Birthstone list

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【12534192掲載】非加熱コーンフラワーブルーサファイア 0.460ctルース

Unheated cornflower blue sapphire 0.460ct loose AIGS

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Pigeon blood ruby 0.40ct loose AIGS

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Padparadscha sapphire 0.676ct loose medium treasure book

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Star garnet 11.460ct loose (6 rows)

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Black diamond 3.7mm/0.200ct loose (rose cut)

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Salt and Pepper Diamond 0.695ct Loose (Garnet in Diamond) Japanese-German Edition

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ブラジル産パライバトルマリン 0.149ctルース（CuO:2.9%、MnO:2.5%）

Brazilian Paraiba tourmaline 0.149ct loose (CuO:2.9%, MnO:2.5%)

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Pt900/Pt850パライバトルマリン0.43ct ペンダント（CuO:0.2%,MnO:1.9%) - カラッツSTORE

[Colorful] Pt900/Pt850 Paraiba tourmaline 0.43ct pendant (CuO:0.2%,MnO:1.9%)

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ブラジル産パライバトルマリン 0.173ctルース（CuO:1.9%、MnO:2.2%）

Paraiba tourmaline from Brazil 0.243ct loose (CuO:1.9%, MnO:2.2%)

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【9/22(水)AM10時〆：抽選販売_11】インターナリーフローレスダイヤモンド 3.7mm/0.238ctルース(E, IF) Sale price¥59,800

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Limited to 2 stones: 1 Brazilian Madeira citrine loose stone (round cut, 5.5mm) Multiple purchase discounts available Sale price¥3,980

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【Posted on 12562262】Brazilian Santa Maria Aquamarine 0.361ct Loose Stone

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[Lottery Sale 0829] Blue Diamond 0.064ct Loose Stone (FANCY LIGHT GREEN BLUE, VS-1) Sale price¥298,000

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

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[Lottery Sale 0531_09] Nigerian Mint Green Tourmaline 1.319ct Loose Stone with Certificate Sale price¥55,800

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

Loose Yellow Diamond, 0.262ct (LIGHT YELLOW, VS1, Princess Cut)

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Madagascar padparadscha sapphire 3.3mm/0.156ct loose stone (with CGL certificate)

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Brazilian copper rutilated quartz 2.101ct loose stone

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Brazilian copper rutilated quartz 1.465ct loose stone

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Padparadscha Sapphire 3.9mm/0.282ct Loose DGL

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【#202607 Akihabara Pop-up Exhibition Item】【12562563 Posted】Montana Sapphire 0.541ct Loose Stone Sale price¥98,000

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イエローダイヤモンド（トリートメント） 0.190ctルース(FANCY INTENSE YELLOW*, SI-2)

Loose Yellow Diamond (Treated) 0.190ct (FANCY INTENSE YELLOW, SI-2)

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2.863ct Loose Nepali Kyanite (Royal Blue Color)

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Madagascar Paparadscha Sapphire 3.9mm/0.282ct Loose Stone DGL Certified

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Madagascar Padparadscha Sapphire 3.9mm/0.336ct Loose DGL Certified

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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） 1.087ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 6.1mm/1.087ct loose stone

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Brazilian Paraiba Tourmaline 0.056ct Loose Stone (CuO:2.1%, MnO:2.2%)

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Brazilian Seafoam Tourmaline 4.2mm/0.319ct Loose

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Brazilian Paraiba Tourmaline 0.046ct Loose Stone (CuO:1.7%, MnO:2.5%)

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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） 3.251ctルース

Andesine Labradorite (also known as Rainbow Moonstone) 7.7mm/3.251ct Loose Stone (Sphere)

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《Limited to 3 Stones》Brazilian Paraiba Tourmaline (Cabochon Cut approx. 3.0mm) 1 Loose Stone《Multi-Purchase Discount Available》

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[COLORFUL] Pt900 Opal 2.61ct, Diamond 0.858ct Ring

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Unheated Imperial Topaz (Sherry Color) from Brazil, 0.351ct Loose Stone

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Almandine Garnet 1.255ct Loose Stone

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Brazilian bi-color tourmaline, 1.050 ct loose stone

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[Lottery Sale 0531_14] Greenland Sapphire 1.258 ct Loose Stone with ChuBo & Analysis Data Sale price¥59,800

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ブラジル産パライバトルマリン 0.49ctルース - KARATZ STORE｜カラッツSTORE

0.49ct loose Brazilian Paraiba Tourmaline (CuO:0.6%, Mn:0.1%)

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Parasitic Peridot 0.220ct Loose Stone with Certificate

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Bekily Blue Garnet from Madagascar (color change garnet) 0.089ct loose

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【12562641掲載】マラウイ産ムーンストーン（マラウイムーンストーン） 4.198ctルース

Malawi Moonstone 4.198ct Loose Stone

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【32501858掲載】グレーダイヤモンド 0.141ctルース(FANCY GRAY, I-1)

Loose Gray Diamond 0.141ct (FANCY GRAY, I-1)

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Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)

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Australian black opal 0.588ct loose

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[Clover in cut] Emerald 9mm/2.498ct {Collaboration} Loose with patch

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[Koshu precious stone cutter pluethree] Colombian emerald 2.018ct loose

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Montana Sapphire 0.561ct loose (bicolor sapphire)

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.