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スリランカ産クリソベリルキャッツアイ 5.176ctルース

Chrysoberyl cat's eye from Sri Lanka 5.176ct loose Sale price¥198,000
ブラジル産ルチルレイテッドクォーツ1石ルース（6mm）《複数購入割引有》

Brazilian rutilated quartz (rutilated quartz) 1 loose stone (6mm) {Multiple purchase discounts available} Sale price¥1,500
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
ルチルクォーツ1石ルース（12mm）《複数購入割引有》

Rutilated quartz 1 stone loose (12mm)《Multiple purchase discount available》 Sale price¥1,980
ラブラドライト1石ルース（12×16mm）《複数購入割引有》

Labradorite 1 stone loose (12 x 16mm)《Multiple purchase discount available》 Sale price¥2,580
Maushitsit (Mawsissi) from Myanmar 1 stone loose (12mm)《Multiple purchase discount available》

Maushitsit (Mawsissi) from Myanmar 1 stone loose (12mm)《Multiple purchase discount available》 Sale price¥2,980
パープルスピネル 0.754ctルース

Purple spinel 0.754ct loose Sale price¥9,800
ブルースピネル 1.949ctルース

Blue spinel 1.949ct loose Sale price¥29,800
ラベンダースピネル 0.305ctルース

Lavender spinel 0.305ct loose Sale price¥7,980
イギリス産ロジャリーフローライト 1.841ctルース

British Rosary Fluorite 1.841ct loose Sale price¥5,980
Lab-Grown Diamond (Synthetic Diamond) [HPHT Method] Single Loose Stone (2.0mm, 2.2mm, 2.4mm, 2.6mm) [Multiple Purchase Discounts Available]

Lab-Grown Diamond (Synthetic Diamond) [HPHT Method] Single Loose Stone (2.0mm, 2.2mm, 2.4mm, 2.6mm) [Multiple Purchase Discounts Available] Sale priceFrom ¥1,580
カラーチェンジアンデシン1石（5×3mm,オーバルカット）《複数購入割引有》

[Available from 9/7, 10 PM] 《Limited Quantity》 Color-Change Andesine Loose Stone from Mongolia (5×3mm, Oval Cut) 《Multi-buy Discount Available》 Sale price¥3,580
カラーチェンジアンデシン1石（3mm,ラウンドカット）《複数購入割引有》

[On sale 9/7 at 10 PM] <> Mongolian Color-Change Andesine Loose Gemstone (3mm, Round Cut) <> Sale price¥1,880
コロンビア産エメラルド ルース・原石2石セット（ラウンドカット3mm）

Colombian emerald loose rough stone set of 2 stones (round cut 3mm)《Multiple purchase discount available》 Sale price¥6,980
コーネルピンキャッツアイ 0.513ctルース

Cornel pin cat's eye 0.513ct loose Sale price¥6,980
コーネルピンキャッツアイ 0.872ctルース

Cornel pin cat's eye 0.872ct loose Sale price¥6,980
タンザナイト 1.360ctルース

Tanzanite 1.360ct loose stone Sale price¥49,800
ラブラドライト1石（球体,6mm）ルース

Labradorite 1 stone (spherical, 6mm) loose (multiple purchase discount available) Sale price¥2,980
カイヤナイト 原石・ルース2石セット

Kyanite raw stone/loose 2 stone set《Multiple purchase discount available》 Sale price¥2,980
パイロープ・スペサルティンガーネット（カラーチェンジガーネット）1石 ルース

Pyrope spessartine garnet (color change garnet) 1 stone loose (multiple purchase discount available) Sale price¥5,980
合成ブラックモアッサナイト（ブラックモアサナイト）1石ルース《バンコク買付品》

Synthetic black moissanite (black moissanite) 1 stone loose (2.5mm, round cut)《Multiple purchase discount available》 Sale price¥2,980
ビルマ産スピネル1石ルース（ペンタゴナルカット）《バンコク買付品》

1 stone loose spinel from Myanmar (Pentagonal cut)《Discount available for multiple purchases》 Sale price¥3,980
ダイヤモンド 0.348ctルース(I, SI1)

Diamond 0.348ct loose (I, SI1) Sale price¥59,800
【12530283掲載】カンテラオパール 17.221ctルース

Cantera opal 17.221ct loose Sale price¥25,800
H&amp;C (Hearts &amp; Cupids) Diamond 1.2mm Loose (VS Class, DG Class, Melee Diamonds) {Multiple Purchase Discounts Available}

