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Sold out モスアゲート 0.301ctルース

Indian Moss Agate 0.301ct Loose Stone (Princess Cut)
Sold out モスアゲート 0.575ctルース

Indian Moss Agate 0.575ct Loose Stone
Sold out モスアゲート 0.505ctルース

Indian Moss Agate 0.505ct Loose Stone

Sold out メキシコ産ハイアライトオパール 0.439ctルース

Mexican Hyalite Opal 5.2mm/0.439ct Loose Stone
Sold out Limited to 3 stones: Brazilian Trapiche Amethyst (with mother rock) 1 loose stone (average 33ct, February birthstone) Multiple purchase discounts available

Limited to 3 stones: Brazilian Trapiche Amethyst (with mother rock) 1 loose stone (average 33ct, February birthstone) Multiple purchase discounts available
Sold out Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available

Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available
Sold out [Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]

[Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]
Sold out ナイジェリア産ピンクトルマリン 1.527ctルース

Nigerian pink tourmaline 1.527ct loose stone
Sold out ピンクインペリアルトパーズ 1.511ctルース 日独鑑

Brazilian Pink Imperial Topaz 1.511ct Loose Japanese-German Edition
Sold out 【甲州貴石切子】バイカラーフローライト 20.850ctルース《コラボ》 ワッペン付

[Koshu Precious Stone Cut] Bicolor Fluorite 20.850ct Loose Stone [Collaboration] Patch
Sold out ローズクォーツ 33.630ctルース

Brazilian Rose Quartz 33.630ct Loose Stone
Sold out コロンビア産エメラルドキャッツアイ 0.083ctルース

Colombian emerald cat's eye 0.083ct loose
Sold out デンドリティッククォーツ 1.547ctルース

Brazilian Dendritic Quartz 1.547ct Loose Stone
Sold out ティンカーベルクォーツ（ピンクファイヤークォーツ） 3.616ctルース

Brazilian Tinkerbell Quartz (Pink Fire Quartz) 3.616ct Loose Stone
Sold out ブラッドショットアイオライトサンストーン 1.090ctルース

Indian Bloodshot Iolite Sunstone 1.090ct Loose
Sold out ダイオプテーズ 0.121ctルース 日独鑑

Dioptase from Namibia 0.121ct loose Japanese-German book
Sold out 【甲州貴石切子】ロンドンブルートパーズ 10.514ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Cutting] London Blue Topaz 10.514ct {Collaboration} Loose Patch
Sold out Limited to 6 stones: 1 loose sphene stone from Madagascar (round cut, 4mm) Multiple purchase discounts available

Limited to 6 stones: 1 loose sphene stone from Madagascar (round cut, 4mm) Multiple purchase discounts available
Sold out 【甲州貴石切子】アパタイト 2.310ctルース

[Koshu Precious Stones plusthree] Madagascar Apatite 2.310ct Loose Color "Collaboration" Patch

Sold out デンドリティックアゲート 68.090ctルース

Brazilian Dendritic Agate 68.090ct Loose

Sold out [Koshu Precious Stones plusthree] Bicolor Fluorite 5.030ct Loose Stone

[Koshu Precious Stones plusthree] Bicolor Fluorite 5.030ct Loose Stone

Sold out 【甲州貴石切子】スフェーン 1.471ctルース

[Koshu Precious Stones plusthree] Madagascar Sphene 1.471ct Loose Stone [Collaboration] Patch

Sold out 南アフリカ産ロードクロサイト 0.680ctルース

South African Rhodochrosite 5.5mm/0.680ct Loose Stone
Sold out コンクパール 0.775ctルース《6月誕生石》

Dominican Republic Conch Pearl 0.775ct Loose (with flame pattern)
Sold out デュモルチェライトインクォーツ 55.207ct 原石

Brazilian Dumortierite in Quartz 55.207ct Rough Stone
Sold out American Benitoite 5-stone set 2.0mm/0.124ct loose stone

American Benitoite 5-stone set 2.0mm/0.124ct loose stone
Sold out Diamond 3.2mm/0.129ct loose (F, SI-1, EXCELLENT)

Diamond 3.2mm/0.129ct loose (F, SI-1, EXCELLENT)
Sold out Limited to 5 stones: 1 colorless apatite loose stone from Madagascar (all stones come with identification certificate, average 0.40ct) Discounts for multiple purchases available

