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Sold out 合成アレキサンドライト 0.663ctルース

Synthetic Alexandrite 5.1mm/0.663ct Loose Stone
Sold out 合成アレキサンドライト 1.320ctルース

Synthetic Alexandrite 1.320 ct Loose Stone
Sold out 《Limited to 3 Stones》Brazilian Paraiba Tourmaline (Cabochon Cut approx. 3.0mm) 1 Loose Stone《Multi-Purchase Discount Available》

《Limited to 3 Stones》Brazilian Paraiba Tourmaline (Cabochon Cut approx. 3.0mm) 1 Loose Stone《Multi-Purchase Discount Available》
Sold out ブラジル産非加熱インペリアルトパーズ（シェリーカラー） 0.351ctルース

Unheated Imperial Topaz (Sherry Color) from Brazil, 0.351ct Loose Stone
Sold out ラベンダークォーツ（スコロライト） 1.761ctルース

[Koshu Precious Stones Plusthree] Lavender Quartz (Scorolite) 1.761ct Loose Stone
Sold out 【Sales start April 18th, 10 PM JST】《Limited to 5 pieces》Midway Atoll Coral Branch (Rough), 1 piece (March Birthstone, Coral, average 26ct)《Bulk purchase discount available》

【Sales start April 18th, 10 PM JST】《Limited to 5 pieces》Midway Atoll Coral Branch (Rough), 1 piece (March Birthstone, Coral, average 26ct)《Bulk purchase discount available》
Sold out ドイツ産アウイナイト 0.122ctルース

German Hauyne 0.122ct Loose Gemstone
Sold out 【ダンデライオンカット】モンゴル産カラーチェンジアンデシン 6.0mm/0.774ctルース

[Dandelion Cut] Mongolian Color-Change Andesine 6.0mm/0.774ct Loose Gemstone
Sold out Pt950 アイスブルーダイヤモンド リング

Pt950 Ice Blue Diamond Ring
Sold out マダガスカル産ベキリーブルーガーネット（カラーチェンジガーネット） 0.089ctルース

Bekily Blue Garnet from Madagascar (color change garnet) 0.089ct loose
Sold out 【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
coming soon Bulgarian Sphalerite 5.8mm/1.058ct Loose Stone

Bulgarian Sphalerite 5.8mm/1.058ct Loose Stone Sale price¥39,800
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
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 Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)

Gray Diamond 0.200ct Loose (FANCY DARK GRAY, SI-2)
Sold out オーストラリア産ブラックオパール 0.588ctルース

Australian black opal 0.588ct loose
Sold out Blue Garnite from Nigeria 0.514ct Ruth Japanese-German Edition

Blue Garnite from Nigeria 0.514ct Ruth Japanese-German Edition
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 エメラルド 2.498ctルース

[Clover in cut] Emerald 9mm/2.498ct {Collaboration} Loose with patch
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 Montana Sapphire 0.561ct loose (bicolor sapphire)

Montana Sapphire 0.561ct loose (bicolor sapphire)
Sold out 【12559023掲載】ブラジル産アベンチュリンベリル 0.621ctルース

Brazilian Aventurine Beryl 5.5mm/0.621ct Loose Stone
Sold out Canada Eudialyte 2.5mm/0.059ct Loose Stone with Certificate of Authenticity

Canada Eudialyte 2.5mm/0.059ct Loose Stone with Certificate of Authenticity
coming soon 【12562018掲載】ブラジル産ヘルデライト 0.509ctルース

Brazilian Herderite 0.509ct loose stone Sale price¥35,800
Sold out グリーントルマリン 2.144ctルース

Green tourmaline 2.144ct loose
Sold out 【12548254掲載】パパラチアサファイア 0.474ctルース

[12548254 published] Padparadscha sapphire 0.474ct loose
Sold out Pink diamond 2.2mm/0.043ct loose (FANCY LIGHT PURPLISH PINK, SI2)

Pink diamond 2.2mm/0.043ct loose (FANCY LIGHT PURPLISH PINK, SI2)
Sold out Diamond 0.777ct loose (butterfly cut)

Diamond 0.777ct loose (butterfly cut)
Sold out 【12561316掲載】合成ルチル 0.768ctルース

Synthetic Rutile 0.768ct Loose
Sold out German Auyinite 3.5mm/0.131ct Loose Stone

German Auyinite 3.5mm/0.131ct Loose Stone
Sold out German Hauyne 2.2mm/0.035ct Loose Stone

German Hauyne 2.2mm/0.035ct Loose Stone
Sold out 【12559339掲載】ブラジル産インペリアルトパーズ 4.321ctルース

Brazilian Imperial Topaz 4.321ct Loose Stone with Certificate of Authenticity
Sold out [Sakura Incut] Sphene from Madagascar 6.0mm/0.865ct Loose Stone

[Sakura Incut] Sphene from Madagascar 6.0mm/0.865ct Loose Stone
Sold out Sri Lankan Moonstone 1.487ct Loose

Sri Lankan Moonstone 1.487ct Loose
Sold out Pakistani oil-in quartz 0.595ct loose

Pakistani oil-in quartz 0.595ct loose
Sold out タンザニア産アンデシン・ラブラドライト（通称名 レインボームーンストーン） 0.928ctルース

Tanzanian Andesine Labradorite (also known as Rainbow Moonstone) 0.928ct loose stone
Sold out Brazilian Yellow Beryl 1.473 ct Loose Stone

Brazilian Yellow Beryl 1.473 ct Loose Stone
Sold out Mexican Fire Opal 0.362ct Loose

Mexican Fire Opal 0.362ct Loose
Sold out スモーキークォーツ 0.691ctルース

[Koshu precious stone Kiriko plusthree] Smoky quartz 6mm/0.691ct loose with patch
coming soon ガーデンクォーツ 23.495ctルース

Garden quartz 23.495ct loose Sale price¥3,980
Sold out [Sakura In-Cut] Sapphire from Ratnapura, Sri Lanka, 6.0mm/0.839ct Loose

[Sakura In-Cut] Sapphire from Ratnapura, Sri Lanka, 6.0mm/0.839ct Loose
Sold out US Oregon Sunstone, 1.640 ct, Loose

US Oregon Sunstone, 1.640 ct, Loose
Sold out US Oregon Sunstone, 1.640 ct, Loose

US Oregon Sunstone, 1.640 ct, Loose
Sold out USA Oregon Sunstone 2.160ct Loose

USA Oregon Sunstone 2.160ct Loose
Sold out Mexican Water Opal 4.8mm/0.289ct Loose

Mexican Water Opal 4.8mm/0.289ct Loose
Sold out キャシテライト 0.571ctルース

Cassiterite 4.0mm/0.571ct Loose Stone with Certificate of Authenticity
Sold out Star Ruby from Sri Lanka, 5.0mm/1.062ct Loose Stone, with Identification Report

Star Ruby from Sri Lanka, 5.0mm/1.062ct Loose Stone, with Identification Report
Sold out Madagascar Andesine Labradorite (commonly known as Rainbow Moonstone) 4.867ct Loose Stone

Madagascar Andesine Labradorite (commonly known as Rainbow Moonstone) 4.867ct Loose Stone

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.