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coming soon スリランカ・ラトゥナプラ産ホワイトサファイア 0.818ctルース

[Sakura Cut] White Sapphire from Ratnapura, Sri Lanka 6.0mm/0.818ct "Collaboration" Loose Gemstone Sale price¥98,000
Sold out アパタイト 0.796ctルース

[Clover in cut] Madagascar Apatite 6.0mm/0.796ct {Collaboration} Loose Stone

Sold out ダイヤモンド 0.310ctルース(E, VS1, 3Excellent)

Diamond 4.3mm/0.310ct Loose (E, VS1, 3Excellent) GIA

Sold out K18PG スピネル 0.48ct ペンダントトップ（ネックレストップ）

【CALAFULI】K18PG Pink Spinel 0.48ct Pendant Top with Identification Card
Sold out Pt900 ブルージルコン（ラタナキリブルー） 2.27ct リング

【Colorful】Pt900 Blue Zircon (Ratanakiri Blue) 2.27ct, Diamond 0.28ct Ring

Sold out Pt900 ダイヤモンド 0.5ct リング

【Calafru】Pt900 Diamond 0.5ct Ring with Identification Report
Sold out アフガニスタン産アウイナイト 0.437ctルース 中宝

Afghan Hauyne 0.437ct Loose Stone with Chubo Certificate
Sold out Loose Columbian Pyrite in Emerald 3.346 ct

Loose Columbian Pyrite in Emerald 3.346 ct

Sold out コロンビア産パイライトインエメラルド 2.503ctルース

2.503 ct Loose Emerald with Pyrite from Colombia

Sold out モザンビーク産パライバトルマリン 1.581ctルース

Paraiba tourmaline from Mozambique 1.581ct loose stone (CuO: 0.5%, MnO: 1.0%)
Sold out ブラジル産パライバトルマリン 0.216ctルース

Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)
Sold out 【12562825掲載】ミャンマー産マスグラバイト／スピネル 8.005ctルース

8.005ct Loose Myanmar Masgravite/Spinel (Symbiotic Type) with Japan-German Gemmological Institute (GGTL) Certificate

Sold out 【12562824掲載】ミャンマー産マスグラバイト／ターフェアイト 15.472ctルース

Myanmar Musgravite/Taaffeite (symbiotic type) 15.472ct Loose with GIA & ZGCL

Sold out 【12562820掲載】ブラジル産バイカラートルマリン 7.445ctルース

Brazilian bicolor tourmaline 7.445ct loose stone
Sold out ピンクダイヤモンド 0.049ctルース(FANCY PINK, VS-1)

Pink Diamond 2.3mm/0.049ct Loose Stone (FANCY PINK, VS-1) Central Gem Lab

Sold out 【32501804掲載】ダイヤモンド 0.185ctルース(I, SI1)

Diamond 0.185ct Loose Stone (I, SI1, Ashoka Cut)
Sold out Benitoite from the USA, 3.4mm/0.175ct loose

Benitoite from the USA, 3.4mm/0.175ct loose

Sold out 【12562706掲載】アメリカ産オレンジベニトアイト 0.135ctルース

0.135 ct. loose American Benitoite (Peach Benitoite), with certificate

Sold out コロンビア産ユークレース 5.223ctルース

Euclase from Colombia 5.223ct Ruth Japanese German edition

Sold out 【12562697掲載】トルマリン 5.620ctルース

[Dandelion Cut] Brazilian Tourmaline 11mm/5.620ct Loose Stone with Certification by Shimizu Kisetsu [Limited to 1 Piece] ¥59,800 Item No. 12562697

Sold out カナダ産ダイヤモンド原石（ソーヤブル） 0.328ct原石（トライゴン有り）

Canadian raw diamond (sawable) 0.328ct raw (with trigons)
Sold out K18YG ロシア産デマントイドガーネット（ホーステール認む） 0.271ct リング

K18YG Indian Moonstone Cat's Eye 1.438ct Ring
Sold out Unheated Pigeon Blood Ruby 0.260ct Loose Stone AIGS

