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[On Sale June 6th at 10 PM JST] "Limited 13 Stones" Fluorite Gacha including flawed Koshu cut gemstones "Bulk Purchase Discount Available"

[On Sale June 6th at 10 PM JST] "Limited 13 Stones" Fluorite Gacha including flawed Koshu cut gemstones "Bulk Purchase Discount Available" Sale price¥3,980
[On sale June 28th at 10 PM] Brazilian Paraiba Tourmaline Gacha with sorting results (CuO: 2.1%, MnO: 2.2%), usually ¥45,800, now with a chance to win one of 18 limited stones. (Multiple purchase discount available)

[On sale June 28th at 10 PM] Brazilian Paraiba Tourmaline Gacha with sorting results (CuO: 2.1%, MnO: 2.2%), usually ¥45,800, now with a chance to win one of 18 limited stones. (Multiple purchase discount available) Sale price¥9,800
[On sale June 27th at 10 PM] Limited to 10 Stones: Sri Lankan Chrysoberyl (Cut by Mr. Sanje) Gacha (Includes Parrot Color, Canary Yellow) [Multiple Purchase Discount Available]

[On sale June 27th at 10 PM] Limited to 10 Stones: Sri Lankan Chrysoberyl (Cut by Mr. Sanje) Gacha (Includes Parrot Color, Canary Yellow) [Multiple Purchase Discount Available] Sale price¥3,980
[On Sale June 27, 10 PM JST] "Limited to 10 Stones" Rough Stone Gacha including Paraiba Tourmaline (CuO: 1.7%+ content) and Benitoite (with a bonus Oregon Sunstone) "Multiple Purchase Discount Available"

[On Sale June 27, 10 PM JST] "Limited to 10 Stones" Rough Stone Gacha including Paraiba Tourmaline (CuO: 1.7%+ content) and Benitoite (with a bonus Oregon Sunstone) "Multiple Purchase Discount Available" Sale price¥2,980
{June Campaign Limited Edition} Rare Stone Gacha💎 Padparadscha Sapphire 0.3ct+ with Certificate, Benitoite, Red Beryl, etc. Loose Stones for 1 Stone {Multiple Purchase Discounts Available}

{June Campaign Limited Edition} Rare Stone Gacha💎 Padparadscha Sapphire 0.3ct+ with Certificate, Benitoite, Red Beryl, etc. Loose Stones for 1 Stone {Multiple Purchase Discounts Available} Sale price¥7,980
マダガスカル産ペツォッタイト 0.200ctルース

[Listed 12563403] Petzottaite from Madagascar 0.200ct Loose Sale price¥29,800
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) Sale price¥128,000
Pt900 ブラックオパール 0.58ct ペンダントトップ（ネックレストップ）鑑別書

[On sale July 11th, 10 PM JST] [Colorfrui] Pt900 Black Opal 0.58ct Pendant Top (Necklace Top) with Identification Card Sale price¥55,800
Pt900 ブラックオパール 0.66ct ペンダントトップ（ネックレストップ） 鑑別書

[On Sale July 11th at 10 PM] [Colorfri] Pt900 Black Opal 0.66ct Pendant Top (Necklace Top) with Identification Card Sale price¥55,800
ブラジル産パライバトルマリン 0.090ctルース

Paraiba tourmaline from Brazil 0.090ct loose Sale price¥69,800
ブラジル産パライバトルマリン 0.056ctルース

Paraiba tourmaline from Brazil 0.056ct loose Sale price¥45,800
パパラチアサファイア 0.156ctルース

[Sales start July 5, 10 PM JST] Madagascar Padparadscha Sapphire 3.3mm/0.156ct Loose Stone - Central Gem Laboratory certified Sale price¥29,800
パパラチアサファイア 0.416ctルース

[On sale July 5th at 10 PM] Madagascar Padparadscha Sapphire 4.5mm/0.416ct Loose Stone with Chubo Certification Sale price¥98,000
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) Sale price¥29,800
【甲州貴石切子plusthree】メキシコ産ファイアオパール 4.633ctルース《コラボ》 ワッペン

[Koshu Precious Stones plusthree] Mexican Fire Opal 4.633ct Loose Stone [Collaboration] Patch Sale price¥49,800
スリランカ産クリソベリルキャッツアイ 1.514ctルース

Sri Lankan Chrysoberyl Cat's Eye 1.514ct Loose Stone Sale price¥5,980
スリランカ産クリソベリルキャッツアイ 1.074ctルース

Sri Lankan Chrysoberyl Cat's Eye 1.074ct Loose Stone Sale price¥4,980
ブラジル産パライバトルマリン 0.360ctルース GIA鑑別書

Brazilian Paraiba Tourmaline 0.360ct Loose GIA Sale price¥298,000
パロットクリソベリルキャッツアイ 0.792ctルース

[On sale June 17th at 10 PM] Indian Parrot Chrysoberyl Cat's Eye 0.792ct Loose Stone Sale price¥29,800
インド産パロットクリソベリル 0.518ctルース

【On sale June 26th, 10 PM JST】Indian Parrot Chrysoberyl 0.518ct Loose Gemstone Sale price¥29,800
オーストラリア産ブラックオパール 3.242ctルース

Australian black opal 3.242ct loose stone Sale price¥59,800
非加熱ブラジル産パライバトルマリン 0.060ctルース（CuO:1.6%、MnO:2.3%）

Brazilian Paraiba Tourmaline 0.060ct Loose (CuO:1.6%, MnO:2.3%) Sale price¥42,800
非加熱ブラジル産パライバトルマリン 0.068ctルース（CuO:1.7%、MnO:2.4%）

