Login

Vertical: 3.1 - 4.0mm

Sort by
coming soon [Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA

[Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA Sale price¥98,000
Sold out 中国・湖南省シンシャ（辰砂・シナバー） 0.629ctルース

[Sales start 10 PM on May 22] Cinnabar (辰砂) from Hunan, China, 0.629 ct loose, with certificate
Sold out ナイジェリア産コバルトガーナイト 0.346ctルース 鑑別書

[Sales begin 5/6 10 PM JST] Nigerian Cobalt Garnet 0.346ct Loose Stone with Gemstone Identification Report
Sold out Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)

Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)
Sold out ブラジル産パライバトルマリン 0.177ctルース

Brazilian Paraiba Tourmaline 0.177ct loose stone (CuO: 2.1%, MnO: 1.3%)
Sold out ダイヤモンド（H&C） 0.200ctルース(D, VVS-2, 3Excellent H&C)

Diamond (H&C) 3.8mm/0.200ct Loose (D, VVS-2, 3Excellent H&C) CBT

Sold out 【32501889掲載】ダイヤモンド（H&C） 0.194ctルース(G, VVS-1, 3Excellent H&C)

Diamond (H&C) 3.7mm/0.194ct Loose (G, VVS-1, 3Excellent H&C)

Sold out Madagascar Bekily Blue Garnet (Color Change Garnet) 0.221ct Loose Stone

Madagascar Bekily Blue Garnet (Color Change Garnet) 0.221ct Loose Stone
Sold out Madagascar Bekiri Blue Garnet (Color Change Garnet) 0.254ct Loose Stone

Madagascar Bekiri Blue Garnet (Color Change Garnet) 0.254ct Loose Stone

Sold out 【32501878掲載】グレーダイヤモンド 0.109ctルース(VERY LIGHT GRAY, SI-1)

Gray Diamond 3.0mm/0.109ct Loose (VERY LIGHT GRAY, SI-1)
Sold out ピンクダイヤモンド 0.060ctルース(FANCY INTENSE PINK, VS-2)

Pink Diamond 0.060ct Loose (FANCY INTENSE PINK, VS-2) CBT

Sold out 中国・湖南省シンシャ（辰砂・シナバー） 0.635ctルース

[On sale May 1st at 10 PM JST] China Hunan Cinnabar (Synsha/Cinnabar) 0.635ct Loose Gemstone with Certificate

Sold out タンザニア産ホットピンクスピネル 0.204ctルース

[On sale May 2 at 10 PM] Tanzanian Hot Pink Spinel 0.204ct Loose Stone with Certificate
Sold out 【12562750掲載】ミャンマー産レッドスピネル 0.257ctルース

Myanmar Red Spinel 3.7mm/0.257ct Loose Gemstone with Certificate

Sold out 【12562749掲載】タンザニア産オレンジスピネル 0.273ctルース

Tanzanian Orange Spinel 3.9mm/0.273ct Loose Stone with Gemstone Report

Sold out ドイツ産アウイナイト 0.122ctルース

[5/5 10 PM Sale] German Hauyne 0.122ct Loose Stone
Sold out Brazilian alexandrite 0.109ct loose

Brazilian alexandrite 0.109ct loose
Sold out ジンバブエ産バイカラーユークレース 0.132ctルース

[On sale May 5th at 10 PM] Zimbabwean bicolor euclase 0.132ct loose stone
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 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 マダガスカル産イエローサファイア 0.268ctルース

Yellow Zircon 0.268ct Loose

Sold out Colombian No-Oil Emerald 0.120ct Loose Stone GIA

Colombian No-Oil Emerald 0.120ct Loose Stone GIA
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 メキシコ産メキシコ産ニフォントバイト 0.151ctルース

Nifontovite from Mexico 0.151ct Loose Stone w/Japan-Germany Certificate

Sold out アメリカ産レッドベリル 0.120ctルース

American Red Beryl 0.120ct Loose
Sold out 【12558711掲載】ドゥニライト 0.132ctルース

Sri Lankan Dunilite 0.132ct Loose Stone with Certificate of Authenticity
Sold out 【12561951掲載】アメリカ産アントヒルガーネット 0.370ctルース

U.S. Anthill Garnet 4.0mm/0.370ct Loose
Sold out 0.084ct loose green diamond (FANCY GRAY GREEN, I-1)

0.084ct loose green diamond (FANCY GRAY GREEN, I-1)

Sold out Kenyan Tsavorite 0.164ct Loose Stone

Kenyan Tsavorite 0.164ct Loose Stone
Sold out Cambodian Blue Zircon (Ratanakiri Blue) 0.354ct Loose Stone

Cambodian Blue Zircon (Ratanakiri Blue) 0.354ct Loose Stone
Sold out Synthetic rutile 3.9mm/0.329ct loose stone

Synthetic rutile 3.9mm/0.329ct loose stone
Sold out Lazulite (0.077ct) from Pakistan, loose

Lazulite (0.077ct) from Pakistan, loose
Sold out Myanmar Red Spinel 0.196ct Loose Stone

Myanmar Red Spinel 0.196ct Loose Stone
Sold out Pink sapphire (with hematite) 0.271ct loose stone

Pink sapphire (with hematite) 0.271ct loose stone

Sold out Diamond rough (makeable) 0.353ct rough

Diamond rough (makeable) 0.353ct rough
Sold out Cornflower Blue Sapphire 0.370ct Loose AIGS

Cornflower Blue Sapphire 0.370ct Loose AIGS
Sold out Ruby 3.3mm/0.171ct Loose

Ruby 3.3mm/0.171ct Loose
Sold out 0.243ct Colombian Emerald Pair Loose Stones

0.243ct Colombian Emerald Pair Loose Stones
Sold out 0.316 ct Tanzanian Bicolor Grossular Garnet Loose Stone

0.316 ct Tanzanian Bicolor Grossular Garnet Loose Stone
Sold out U.S. Red Beryl 3.2mm/0.111ct Loose Stone

U.S. Red Beryl 3.2mm/0.111ct Loose Stone
Sold out Grandidierite from Madagascar 0.269ct loose stone

Grandidierite from Madagascar 0.269ct loose stone
Sold out Pigeon blood ruby ​​0.310ct loose

Pigeon blood ruby ​​0.310ct loose
Sold out Pigeon's Blood Ruby 4.0mm/0.230ct Loose AIGS

Pigeon's Blood Ruby 4.0mm/0.230ct Loose AIGS
Sold out パパラチアサファイア 0.191ctルース

Padparadscha sapphire 0.191ct loose stone

Sold out 0.278 ct loose Nigerian cobalt gahnite with Japanese and German appraisals

0.278 ct loose Nigerian cobalt gahnite with Japanese and German appraisals
Sold out Ruby 0.258ct loose

Ruby 0.258ct loose

Sold out Unmounted American Anthill Garnet, 4.0mm/0.269ct

Unmounted American Anthill Garnet, 4.0mm/0.269ct
Sold out USA Ant Hill Garnet 4.0mm/0.277ct Loose Stone

USA Ant Hill Garnet 4.0mm/0.277ct 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.