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Sold out コロンビア産エメラルド 2.018ctルース

[Koshu precious stone cutter pluethree] Colombian emerald 2.018ct loose
Sold out エメラルド 2.498ctルース

[Clover in cut] Emerald 9mm/2.498ct {Collaboration} Loose with patch
Sold out オーストラリア産レインボーラティスサンストーン 0.353ctルース

Australian rainbow lattice sunstone 0.353ct loose
Sold out YAG（イットリウムアルミニウムガーネット） 1.927ctルース

YAG (Yttrium Aluminum Garnet) 7.1mm/1.927ct Loose Stone by Nikkei Kan
Sold out Blue Garnite from Nigeria 0.514ct Ruth Japanese-German Edition

Blue Garnite from Nigeria 0.514ct Ruth Japanese-German Edition
Sold out ブラジル産クォーツインクォーツ 14.298ctルース

Brazilian Quartz in Quartz 14.298ct Loose Stone
Sold out 《Tucson Arrivals - Limited to 4 Stones》Canadian Eudialyte, approx. 2.5mm《Multiple Purchase Discount Available》

《Tucson Arrivals - Limited to 4 Stones》Canadian Eudialyte, approx. 2.5mm《Multiple Purchase Discount Available》
Sold out [Limited to 10 stones] Brazilian Scolite (average 3ct) [Multi-buy discount available]

[Limited to 10 stones] Brazilian Scolite (average 3ct) [Multi-buy discount available]
Sold out Brazilian Bicolor Blue Topaz 1.317ct Loose Stone (Untreated)

Brazilian Bicolor Blue Topaz 1.317ct Loose Stone (Untreated)
Sold out オーストラリア産ブラックオパール 3.871ctルース

Australian black opal, 3.871 ct, loose
Sold out 【12562530掲載】オーストラリア産ブラックオパール 0.784ctルース

Australian Black Opal 0.784ct Loose
Sold out 【12562533掲載】オーストラリア産ブラックオパール 0.427ctルース

Australian Black Opal 0.427ct Loose Stone
Sold out オーストラリア産ブラックオパール 0.588ctルース

[On sale May 3rd at 10 PM] Australian Black Opal 0.588ct Loose Stone
Sold out Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)

Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)
Sold out ブラジル産メデューサクォーツ（パライバクォーツ） 1.132ctルース

Brazilian Medusa Quartz (Paraiba Quartz) 1.132ct Loose Stone
Sold out ブラジル産メデューサクォーツ（パライバクォーツ） 3.122ctルース

Brazilian Medusa Quartz (Paraiba Quartz) 3.122ct Loose Stone
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 モスアゲート 0.795ctルース

Moss agate 0.795ct loose stone
Sold out メデューサクォーツ（パライバクォーツ） 1.975ctルース

Brazilian Medusa Quartz (Paraiba Quartz) 1.975ct Loose Stone
Sold out タンザナイト 0.580ctルース

Tanzanite 5mm/0.580ct loose stone (sugarloaf cut)
Sold out ベトナム産非加熱シルキーピンクサファイア 0.178ctルース

Vietnam unheated silky pink sapphire 0.178ct loose stone
Sold out Limited 5 Stones: Synthetic Alexandrite Gacha (Princess Cut, 3.5-4.5mm) (Multi-Buy Discount Available)

Limited 5 Stones: Synthetic Alexandrite Gacha (Princess Cut, 3.5-4.5mm) (Multi-Buy Discount Available)
Sold out 【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)
Sold out Colombian No-Oil Emerald 0.120ct Loose Stone GIA

Colombian No-Oil Emerald 0.120ct Loose Stone GIA
Sold out Green tourmaline 2.144ct loose

Green tourmaline 2.144ct loose
coming soon ピンクサファリン 0.239ctルース

0.239ct Loose Pink Sapphire from Madagascar, Japan/Germany Sale price¥49,800
coming soon Bulgarian Sphalerite 5.8mm/1.058ct Loose Stone

Bulgarian Sphalerite 5.8mm/1.058ct Loose Stone Sale price¥39,800
Sold out 【12548841掲載】スリランカ産イエローサファイア 0.835ctルース

