka 0.736ct loose

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Yellow sapphire from Sri Lanka 0.645ct loose

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Yellow sapphire from Sri Lanka 0.626ct loose

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Sri Lankan Yellow Sapphire 0.941ct Loose

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Yellow sapphire from Sri Lanka 0.705ct loose

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Sri Lankan Yellow Sapphire 0.678ct Loose

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Yellow sapphire from Sri Lanka 0.711ct loose

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Twin chrysoberyl cat's eye 0.591ct loose

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Twin star sapphire from Sri Lanka 2.539ct loose

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Twin star sapphire from Sri Lanka 2.955ct loose (black star sapphire)

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Brazilian Santa Maria Aquamarine 0.172ct loose

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Pakistani oil-in quartz 0.427ct loose (type with moving bubbles)

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【スターインカット】ティンカーベルクォーツ（ピンクファイヤークォーツ） 6mm/0.546ctルース

[Star in cut] Tinkerbell quartz (pink fire quartz) 6mm/0.546ct loose

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Mexican Fire Opal 0.102ct Loose (Faceted Cut)

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.