Product list

Sold out

K18ホワイトオパール0.10 ct ペンダント（ネックレス） - KARATZ STORE｜カラッツSTORE

K18 white opal 0.10 ct pendant (necklace)

Sold out

モザンビーク産ピジョンブラッドルビー 0.35ctルース AIGS付 - KARATZ STORE｜カラッツSTORE

Pigeon blood ruby from Mozambique 0.35ct loose with AIGS

Sold out

パパラチアサファイア 0.282ctルース中宝鑑付 - KARATZ STORE｜カラッツSTORE

Padparadscha sapphire 0.282ct loose medium treasure appraisal

Sold out

(In Stock) Lottery Sale 4 [For Winners Only] [Published on 12559711] Colombian Oil-Free Emerald 0.050ct Loose Stone (NONE) GIA

Sold out

[Lottery Sale 0620_06] Boké Coral (Kochi Prefecture) 6.735ct Loose

Sold out

[Lottery Sale 0731_07] Unheated Montana Sapphire (Yogo Mine) 0.186ct Loose Stone with Japan-Germany Gemological Analysis Report

Sold out

[Deadline: Thursday, May 14th, 10 am JST] Lottery Sale_0508_10 Colombian Pyrite in Emerald Loose Stone, 4.680ct

Sold out

US Benitoite 0.148ct Loose Stone (Emerald Cut) with Gem Identification Report

Sold out

[Lottery Sale 0725_11] Burmese Pigeon Blood Ruby 0.450ct Loose AIGS

Sold out

[Lottery Sale 0718_11] Pink Grossular Garnet from Myanmar, 0.558 ct. Loose Stone, JGGL certified

Sold out

Pt900 マダガスカル産パパラチアサファイア 4.2mm/0.34ct ・ダイヤモンド0.18ctペンダントトップ（ネックレストップ）中宝鑑

Pt900 Madagascar Paparadscha Sapphire 4.2mm/0.34ct ・Diamond 0.18ct Pendant Top, Central Gemological Laboratory of Japan certified

Sold out

Pt900 コロンビア産ミントカラーエメラルド 4mm/0.22ct ・ダイヤモンド0.16ctペンダントトップ（ネックレストップ）鑑別書

Pt900 Colombia Mint Color Emerald 4mm/0.22ct & Diamond 0.16ct Pendant Top with Certificate

Sold out

【#202607 Akihabara Pop-up, Currently Out of Stock】【12563269 Posted】Rough Diamond (Sawable) from South Africa 0.280ct

Sold out

[#202607 Akihabara Popup Exhibit] [Published in 12563402] Petzottaite, Madagascar, 0.188ct Loose

Sold out

[#202607AkihabaraPopUpTakeOut][12563062Published] Padparadscha Sapphire 0.690ct Loose Stone

Sold out

[#202607AkihabaraPopUpOnLoan][12563137 Listed] Brazilian Santa Maria Aquamarine 0.264ct Loose Stone

Sold out

#202607 Akihabara Pop-up Store (currently out of office) #12563139 Listed: Brazilian Santa Maria Aquamarine, 0.339ct Loose Stone

Sold out

[#202607 Akihabara Pop-up Store - Currently Removed] [12559462 Listed] Nigerian Mandarin Garnet 1.347ct Loose Gemstone

Sold out

[#202607 Akihabara Pop-up Store Takeout in Progress] [12559784 Posted] Hackmanite 0.110ct Loose Stone

Sold out

[#202607 Akihabara Pop-up Store Carry Out] [12559782 Listed] Hackmanite 0.142ct Loose

Sold out

【#202607 Akihabara Pop-up Items Out for Display】【12555648 Posted】Ludwigite in Peridot from Pakistan 1.624ct Loose

Sold out

【スターインカット】メキシコ産ファイアオパール 7mm/0.678ctルースワッペン付

[Star in cut] Mexican fire opal 7mm/0.678ct loose patch

Sold out

K18 マダガスカル産パパラチアサファイア 0.278ct・ダイヤモンド0.67ctリング DGL鑑

K18 Madagascar Padparadscha Sapphire 0.278ct / Diamond 0.67ct Ring DGL Certification