Sri Lankan Yellow Sapphire 0.835ct Loose
Sold out 【12558576掲載】パキスタン産ヴェイリネナイト 0.150ctルース

Pakistan Veininite 0.150ct Loose Gemstone with Certificate
Sold out オーストラリア産レインボーラティスサンストーン 0.865ctルース

Australian Rainbow Lattice Sunstone 0.865ct Loose
Sold out Myanmar Leuco Garnet 0.324ct loose stone

Myanmar Leuco Garnet 0.324ct loose stone
Sold out Diamond 0.320ct loose (D, VS2)

Diamond 0.320ct loose (D, VS2)
Sold out Malawi Moonstone 2.447ct Loose Stone

Malawi Moonstone 2.447ct Loose Stone
Sold out Big Gem Gacha 💎 including Dandelion Cut 15mm and Camellia Cut 19mm, normally 55,800 JPY《Multiple Purchase Discount Available》

Big Gem Gacha 💎 including Dandelion Cut 15mm and Camellia Cut 19mm, normally 55,800 JPY《Multiple Purchase Discount Available》
Sold out [12560354] Zimbabwean Bicolor Euclase 0.206ct Loose Stone

[12560354] Zimbabwean Bicolor Euclase 0.206ct Loose Stone
Sold out ロシア産デマントイドガーネット（ホーステール認む） 0.265ctルース

Russian Demantoid Garnet (Horsetail) 3.8mm/0.265ct Loose Stone
Sold out デュモルチェライトインクォーツ 5.830ctルース

[12561482] Dumortierite in Quartz 5.830ct Loose Stone
Sold out 高知県産血赤珊瑚 6.351ctルース

Kochi Prefecture oxblood coral 6.351ct loose
Sold out マダガスカル産アイオライトサンストーン 0.311ctルース

Madagascar Iolite Sunstone 0.311ct Loose
Sold out ケニア産バイカラーグロッシュラーガーネット 0.479ctルース

Kenya Bi-color Grossular Garnet (Bi-color Tsavorite) 0.479ct Loose Stone
Sold out 【12562505掲載】モザンビーク産アクアマリン 0.888ctルース

0.888ct Loose Mozambique Aquamarine
Sold out 【12562506掲載】スリランカ産非加熱スターサファイア 1.016ctルース

Sri Lankan Unheated Star Sapphire 1.016ct Loose Gemstone
Sold out スリランカ産非加熱スターサファイア 0.758ctルース

【On sale 5/6 at 10 PM JST】Unheated Sri Lankan Star Sapphire 0.758ct Loose Gemstone
Sold out 【12562512掲載】スリランカ産非加熱スターサファイア 0.692ctルース

Unheated Sri Lankan Star Sapphire Loose Stone 0.692ct
Sold out 【12562517掲載】スリランカ産非加熱スターサファイア 0.450ctルース

Unheated Sri Lankan Star Sapphire 0.450ct Loose Stone
Sold out 《Limited to 15 Stones》Cordierite-Inclusive Cordierite Spinel Gacha, Equivalent to 59,800 Yen 《Bulk Purchase Discount Available》

《Limited to 15 Stones》Cordierite-Inclusive Cordierite Spinel Gacha, Equivalent to 59,800 Yen 《Bulk Purchase Discount Available》
Sold out 《Limited to 15 Stones》Fluorite Gacha including 2 Koshu-Kiseki-Kiriko stones (normally 49,800 yen) with 1 CC fluorite stone as a bonus《Multiple Purchase Discount Available》

《Limited to 15 Stones》Fluorite Gacha including 2 Koshu-Kiseki-Kiriko stones (normally 49,800 yen) with 1 CC fluorite stone as a bonus《Multiple Purchase Discount Available》
Sold out 《Limited to 4 stones》Kochi Prefecture Blood Red Coral Branch (Raw Wood) 1 stone (March birthstone, coral, average 7.2ct) 《Multiple purchase discount available》

《Limited to 4 stones》Kochi Prefecture Blood Red Coral Branch (Raw Wood) 1 stone (March birthstone, coral, average 7.2ct) 《Multiple 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.