5 major gems

Sold out

[Available 9/23 at 10 PM] Australian Black Opal 0.175ct Loose Stone

Sold out

[On sale 9/23 at 10 PM] Australian Black Opal 0.256ct Loose Stone

Sold out

Pink Diamond Loot Box💎 Fancy Orange Pink 0.188ct and other Fancy-colored pink diamonds (all stones sorted or certified) 《Multiple purchase discounts available》

Sold out

[Available 9/20 at 10:00 PM] [Coloriful] Pt900 Hauyne 0.04ct & Diamond Ring with Identification Report

coming soon

K14WG 合成アレキサンドライト 0.46ct ダイヤモンド 0.21ctペンダントトップ（ネックレストップ）鑑別書

14K White Gold Lab-Created Alexandrite 0.46ct and Diamond 0.21ct Pendant Top (Necklace Top) with Appraisal Report Sale price¥49,800

Sold out

K18WG タンザナイト1.79ct・ダイヤモンド0.07ctペンダント（ネックレス）

[On sale 9/20 at 10:00 PM] [Colorifi] 18K White Gold Tanzanite 1.79ct / Diamond 0.07ct Pendant (Necklace)

Sold out

Pt900/Pt850 ブラジル産パライバトルマリン 0.08ct（CuO:2.0%、MnO:1.1%）・ダイヤモンド 0.56ctペンダント（ネックレス）鑑別書

[Available 9/20 at 10 PM] [Colori] Pt900/Pt850 Brazilian Paraiba Tourmaline 0.08ct (CuO: 2.0%, MnO: 1.1%) & Diamond 0.56ct Pendant (Necklace) with Appraisal Report

Sold out

Russian Emerald 0.280ct Loose Stone (F1) GIA

Sold out

Pt900 Brazilian Paraiba Tourmaline 0.221ct (CuO: 1.7%, MnO: 2.4%) & Diamond 0.10ct Ring with Identification Report

Sold out

Pt900 エメラルド 0.47ct ダイヤモンド0.13ctペンダントトップ（ネックレストップ）鑑別書

[Available 9/18 at 10 PM] [Colori] Pt900 Emerald 0.47ct & Diamond 0.13ct Pendant Top (Necklace Top) with Appraisal Report

Sold out

Pt900 タンザナイト0.99ct・ダイヤモンド・エメラルドペンダントトップ鑑別書

[Available 9/18 at 10 PM] [Coloriful] Pt900 Tanzanite 0.99ct, Diamond, & Emerald Pendant Top (Includes Appraisal Report)

Sold out

[Available 9/30 at 10 PM] [Colori] Pt900 1.00ct Diamond Three-Stone Ring with Appraisal Report

Sold out

K18YG ウォーターオパール（ファセットカット） 0.457ct リング鑑別書

18K Yellow Gold Mexican Water Opal (Facet Cut) 0.457ct Ring with Appraisal Certificate

Sold out

Sri Lanka Unheated Pink Sapphire 0.750ct Loose Stone GIA

Sold out

[Deadline: Wed, Oct 21, 10:00 AM: Lottery Sale] Sri Lankan Unheated Purple Sapphire (Color-shift type) 0.620ct Loose Stone GIA

Sold out

【Available 9/21 at 10 PM】 Colombian Emerald 0.070ct Loose Stone

Sold out

【Available 9/21, 10 PM】 Zambian Emerald 0.199ct Loose Gemstone

Sold out

[Available 9/21 at 10 PM] Sri Lankan Blue Sapphire 5.3mm/0.754ct Loose Stone

Sold out

Colombian pyrite-mica emerald 0.739ct loose stone

Sold out

[Available Sept. 12, 10:00 PM] Sri Lankan Silky Pink Sapphire 5.0mm/0.544ct Loose Gemstone with Identification Report

Sold out

[Available 9/12, 10 PM] Sri Lankan Blue Sapphire 0.680ct Loose Gemstone with Identification Report

Sold out

[Available Sept 13, 10 PM] Australian White Opal 0.584ct Loose Stone (Rose Cut)

Sold out

【On sale 9/12 at 10 PM】 Kenyan unheated gold sheen sapphire 0.329ct loose stone with appraisal report

Sold out

[On sale 9/17 at 22:00] Kenya Unheated Gold Sheen Sapphire 0.531ct Loose Gemstone with Identification Report

Sold out

[Available 9/17 at 10:00 PM] Kenyan unheated gold sheen sapphire 0.166ct loose stone with appraisal report