Unheated Pigeon Blood Ruby 0.260ct Loose Stone AIGS
Sold out キャシテライト 0.868ctルース

Cassiterite from Hunan Province, China, 0.868 ct Loose Gemstone with Certificate

Sold out Bolivian Phosphophyllite 0.193ct Loose Stone with Appraisal

Bolivian Phosphophyllite 0.193ct Loose Stone with Appraisal

Sold out 高知県産血赤珊瑚 6.351ctルース

Kochi Prefecture oxblood coral 6.351ct loose
Sold out Diamond 0.320ct loose (D, VS2)

Diamond 0.320ct loose (D, VS2)
Sold out 非加熱ピジョンブラッドルビー 0.440ctルース

Untreated Pigeon Blood Ruby 0.440ct Loose AIGS

Sold out 【12561933掲載】ティールグリーンサファイア 2.058ctルース

Teal Green Sapphire 2.058 ct Loose Stone with Appraisal

Sold out 《Limited to 1 set》 Benitote gradation 6-stone set including orange benitoite (peach benitoite) (1.75mm, includes top quality) 《Multiple purchase discount available》

《Limited to 1 set》 Benitote gradation 6-stone set including orange benitoite (peach benitoite) (1.75mm, includes top quality) 《Multiple purchase discount available》
Sold out オーストラリア産シェルオパール（貝オパール） 96.177ct原石

Australian shell opal (shell opal) 96.177ct rough stone
Sold out Bicolor Sphalerite 9.8mm/4.517ct loose

Bicolor Sphalerite 9.8mm/4.517ct loose
Sold out ピンクダイヤモンド 0.073ルース(FANCY DEEP PURPLISH PINK, SI1)

Pink Diamond 0.073 Loose (FANCY DEEP PURPLISH PINK, SI1)
Sold out ミャンマー産カラーチェンジジルコン 1.00ctルース（リバースカラーチェンジ）

Myanmar color change zircon 1.00ct loose (reverse color change)
Sold out American Neptunite 0.207ct Loose Stone with Certificate of Authenticity

American Neptunite 0.207ct Loose Stone with Certificate of Authenticity
Sold out American Neptunite 0.290ct Loose Stone with Certificate of Authenticity

American Neptunite 0.290ct Loose Stone with Certificate of Authenticity
Sold out [12548259 published] Padparadscha sapphire 0.524ct loose

[12548259 published] Padparadscha sapphire 0.524ct loose
Sold out Pt950 ベニトアイト 0.17ct リング

Pt950 US Benitote 0.17ct Pink Diamond Ring

Sold out [Yukinko Cut] Siberian Blue Quartz (Synthetic Quartz) 2.420ct Loose Stone

[Yukinko Cut] Siberian Blue Quartz (Synthetic Quartz) 2.420ct Loose Stone

Sold out 【Yukinko Cut】 Siberian Blue Quartz (Synthetic Quartz) 2.503ct Loose

【Yukinko Cut】 Siberian Blue Quartz (Synthetic Quartz) 2.503ct Loose

Sold out Silky sapphire from Vietnam, 1.169ct loose stone

Silky sapphire from Vietnam, 1.169ct loose stone

Sold out Colombian emerald 10.940ct rough stone

Colombian emerald 10.940ct rough stone
Sold out Sri Lankan Cobalt Spinel (Blue Spinel) 3.202ct Loose Stone (Needle-like Inclusions) Japan-German Rare Stone

Sri Lankan Cobalt Spinel (Blue Spinel) 3.202ct Loose Stone (Needle-like Inclusions) Japan-German Rare Stone

Sold out American oil-free red beryl 2.6mm/0.050ct loose GIA

American oil-free red beryl 2.6mm/0.050ct loose GIA
Sold out Synthetic Alexandrite 2.046ct Loose

Synthetic Alexandrite 2.046ct Loose
Sold out Pink Diamond 0.139ct Loose (FANCY PURPLISH PINK, I1)

Pink Diamond 0.139ct Loose (FANCY PURPLISH PINK, I1)
Sold out Pt950 Bicolor Sapphire Pendant Top (Necklace Top)

Pt950 Bicolor Sapphire Pendant Top (Necklace Top)

Sold out Cornflower Blue Sapphire 0.370ct Loose AIGS

Cornflower Blue Sapphire 0.370ct Loose AIGS

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.