Birthstone list

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

【8/31 22時販売】【カラフリ】Pt900 カラーチェンジサファイア0.446ct ダイヤモンド0.12ctリング鑑別書 Sale price¥89,800

イエローダイヤモンド 0.270ctルース(UNDER N(VERY LIGHT YELLOW), SI-2)

【8/30 22時販売】イエローダイヤモンド 4.0mm/0.270ctルース(UNDER N(VERY LIGHT YELLOW), SI-2) Sale price¥29,800

【8/30 22時販売】ダイヤモンド 4.4mm/0.309ctルース(D, VVS-1, 3Excellent) Sale price¥79,800

【8/30 22時販売】コロンビア産ミントカラーエメラルド 0.359ctルース Sale price¥12,800

【8/30 22時販売】メキシコ産ファイアオパール 0.352ctルース Sale price¥7,980

【8/29 22時販売】タンザニア産ミントガーネット 0.296ctルース Sale price¥8,800

[Camellia cut] Mexican fire opal 1.270ct loose with patch Sale price¥69,800

【#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

マダガスカル産ベキリーブルーガーネット（カラーチェンジガーネット） 0.284ctルース

【#202607 Akihabara Pop-up, Currently Out of Stock】【12563254 Listed】Madagascar Bekily Blue Garnet (Color Change Garnet) 0.284ct Loose Sale price¥59,800

マダガスカル産アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.116ctルース

【#202607 Akihabara Pop-up Store - Currently Displayed Off-site】【Listed as 12563184】Madagascar Andesine-Labradorite (Common Name: Rainbow Moonstone) 0.116ct Loose Gemstone Sale price¥14,800

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

Pakistani Peridot 5.2mm/0.562ct Loose Stone Sale price¥9,800

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

[Published on 12563859] Australian black opal, 1.184ct loose stone Sale price¥45,800

[Listing 12563862] Australian Black Opal 1.392ct Loose Sale price¥69,800

【9/1 22時販売】コロンビア産エメラルド 0.123ctルース Sale price¥18,800

【9/1 22時販売】アメリカ産ペリドット 1.280ctルース Sale price¥18,800

Sold out

【9/1 22時販売】アメリカ産ペリドット 0.803ctルース

【9/1 22時販売】タンザニア産ツァボライト 0.366ctルース Sale price¥13,800

【9/1 22時販売】アフガニスタン産ミントカラートルマリン 0.290ctルース Sale price¥14,800

【9/1 22時販売】ブラジル産パライバトルマリンインクォーツ 4.3mm/0.327ctルース Sale price¥18,800

【9/1 22時販売】ブラジル産パライバトルマリンインクォーツ 2.737ctルース Sale price¥45,800

【9/2 22時販売】マダガスカル産パパラチアサファイア 0.497ctルース DGL鑑 Sale price¥69,800

【9/1 22時販売】ピジョンブラッドルビー 0.350ctルース AIGS Sale price¥49,800

【9/2 22時販売】ピジョンブラッドルビー 0.325ctルース JTL鑑別書 Sale price¥69,800

【9/3 22時販売】スリランカ産パープルサファイア 0.556ctルース鑑別書 Sale price¥55,800

【9/3 22時販売】スリランカ産パープルサファイア 0.376ctルース鑑別書 Sale price¥35,800

【9/3 22時販売】スリランカ産パープルサファイア 0.258ctルース鑑別書 Sale price¥25,800

【9/3 22時販売】YAG（イットリウムアルミニウムガーネット） 5.7mm/0.992ctルース Sale price¥12,800

【9/3 22時販売】スリランカ産ブルーサファイア 0.451ctルース鑑別書 Sale price¥29,800

Russian rough diamond (sawable) 0.101ct loose Sale price¥22,800

[Posted as 12563267] Rough Botswana Diamond (Sawable) 0.140ct Sale price¥44,800

[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available] Sale price¥3,980

[Lottery Sale ②_202608_10] Yellow Sapphire 2.190ct Loose GIT Sale price¥158,000

【Lottery Sale ②_202608_15】Tanzanian Chrome Tourmaline 2.271ct Loose Stone Sale price¥98,000

[Featured in 12563725] Sri Lankan Pink Sapphire 0.319ct Loose Sale price¥29,800

[Published 22602679] [Calafuri] Pt900 Thai Ruby 1ct Ring Sale price¥298,000

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.