Limited to 5 stones: 1 colorless apatite loose stone from Madagascar (all stones come with identification certificate, average 0.40ct) Discounts for multiple purchases available
Sold out Limited to 9 stones: 1 colorless apatite loose stone from Madagascar (average 0.30ct, many inclusions) Multiple purchase discounts available

Limited to 9 stones: 1 colorless apatite loose stone from Madagascar (average 0.30ct, many inclusions) Multiple purchase discounts available
Sold out Limited to 15 stones Apatite Gacha💎 Zimbabwean apatite, purple apatite, etc. 1 loose stone (with defects) Multiple purchase discounts available

Limited to 15 stones Apatite Gacha💎 Zimbabwean apatite, purple apatite, etc. 1 loose stone (with defects) Multiple purchase discounts available
Sold out Limited to 5 stones: 1 Indian Iolite Sunstone (impregnated) loose stone (average 6.6 carats, cabochon cut) Multiple purchase discounts available

Limited to 5 stones: 1 Indian Iolite Sunstone (impregnated) loose stone (average 6.6 carats, cabochon cut) Multiple purchase discounts available
Sold out [Koshu Precious Stones Plusthree] Sri Lankan Hessonite Garnet 0.99ct Loose Color "Collaboration" Patch

[Koshu Precious Stones Plusthree] Sri Lankan Hessonite Garnet 0.99ct Loose Color "Collaboration" Patch
Sold out バイカラーサファイア 0.417ctルース

Tanzanian bicolor sapphire 0.417ct loose stone
Sold out [On sale from 10pm on 5/5] Limited to 11 stones Russian Demantoid Garnet (2-2.3mm, round cut, with horsetail) 1 stone [Multiple purchase discounts available]

[On sale from 10pm on 5/5] Limited to 11 stones Russian Demantoid Garnet (2-2.3mm, round cut, with horsetail) 1 stone [Multiple purchase discounts available]
Sold out マリ共和国産マリガーネット（グロッシュラー/アンドラダイト・ガーネット） 4.0mm/0.408ctルース 鑑別書

Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.408ct Loose Stone with Certificate of Authenticity
Sold out Mali Garnet (Grossular/Andradite Garnet) 4.2mm/0.457ct Loose Stone with Certificate of Authenticity

Mali Garnet (Grossular/Andradite Garnet) 4.2mm/0.457ct Loose Stone with Certificate of Authenticity
Sold out Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.355ct Loose Stone with Certificate of Authenticity

Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.355ct Loose Stone with Certificate of Authenticity
Sold out エチオピア産サンストーン 0.590ctルース

Ethiopian Sunstone 0.590ct Loose
Sold out イエローサファイア 0.302ctルース

Sri Lankan Yellow Sapphire 0.302ct Loose
Sold out ブルーサファイア 0.448ctルース

Madagascar Blue Sapphire 0.448ct Loose
Sold out ブルーサファイア 0.194ctルース

Madagascar Blue Sapphire 0.194ct Loose
Sold out ブラジル産グリーン・スポジュメン 1.164ctルース

Brazilian Green Spodumene 1.164ct Loose Stone
Sold out ブラジル産グリーン・スポジュメン 1.721ctルース

Brazilian Green Spodumene 7.9mm/1.721ct Loose Stone
Sold out ブラジル産グリーン・スポジュメン 0.599ctルース

Brazilian Green Spodumene 0.599ct Loose Stone
Sold out Limited Quantity Gem Gacha! Win 1 or 2 gems, including pink diamonds and 46ct candela opals. Discounts available for multiple purchases.

Limited Quantity Gem Gacha! Win 1 or 2 gems, including pink diamonds and 46ct candela opals. Discounts available for multiple purchases.
Sold out タンザニア産タンザナイト 0.780ctルース

[Sakura In-Cut] Tanzanite from Tanzania 6.0mm/0.780ct Loose
Sold out K18YG コーネルピン 0.217ct リング

18K Yellow Gold Tanzanian Kornerupine 0.217ct Aquamarine Ring
Sold out [Koshu precious stone Kiriko plusthree] Light citrine 2.490ct loose with patch

[Koshu precious stone Kiriko plusthree] Light citrine 2.490ct loose with patch

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.