Birthstone list

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Australian Black Opal 0.877ct Loose

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Loose Colombian emerald, 0.135 ct, Hōki Kyō (Japan Gem Laboratory)

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【さくらインカット】コンゴ産ピンクトルマリン 6.6mm/0.819ctルース鑑別書

[Sakura Incut] Congolese Pink Tourmaline 6.6mm/0.819ct Loose with Certificate

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Pt900ブラックオパール 3.17ct・ダイヤモンド0.105ctペンダントトップ（ネックレストップ）鑑別書

[Listed in 22602653] [Colorflee] Black Opal 3.17ct Pendant Top (Necklace Top)

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Pt900 ブルーサファイア 0.52ct・ダイヤモンド0.19ctペンダントトップ（ネックレストップ）鑑別書

[22602649 Published] [Colorful] Pt900 Blue Sapphire 0.52ct Pendant Top (Necklace Top)

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[Lottery Sale_0612_08] Unheated Purple Sapphire 0.775ct Loose Gemstone - Houseki Kyo

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《Limited to 1 set》11 Stone Treated Diamond Set (approx. 1.2mm x 11 stones) 《Bulk Purchase Discount Available》

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Diamond 3.7mm/0.197ct Loose (K, VS-2, VeryGood)

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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

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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）

[Karafuru] Pt900 Emerald 0.30ct / Diamond 0.01ct Pendant Top

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Brazilian Paraiba Tourmaline 2.6mm/0.056ct Loose Gemstone (CuO:1.9% MnO:0.6%)

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Burmese ruby 3.1mm/0.120ct loose stone with gemological report

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0.300 ct Loose Mozambique Ruby with Certificate

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Kashmir unheated sapphire 0.350ct loose stone GIA

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Sri Lankan Blue Sapphire 4.0mm/0.269ct Loose with Certificate

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Tanzanian Windsor Sapphire (Brown Sapphire) 1.137ct Loose Stone with Gemstone Identification Report

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0.415ct Mozambique Ruby Loose Stone with Gemstone Identification Report

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Madagascar Padparadscha Sapphire 3.5mm/0.206ct Loose, Central Gem Laboratory

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[On sale 8/3 at 10 PM] Malawi Moonstone 1.747ct Loose Gemstone

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K18 ペリステライト 0.66ct・ダイヤモンドペンダントトップ（ネックレストップ）鑑別書

[22602614 Listed] [Calafli] K18 Peristerite 0.66ct Pendant Top (Necklace Top)

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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

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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

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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

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Brazilian Green Tourmaline 0.825ct Loose Stone

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Limited to 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases.

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Tanzanite 0.760ct loose stone (sugarloaf cut)

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0.221ct Loose Padparadscha Sapphire from Madagascar, accompanied by a Central Gem Laboratory certificate

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Brazilian Bi-color Paraiba Tourmaline 0.190ct Loose (CuO: 2.06% MnO: 1.31%) with Japan-Germany Gemological Analysis Report

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K18WG グリーンクォーツ・ダイヤモンド0.02ctペンダントトップ（ネックレストップ）

【CARAFUL】K18WG Green Quartz and Diamond 0.02ct Pendant Top

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K14WG ブラックダイヤモンド 0.89ct ペンダントトップ（ネックレストップ）

[Calafuri] K14WG Black Diamond 0.89ct, Diamond 0.13ct Pendant Top (Necklace Top) with Appraisal Report

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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） 0.582ctルース

0.582ct Loose Andesine-Labradorite from Madagascar (Common Name: Rainbow Moonstone)

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Diamond 3.4mm/0.144ct Loose (I, VS1, Good)

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[Colorful] K18 Ametrine Cat Motif Pendant Top (Necklace Top) with Appraisal Report

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K18PG 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）ペンダントトップ（ネックレストップ）鑑別書

[Colorfli] K18PG Andesine and Labradorite (Commonly known as Rainbow Moonstone) Pendant Top (Necklace Top) with Appraisal Report

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[Calafuri] K18 Ruby 0.44ct, Diamond 0.18ct Ring with Appraisal Certificate

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Bolivian Ametrine 16.867ct loose stone

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Almandine Garnet 0.660ct Loose

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Brazilian Amethyst 9.749ct Loose Stone

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Pt950 Brazilian Paraiba Tourmaline 0.043ct/Diamond 0.013ct Ring (CuO: 1.6%, MnO: 2.3%)

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K18/Pt950 ブラジル産パライバトルマリン 0.064ct ペンダントトップ（ネックレストップ）

K18/Pt950 Brazilian Paraiba Tourmaline 0.064ct and Diamond 0.006ct Pendant Top (CuO:1.8%, MnO:2.1%)

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グリーンダイヤモンド（トリートメント） 0.183ctルース(FANCY INTENSE YELLOW GREEN TREATED, VS1)

Apple Green Diamond (Treated) 3.6mm/0.183ct Loose Stone (FANCY INTENSE YELLOW GREEN TREATED, VS1)

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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） 0.610ctルース

Madagascar Andesine-Labradorite (commonly known as Rainbow Moonstone) 5.0mm/0.610ct Loose Stone

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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） 0.640ctルース

Loose 0.640 ct Madagascan Andesine-Labradorite (commonly known as Rainbow Moonstone)

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Rough Russian Diamonds (Sawables) 0.098ct Rough Diamonds (Trigons)

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Unheated Brazilian Paraiba Tourmaline 0.088ct loose stone (CuO: 1.9%, MnO: 2.3%)

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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.