Unheated Brazilian Paraiba Tourmaline 0.068ct loose stone (CuO: 1.7%, MnO: 2.4%) Sale price¥45,800
パパラチアサファイア 0.221ctルース

[On sale 7/4 10 PM] Madagascar Padparadscha Sapphire 0.221ct Loose Stone with Central Gem Lab certificate Sale price¥38,800
マダガスカル産パパラチアサファイア 0.186ctルース 中宝鑑

[On Sale June 27th, 10 PM] Madagascar Padparadscha Sapphire 0.186ct Loose Stone - Central Gemological Laboratory Sale price¥25,800
マダガスカル産パパラチアサファイア 3.4mm/0.252ctルース 中宝鑑

【On Sale June 27, 10 PM】Madagascar Padparadscha Sapphire 3.4mm/0.252ct Loose Stone - Central Gem Laboratory Sale price¥45,800
パパラチアサファイア 0.560ctルース

Padparadscha Sapphire 0.560ct Loose Stone Sale price¥75,800
パパラチアサファイア 0.278ctルース

[On sale July 4th, 10 PM JST] Madagascar Padparadscha Sapphire 4.0mm/0.278ct Loose Stone, Central Gem Lab certified Sale price¥39,800
【Sale starts July 6th at 10 PM JST】Madagascar Pezzottaite 0.323ct Loose Stone

【Sale starts July 6th at 10 PM JST】Madagascar Pezzottaite 0.323ct Loose Stone Sale price¥49,800
ファイアオパール 0.718ctルース

Mexican Fire Opal 0.718ct Loose Sale price¥9,800
ファイアオパール 0.593ctルース

Mexican Fire Opal 0.593ct Loose (Faceted Cut) Sale price¥9,800
ナイジェリア産バイカラートルマリン 0.379ctルース

Nigerian bicolor tourmaline 0.379ct loose stone Sale price¥6,980
ベニトアイト 0.099ctルース (プリンセスカット)

[Updated 12552163] Benitoite 0.099ct loose stone Sale price¥29,800
モザンビーク産パライバトルマリン 0.784ctルース（CuO:0.3%,MnO:1.3%）

[12550887] Paraiba Tourmaline from Mozambique 0.784ct loose stone Sale price¥128,000
マダガスカル産カナリーイエロークリソベリル 0.650ctルース

[On sale June 22nd at 10 PM JST] Madagascar Canary Yellow Chrysoberyl 0.650ct Loose Stone with Appraisal Sale price¥18,800
マダガスカル産カナリーイエロークリソベリル 0.569ctルース

[On sale June 26th at 10 PM] Madagascar Canary Yellow Chrysoberyl 0.569ct Loose Gemstone with Certificate Sale price¥9,800
非加熱ブラジル産パライバトルマリン 0.052ctルース

Brazilian Paraiba Tourmaline 0.052ct Loose Stone (CuO:2.0%, MnO:2.2%) Sale price¥35,800
スカイブルートパーズ 1.719ctルース

Sky blue topaz 1.719ct loose stone Sale price¥8,800
バイカラートルマリン 1.326ctルース

Brazilian Bicolor Tourmaline 7.2mm/1.326ct Loose Stone Sale price¥18,800
Brazilian Paraiba Tourmaline 0.341ct loose stone (CuO:1.81%, MnO:1.96%) Nakahokan analysis report

Brazilian Paraiba Tourmaline 0.341ct loose stone (CuO:1.81%, MnO:1.96%) Nakahokan analysis report Sale price¥598,000
非加熱ブラジル産パライバトルマリン 0.081ctルース

Unheated Brazilian Paraiba Tourmaline 0.081ct loose stone (CuO: 2.1%, MnO: 2.3%) Sale price¥75,800
Let's try jewelry polishing "Do-it-yourself rough stone polishing set" (for beginners: fluorite 2 stone set)

Let's try jewelry polishing "Do-it-yourself rough stone polishing set" (for beginners: fluorite 2 stone set) Sale price¥2,980
宝石研磨に挑戦してみよう「自分で出来る原石磨きセット」（初心者向け：フローライト・アパタイト2石セット）

Let's try gem polishing "Do-it-yourself rough stone polishing set" (for beginners: fluorite/apatite 2 stone set) Sale price¥2,980
"PSYCHO-PASS" x KARATZ Collaboration Jewelry: Public Safety Bureau Criminal Investigation Division Device-Inspired Ring with Inspector Design [Ginoza Nobuchika Model] "London Blue Topaz"

"PSYCHO-PASS" x KARATZ Collaboration Jewelry: Public Safety Bureau Criminal Investigation Division Device-Inspired Ring with Inspector Design [Ginoza Nobuchika Model] "London Blue Topaz" Sale priceFrom ¥25,800
Raw peridot + 2 loose stones set (August birthstone)《Discount available for multiple purchases》

Raw peridot + 2 loose stones set (August birthstone)《Discount available for multiple purchases》 Sale price¥2,980
Limited to 20 stones! Includes 2 Koshu Kiriko fire opals and 1 loose fire opal. Discounts available for multiple purchases.

Limited to 20 stones! Includes 2 Koshu Kiriko fire opals and 1 loose fire opal. Discounts available for multiple purchases. Sale price¥4,980
ブラジル産カラーチェンジフローライト1石ルース（6mm,ラウンドカット）《複数購入割引有》

Color change fluorite from Brazil 1 stone loose (6mm, round cut)《Multiple purchase discount available》 Sale price¥2,580

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.