Sold out

[Available 9/17 at 10:00 PM] Kenyan Unheated Gold Sheen Sapphire 0.188ct Loose Gemstone with Identification Report

Sold out

[Available 9/17 at 10 PM] Kenyan Unheated Gold Sheen Sapphire 0.398ct Loose Stone with Appraisal Report

Sold out

K18 ロシア産デマントイドガーネット（ホーステール認む） 4.6mm/0.44ctct ダイヤモンド 0.57ctリング鑑別書

[Available Sept 6, 10 PM] K18 Russian Demantoid Garnet (horsetail inclusions visible) 4.6mm/0.44ct, Diamond 0.57ct Ring with Appraisal Report

Sold out

Pyrite in Emerald from Colombia, 2.905ct loose stone

Sold out

Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]

Sold out

[Lottery Sale 0707_04] Unheated Kashmir Sapphire 0.220ct Loose Stone GIA

Sold out

Montana Sapphire 0.331ct Loose (Bi-Color Sapphire)

Sold out

【12553261掲載】ロシア産ダイヤモンド原石（ソーヤブル） 0.094ctルース

Russian diamond rough (sawable) 0.094ct rough

Sold out

[Lottery Sale 0731_05] Colombian Trapiche Emerald 1.591ct Loose Gemstone with Japanese and German Gemological Certificates

Sold out

ピンクダイヤモンド 0.127ctルース(FANCY INTENSE PURPLE PINK, SI2)

Pink diamond 0.127ct loose stone (FANCY INTENSE PURPLE PINK, SI-2)

Sold out

Pt900 特殊カットダイヤモンド 0.327ct（VS-1、Iカラー)リング中宝

[9/15 10:00 PM Release] [Colori] 18KWG Special Cut Diamond 4.5mm/0.327ct (VS-1, I Color) Ring - CGL Certified

Sold out

[9/9 10 PM Release] [Colori] K18 Rose-Cut Diamond Bracelet

Sold out

Pt950アレキサンドライト0.07ct・ダイヤモンド 0.03ctペンダントトップ（ネックレストップ）鑑別書

[Available 9/15, 10:00 PM] [Colori] Pt950 Alexandrite 0.07ct / Diamond 0.03ct Pendant Top (Necklace Top) with Appraisal Report

Sold out

K18WG ブルーサファイアパライバトルマリン、アクアマリン、エメラルド、アイスブルーダイヤモンド(トリートメント)、ブルーサファイア、イエローサファイア、アパタイト、ペリドット、タンザナイト、ブルートパーズリング鑑別書

[Available 9/9 at 10 PM] [Colori] K18WG Blue Sapphire, Paraiba Tourmaline, Aquamarine, Emerald, Ice Blue Diamond, Yellow Sapphire, Apatite, Peridot, Tanzanite, Blue Topaz Ring with Appraisal Certificate

Sold out

Pt850 ドイツ産アウイナイト 3.6mm/0.13ctct ダイヤモンド0.20ctペンダントトップ（ネックレストップ）鑑別書

Pt850 German Hauyne 3.6mm/0.13ct, Diamond 0.20ct Pendant Top (Necklace Top) with Identification Report

Sold out

Pt900 合成アレキサンドライト 1.32ct ダイヤモンド 0.22ctペンダントトップ（ネックレストップ）鑑別書

Pt900 Synthetic Alexandrite 1.32ct, Diamond 0.22ct Pendant Top (Necklace Top) with Identification Report

Sold out

Pt900 ロイヤルブルーサファイア 0.361ct・ダイヤモンド0.86ctリング鑑別書

[On sale 9/14 at 10 PM] [Coloriful] Pt900 Royal Blue Sapphire 0.361ct & Diamond 0.86ct Ring with Appraisal Report

Sold out

[Available 9/4 at 10 PM] Australian White Opal 1.138ct Loose Stone

Sold out

[Available 9/6 at 10 PM] Tanzanian Windsor Sapphire (Purple Sapphire) 0.282ct Loose Stone

Sold out

【Available 9/6 22:00】Tanzania Windsor Sapphire (Purple Sapphire) 0.213ct Loose Stone

Sold out

[On sale 9/11 at 10 PM] Synthetic Blue Sapphire Loose Stone, 1.791 ct

Sold out

[Lottery Sale 0825_09] Colombian Non-Oil Emerald 0.080ct Loose GIA

Sold out

[Lottery Sale 0818_06] Madagascar Royal Blue Sapphire 0.623ct Loose Stone with Certificate

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.