5 major gems

[Available 10/4, 10 PM] Kenyan Unheated Gold Sheen Sapphire 0.224ct Loose Gemstone with Identification Report Sale price¥15,800

K18 マダガスカル産パパラチアサファイア 4.3mm/0.412ct・ダイヤモンド0.57ctリング中宝鑑

[Lottery Sale 0812_11] K18 Madagascar Padparadscha Sapphire 0.412ct / Diamond 0.57ct Ring Sale price¥168,000

インターナリーフローレスダイヤモンド（H&C） 4.0mm/0.245ctルース(D, IF, 3Excellent H&C)

【9/6 10:00 PM Sale】Internally Flawless Diamond (H&C) 4.0mm/0.245ct Loose (D, IF, 3Excellent H&C) Sale price¥128,000

Pt900 キャシテライト 4mm/0.57ct ・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

[Lottery Sale 0812_03] Pt900 Cassiterite from Yunnan Province, China 4mm/0.57ct Diamond 0.16ct Pendant Top (Necklace Top) with Appraisal Certificate Sale price¥69,800

[Lottery Sale ②_202608_02] Unheated Kashmir Sapphire 2.6mm/0.110ct Loose Stone GIA Sale price¥79,800

[Listed under 12563270] South African rough diamond (sawable) 0.477ct Sale price¥178,000

[Lottery Sale 0718_05] Unheated Australian Teal Blue Sapphire 1.010 ct Loose GIA Sale price¥128,000

Violet Sapphire 4.3mm/0.328ct Loose Sale price¥15,800

[Lottery Sale 0707_10] Unheated Montana Sapphire (Yogo Mine) 0.173ct Loose Stone with Japan-Germany Gemological Report Sale price¥98,000

[Lottery Sale 0725_05] Madagascar Teal Blue Sapphire 0.748ct Loose Stone with Appraisal Sale price¥28,800

Colombian Trapiche Emerald 0.372ct Loose Sale price¥18,800

Russian rough diamond (sawable) 0.098ct loose Sale price¥22,800

[Available 9/9 at 10 PM] [Color-Free] Pt900 Diamond 1.00ct V-Shape Ring Sale price¥128,000

【Available 9/9 at 10 PM】【Colori】Pt900 Opal 1.10ct Diamond 0.46ct Ring Sale price¥98,000

K18WG オーロラ天女・アコヤ真珠（アコヤパール）ダイヤモンドブローチ真科研鑑

[Available 9/5 at 10 PM] 18K White Gold Aurora Tennyo Akoya Pearl and Diamond Brooch, with Pearl Science Laboratory Certificate Sale price¥98,000

[Available 9/15, 10 PM] [Colorfry] Pt850 Cross-Shape Pearl Earrings with Appraisal Certificate Sale price¥18,800

[On Sale 9/14, 10:00 PM] [Colorifi] Pt900 Ruby 0.71ct / Diamond 0.24ct Ring with Appraisal Report Sale price¥98,000

[Available 9/4 at 10 PM] Ruby 0.411ct Loose Stone Sale price¥18,800

【9/4 10:00 PM Sale】Ruby 0.200ct Loose Stone Sale price¥12,800

[Available 9/4 at 10 PM] Ruby 0.141ct loose stone Sale price¥9,800

【Available 9/6 at 10 PM】 Tanzanian Windsor Sapphire (Purple Sapphire) 0.277ct Loose Gemstone Sale price¥12,800

タンザニア産ウィンザーサファイア（カラーチェンジサファイア） 0.261ctルース

【9/12 22:00 Release】 Tanzanian Windsor Sapphire (Color Change Sapphire) 0.261ct Loose Gemstone Sale price¥9,800

[Available 9/11 at 10 PM] Sri Lankan Purple Sapphire 0.271ct Loose Gemstone with Identification Report Sale price¥18,800

Amazon Green Opal 0.814ct Loose (Faceted Cut) Sale price¥7,980

Amazonian green opal 0.517ct loose stone (faceted cut) Sale price¥7,980

Amazon Green Opal 0.285ct Loose (Faceted Cut) Sale price¥6,980

Brazilian copper rutilated quartz 1.334ct loose stone Sale price¥8,800

[Lottery Sale 0731_06] Colombian Pyrite in Emerald 2.988 ct Loose Stone with Japanese and German Gemological Certificates Sale price¥228,000

[Lottery Sale 0731_10] Colombian Muzo Non-Oil Emerald 0.370ct Loose GIA Sale price¥298,000

[Lottery Sale 0818_07] Madagascar Bi-Color Sapphire 1.870ct Loose Stone with Gem Identification Report Sale price¥79,800

[Lottery Sale 0825_10] Colombian Non-Oil Emerald 0.090ct Loose GIA Sale price¥128,000

[Lottery Sale 0812_18] Zambian Non-Oil Emerald 0.540ct Loose GIA Sale price¥178,000

Pt900/Pt850 ピンクトルマリン 1.10ct ダイヤモンド0.02ctペンダント（ネックレス）鑑別書

[22602719 Posted] [Calafuri] Pt900/Pt850 Pink Tourmaline 1.10ct Diamond 0.02ct Pendant (Necklace) with Certificate Sale price¥98,000

K18WG アレキサンドライト 0.32ct ダイヤモンド0.29ctペンダントトップ（ネックレストップ）鑑別書

[Listed in 22602716] [Colorfuri] K18WG Alexandrite 0.32ct Diamond 0.29ct Pendant Top with Certificate Sale price¥128,000

K18WG アレキサンドライト 0.64ct ダイヤモンド0.04ctペンダントトップ（ネックレストップ）鑑別書

[Published in 22602715] [Colorful] K18WG Alexandrite 0.64ct Diamond 0.04ct Pendant Top (Necklace Top) with Identification Report Sale price¥228,000

Pt900 グロッシュラーガーネット 1.31ct ダイヤモンド0.24ctリング鑑別書

[Published as 22602712] [Colorful] Pt900 Grossular Garnet 1.31ct Diamond 0.24ct Ring with Appraisal Report Sale price¥128,000

[Available 8/30 at 10 PM] Colombian Mint Color Emerald 0.359ct Loose Stone Sale price¥12,800

[8/30 10:00 PM Release] Mexican Fire Opal 0.352ct Loose Stone Sale price¥7,980

【#202607 Akihabara Pop-up Store - Currently Removed from Stock】【Listed on 12563192】Unheated Ruby 0.210ct Loose Stone Sale price¥62,800

【#202607 Akihabara Pop-up Store - Currently Removed】【Listed as 12563268】Rough Diamond (Sawable) from South Africa 0.271ct Sale price¥88,800

【#202607 Akihabara Pop-up Store - Currently Removed from Stock】【12563063 Listed】Padparadscha Sapphire 0.619ct Loose Stone Sale price¥138,000

Royal blue sapphire 1.220ct loose stone Sale price¥258,000

[Lottery Sale ②_202608_08] Unheated Color Change Sapphire from Sri Lanka 1.140ct Loose Stone GIA Sale price¥258,000

[#202607AkihabaraPop-upExhibition][12563418Posted] Burmese Ruby 0.303ct Loose Sale price¥9,800

【#202607 Akihabara Pop-up, Currently Out of Office】【12563057 Listed】Sri Lankan Royal Blue Sapphire 1.060ct Loose Stone Sale price¥188,000

Brazilian copper rutilated quartz 1.262ct loose stone Sale price¥6,980

Brazilian copper rutilated quartz 1.647ct loose stone Sale price¥6,980

Brazilian copper rutilated quartz 1.352ct loose stone Sale price¥6,980

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.