Sold out

Pt950 ピンクダイヤモンド 0.058ct（FANCY INTENSE PURPLE PINK）・ダイヤモンド0.11ctリング中宝ソーティング

Pt950 Pink Diamond 0.058ct (FANCY INTENSE PURPLE PINK) / Diamond 0.11ct Ring with CGL Sorting

Sold out

K18 ブラジル産パライバトルマリン 0.080ct・ダイヤモンド0.56ctペンダントトップ（ネックレストップ）（CuO:2.3%、MnO:0.6%）

K18 Brazilian Paraiba Tourmaline 0.080ct / Diamond 0.56ct Pendant Top (Necklace Top) (CuO: 2.3%, MnO: 0.6%)

Sold out

[On sale August 10, 10 PM] K18PG Azuki Chain (Azuki Chain) approx. 40cm

Sold out

[Sales start August 10 at 10 PM JST] Pt850 Venetian Chain, approx. 40cm

Sold out

カメレオンダイヤモンド 0.255ctルース(FANCY LIGHT GRAYISH GREENISH YELLOW（カメレオン）, SI-2)

[On Sale 8/13 at 10 PM] Chameleon Diamond 0.255ct Loose (FANCY LIGHT GRAYISH GREENISH YELLOW (Chameleon), SI-2)

Sold out

[Sales begin 8/9 10 PM JST] Afghanite from Afghanistan, 0.018ct Loose Stone with Certificate

Sold out

[On Sale August 13 at 10 PM] 0.669ct Loose Sphene from Zimbabwe with Certificate

Sold out

[On Sale August 13th at 10 PM] Zimbabwe Sphene 0.499ct Loose Gemstone with Certificate

Sold out

【Sakura Shape】Synthetic Sapphire 8.8mm/3.631ct Loose Stone

Sold out

【#202607 Akihabara Pop-up Store - Currently out on loan】【22602619 Listed】K18 Blood Coral 0.33ct Pendant (Necklace)

Sold out

[On sale August 16th at 10 PM] Pakistani Lazurite 0.097ct Loose Gemstone with Certificate

Sold out

【On sale August 9th at 10 PM JST】Brazilian Spessartine Garnet, 0.580 ct Loose Stone, with Identification Report

Sold out

Sphene from Brazil (Fana-ginho), 0.476 ct, with laboratory report

coming soon

[Lottery Sale 0812_16] Unheated Jedi Spinel from Burma 0.510ct Loose Stone GUILD Sale price¥118,000

Sold out

【ダンデライオンカット】タンザニア産ブルースピネル 6.0mm/0.953ctルース鑑別書鑑定士が運営しています。

[Dandelion Cut] Tanzanian Blue Spinel 6.0mm/0.953ct Loose Stone with Certificate

Sold out

[Listed in 12563739] Green Tourmaline Loose Stone from Brazil 0.906ct

Sold out

【Sales start 10 PM, August 2 JST】Bicolor Euclase from Zimbabwe 0.066ct Loose Stone

Sold out

[On sale August 2nd, 10 PM JST] Bicolor Euclase from Zimbabwe, 0.081ct loose gemstone

Sold out

[On sale 8/2 10 PM JST] Bicolor Euclase from Zimbabwe 0.058ct Loose Stone

Sold out

[On sale July 26th, 10 PM] カラフリ (Colorfrui) K18WG Screw Chain Necklace, approx. 45cm, adjustable length

Sold out

[On sale August 1 at 10 PM] Limited 10 Stones: Sapphire Gacha (including unheated cornflower blue sapphires, normally ¥69,800), with a bonus Sange sapphire. Multiple purchase discount available.

Sold out

ダイヤモンド（H&C） 0.257ctルース(D, SI1, Excellent H&C)

Diamond (H&C) 0.257ct Loose Stone (D, SI-1, Excellent H&C)

Sold out

ダイヤモンド（H&C） 0.504ctルース(F, VS-1, 3Excellent H&C)

Diamond (H&C) 0.504ct Loose (F, VS-1, 3Excellent H&C)

Sold out

Pt900 ピンクサファイア 0.465ct・ダイヤモンド0.12ctリング鑑別書

[On sale August 6th, 10 PM JST] [Colorflee] Pt900 Pink Sapphire 0.465ct, Diamond 0.12ct Ring with identification report

Sold out

[On sale August 2nd at 10 PM] Colombian pyrite and mica-in-emerald 0.271ct loose stone with gemological report

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.