H&C (Hearts & Cupids) Diamond 1.2mm Loose (VS Class, DG Class, Melee Diamonds) {Multiple Purchase Discounts Available} Sale price¥3,980
合成モアッサナイト1石ルース（ミントグリーン,オーバルカット,6×4mm)

Synthetic moissanite 1 stone loose (mint green, oval cut, 6 x 4 mm, moissanite)《Multiple purchase discount available》 Sale price¥3,980
合成モアッサナイト1石ルース（ミントグリーン,ペアシェイプカット,5×7mm)

Synthetic moissanite 1 stone loose (mint green, pear shape cut, 5 x 7 mm, moissanite)《Multiple purchase discount available》 Sale price¥3,980
H&amp;C (Heart &amp; Cupid) Diamond 2.0mm Loose (VS Class, DG Class, 2mm Melee Diamonds) {Multiple Purchase Discounts Available}

H&C (Heart & Cupid) Diamond 2.0mm Loose (VS Class, DG Class, 2mm Melee Diamonds) {Multiple Purchase Discounts Available} Sale price¥7,980
Diamond loose sorting transition fee

Diamond loose sorting transition fee Sale price¥3,000
Petalite 1 stone loose (6mm, round cut)《Multiple purchase discount available》

Petalite 1 stone loose (6mm, round cut)《Multiple purchase discount available》 Sale price¥2,580
スキャポライトキャッツアイ 8.880ctルース

Scapolite Cat's Eye 8.880ct Loose Sale price¥8,800
Diamond loose/certificate transfer fee

Diamond loose/certificate transfer fee Sale price¥6,600
[Jeweler's Tools] Color change penlight loose set

[Jeweler's Tools] Color change penlight loose set Sale price¥4,980
[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones

[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones Sale price¥6,980
[Jeweler's Tools] White penlight (for loose), loose 3-piece set

[Jeweler's Tools] White penlight (for loose), loose 3-piece set Sale price¥5,980
Sold out イエローダイヤモンド 0.245ctルース(FANCY INTENSE ORANGY YELLOW, SI1)

【#202607AkihabaraPop-upOutOfStock】【Shinjuku Marui Annex 202605 OutOfStock】【#202604KobeOutOfStock】【#202509ShinjukuMarui OutOfStock】Yellow Diamond 0.245ct Loose (FANCY INTENSE ORANGY YELLOW, SI1)
Sold out ブラジル産非加熱インペリアルトパーズ（シェリーカラー） 1.042ctルース 鑑別書

[Listing 12564053] Brazilian Imperial Topaz 1.042ct Loose Stone

Sold out タンザニア産ミントダイオプサイド 0.794ctルース

[Item 12564022] Tanzanian Mint Diopside 0.794ct Loose Stone
Sold out ブラジル産スペサルティンガーネット 0.923ctルース

[Listed as 12564067] Brazilian Spessartine Garnet 0.923ct Loose Stone
Sold out マダガスカル産ロイヤルブルーサファイア 0.559ctルース

[12564014 listed] Madagascar Royal Blue Sapphire 0.559ct Loose Stone
Sold out マダガスカル産パパラチアサファイア 0.164ctルース

[Posted on 12563959] Madagascar Padparadscha Sapphire 0.164ct Loose Stone
Sold out ブラジル産マイクロライト 0.138ctルース

【#202607 Akihabara Pop-up Store - Currently Removed for Display】Lottery Sale: Brazilian Microlite Loose Stone, 0.138ct
Sold out (In Stock) Lottery Sale 4 [For Winners Only] [Published on 12559711] Colombian Oil-Free Emerald 0.050ct Loose Stone (NONE) GIA

(In Stock) Lottery Sale 4 [For Winners Only] [Published on 12559711] Colombian Oil-Free Emerald 0.050ct Loose Stone (NONE) GIA
Sold out 高知県産ボケ珊瑚（サンゴ） 6.735ctルース

[Lottery Sale 0620_06] Boké Coral (Kochi Prefecture) 6.735ct Loose
Sold out 非加熱モンタナサファイア（ヨーゴ産） 0.186ctルース 日独鑑分析報告書付き

[Lottery Sale 0731_07] Unheated Montana Sapphire (Yogo Mine) 0.186ct Loose Stone with Japan-Germany Gemological Analysis Report
Sold out コロンビア産パイライトインエメラルド 4.680ctルース

[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

US Benitoite 0.148ct Loose Stone (Emerald Cut) with Gem Identification Report
Sold out ビルマ産ピジョンブラッドルビー 0.450ctルース

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