5 major gems

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Diamond 3.0mm/0.095ct Loose (F, VS-2, Excellent)

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ダイヤモンド 3.0mm/0.101ctルース(D, VVS-2, VeryGood)

Diamond 3.0mm/0.101ct Loose Stone (D, VVS-2, VeryGood)

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

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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

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インターナリーフローレスダイヤモンド（H&C） 0.300ctルース(D, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 4.3mm/0.300ct Loose (D, IF, 3Excellent H&C) GIA&CGL

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[On sale May 2nd at 10 PM] K18 Blue Sapphire Ring

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Colombian emerald 0.153ct rough stone

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【32501905掲載】ブルーダイヤモンド（トリートメント） 0.801ctルース(FANCY INTENSE GREEN BLUE, SI-2)

Sky Blue Diamond (Treated) 0.801ct Loose Stone (FANCY INTENSE GREEN BLUE, SI-2) Certificate

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Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)

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【22602584掲載】【カラフリ】Pt900 ブルージルコン（ラタナキリブルー） 2.27ct リング

[On sale May 1st at 10 PM] [Colorfuri] Pt900 Blue Zircon (Ratanakiri Blue) 2.27ct/Diamond 0.28ct Ring

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[Posted in 32501164] Diamond 0.141ct loose (E, VVS-2, EXCELLENT)

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Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan

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[Sale on May 12th at 10 PM] Teal Blue Sapphire 0.275 ct Loose Stone

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[On sale May 14th at 10 PM] [Colorfri] K18PG Morganite and 0.04ct Diamond Pendant Top (Necklace Top) with Appraisal Report

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[On sale May 15th at 10 PM] Tanzanian purple sapphire 0.677ct loose stone (color-shift type)

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[On sale May 24th at 10 PM] Australian Black Opal 0.522ct Loose Stone

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【On Sale May 21st, 10 PM JST】Synthetic Sapphire 2.348 ct Loose Stone

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[On sale May 15, 10 PM JST] Sri Lankan Pink Star Sapphire, 1.682ct loose stone

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Kashmir unheated sapphire 2.6mm/0.09ct loose GIA

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[ColorFleuri] K14WG Blue Sapphire 0.22ct Pendant (Necklace)

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[Sales start 10 PM, May 26th] Colorful: Pt950 Brazilian Bi-Color Emerald 1.084ct and Ice Blue Diamond 0.062ct Ring

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Non-Oil Emerald 0.555ct Loose Stone by Nikkei

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【12562862掲載】コロンビア産トラピッチェエメラルド 0.448ctルース

Colombian Trapiche Emerald, 0.446 ct, Loose Stone, with Certificate

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Colombian pyrite-mica emerald 0.844ct loose stone

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Colombian emerald 0.167ct loose stone with jewel

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Pt950 アウイナイト 0.24ct・ダイヤモンド0.18ctリング鑑別カード

[Available 5/18 10PM] [Colorful] Pt950 Hauyne 0.24ct / Diamond 0.18ct Ring with Certificate

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【Sale starts 5/26 at 10 PM JST】[Colorful] Pt900 Paraiba Tourmaline from Brazil 0.11ct / Diamond 0.58ct Ring (CuO: 2.4%, MnO: 0.9%)

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Madagascar Padparadscha Sapphire 0.517ct Loose DGL Certified

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[On sale May 27th at 10 PM JST] Madagascar Paparadscha Sapphire 0.177ct Loose Stone DGL Certified

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ピンクダイヤモンド（クッションカット） 0.157ctルース(FANCY DEEP PUPPLE PINK, I1)

Pink Diamond (Cushion Cut) 0.157ct Loose (FANCY DEEP PURPLISH PINK, I1)

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グレーダイヤモンド 0.039ctルース(LIGHT BLUISH GRAY, VS-1)

Gray Diamond 2.1mm/0.039ct Loose (LIGHT BLUISH GRAY, VS-1)

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グレーダイヤモンド 0.064ctルース(LIGHT BLUISH GRAY, SI-1)

Gray Diamond 2.5mm/0.064ct Loose (LIGHT BLUISH GRAY, SI-1) Rare Stone

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ブラウンダイヤモンド 0.600ctルース(FANCY LIGHT BROWN, SI-2)

Brown Diamond 5.3mm/0.600ct Loose Stone (FANCY LIGHT BROWN, SI-2)

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ダイヤモンド 3.2mm/0.124ctルース(D, VS-2, VeryGood)

【On Sale 5/30 10 PM】Diamond 3.2mm/0.124ct Loose Stone (D, VS-2, VeryGood)

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Mexican Hyalite Opal 1.215ct Loose (Faceted Cut)

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[Sale on June 12 at 10 PM] Ruby 0.496 ct Loose Stone (Hokikyō)

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Kashmir Sapphire 2.5mm/0.090ct Loose Stone GIA

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Unheated Kashmir Sapphire 0.120ct Loose Stone GIA

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Kashmir Unheated Sapphire 0.220ct Loose GIA

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[On sale June 3rd, 10 PM JST] Nepali Bicolor Green Kyanite 1.181ct Loose Stone

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[On Sale June 6th at 10 PM] Madagascar Padparadscha Sapphire 3.9mm/0.296ct Loose Stone with DGL Certificate

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Russian rough diamond (sawable) 0.117ct loose

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[On sale at 10 PM on June 8th] Pt900 Benitoite 0.135ct and Diamond 0.26ct Ring

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[On sale June 14th at 10 PM] Madagascar Bi-Color Sapphire 5.3mm/0.741ct Loose Stone

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【Sales start June 14, 10 PM JST】Madagascar Bi-Color Sapphire 5.4mm/0.765ct Loose

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[On sale June 23rd at 10 PM] Madagascar Blue Sapphire 4.5mm/0.406ct Loose Stone

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【On Sale June 14, 10 PM】[ColorFleuri] K18 Pink Sapphire 0.452ct Pendant Top (Necklace Top) with Certificate of Authenticity

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Pt900 合成アレキサンドライト 1.08ctct ペンダントトップ（ネックレストップ）鑑別書

[Sale starts 6/18 at 10 PM] Colorful Pt900 Synthetic Alexandrite 1.08ct Diamond 0.06ct Pendant Top (Necklace Top) with Appraisal 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.