Sale

[Listed as 12563733] Tanzania Red Spinel 0.241ct Loose Stone Sale price¥43,800

[Published as 12563759] Tanzanian Ayanad Spinel (Hot Pink Spinel) 0.181ct Loose Gemstone Sale price¥25,800

[Posted on 12563864] Australian Black Opal 1.797ct Loose Stone Sale price¥69,800

[Listed as 12563903] Tanzanian Bicolor Zoisite 1.382ct Loose Stone Sale price¥45,800

[Listed as 12563918] Sri Lankan Purple Sapphire 0.730ct Loose Stone Sale price¥55,800

Brazilian Alexandrite 0.105ct Loose Stone [Listed under 12563842] Sale price¥29,800

[Posted 12563878] Green Hauyne from Afghanistan, 0.222 ct Loose Stone Sale price¥79,800

[On sale July 10 at 10 PM] Limited 8 stones: Sweet Home Mine rhodochrosite single loose stone (average 0.1 ct) [Multiple purchase discount available] Sale price¥2,980

[On sale July 20th at 10 PM] "Limited to 13 Stones" Diamond Gacha: Win a FANCY VIVID Yellow Diamond (with sorting report) worth 22,800 yen. One loose stone. (Multiple purchase discount available.) Sale price¥2,580

[Lottery Sale 0812_17] Unheated Burmese Jedi Spinel 0.430ct Loose Gemstone GUILD Sale price¥118,000

Pt900/K18 ルビー 0.28ct・ダイヤモンド0.20ct リング鑑別書

【#202607 Akihabara Pop-up Store - Currently Displayed Off-site】【On Sale June 22nd at 10 PM】【Colorfully】Pt900/K18 Ruby 0.28ct, Diamond 0.20ct Ring with Appraisal Sale price¥98,000

Brazilian Euclase (Bicolor Euclase) 0.302ct Loose Stone Sale price¥45,800

[12552852] Citrine 2.734ct loose stone Sale price¥22,800

[12555446] White topaz 3.619ct loose stone Sale price¥8,800

[Lottery Sale 1_202608_04] Pt900 Benitoite (USA) 0.152ct / Diamond 0.58ct Ring Sale price¥188,000

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

[Lottery Sale ①_202608_12] Internally Flawless Diamond 0.300 ct Loose (D, IF) GIA Sale price¥118,000

[Lottery Sale ②_202608_16] Loose Brazilian Parti-Color Tourmaline 15.355ct Sale price¥39,800

K18WG パライバトルマリン 0.09ct・ダイヤモンド0.06ctリング（CuO:1.0%、MnO:0.4%）ソーティング（一般社団法人宝石貴金属協会）

[22602666 listed] [Colorful] K18WG Paraiba Tourmaline 0.09ct Ring Sale price¥198,000

[Item ID: 22602669] [Karafuri] Pt900 Ruby 0.58ct Ring Sale price¥98,000

[Published 22602698] [Karafuri] K18 Ruby 6.74ct Ring Diamond 0.91ct with identification report Sale price¥228,000

Colombian Euclase 0.546ct Loose Stone Sale price¥25,800

【12562828掲載】コロンビア産パイライト付ユークレース 37.340ct原石

Euclase with Pyrite from Colombia 37.340ct Rough Gemstone (Hokikyosho) Sale price¥12,800

[On sale May 11th at 10 PM] Bi-color Euclase from Zimbabwe, 0.152ct loose stone Sale price¥19,800

[12558559] Zimbabwe bicolor euclase rough stone 0.744ct Sale price¥39,800

American Herkimer Diamond (Rock Crystal) 5.5mm/0.534ct Loose Sale price¥8,800

American Herkimer Diamond (Rock Crystal) 5.3mm/0.594ct Loose Sale price¥7,980

Lottery Sale ⑧ [For Winners Only] [Listed as 12563226] Kochi Prefecture Boke Coral (Sango) 7.900ct Loose Stone Sale price¥59,800

【Lottery Sale ①_202608_05】K18WG Diamond 0.50ct Half Eternity Ring Sale price¥128,000

コロンビア産パイライト・雲母インエメラルド 5.5mm/0.614ctルース鑑別書

[Published on 12563914] Loose Colombian Pyrite and Mica in Emerald, 0.614 ct Sale price¥45,800

[Item 12564087] Kochi Prefecture Boke Coral (Sango) 15.237ct Loose Stone Sale price¥69,800

カメレオンダイヤモンド 0.212ctルース(LIGHT BROWNISH GREENISH YELLOW（カメレオン）, SI-1)

[Published on 32501973] Chameleon Diamond 0.212ct Loose (LIGHT BROWNISH GREENISH YELLOW (Chameleon), SI-1) Sale price¥64,800

オレンジダイヤモンド 0.348ctルース(FANCY VIVID YELLOW ORANGE, VS-1)

[Featured in 32501971] Orange Diamond 0.348ct Loose Stone (FANCY VIVID YELLOW ORANGE, VS-1) Sale price¥128,000

イエローダイヤモンド 0.144ctルース(FANCY VIVID YELLOW, SI-2)

Yellow Diamond 0.144ct Loose (FANCY VIVID YELLOW, SI-2) [Listed as 32501969] Sale price¥55,800

[Listed as 12564020] Hackmanite 0.300ct Loose Stone Sale price¥59,800

【12548939掲載】マダガスカル産ラズライトインクォーツ 1.600ctルース

Lazurite in quartz from Madagascar 7.5mm/1.600ct loose Sale price¥18,800

Brazilian bicolor tourmaline 7.489ct loose Sale price¥39,800

ファンシーディープイエローダイヤモンド 3.6mm/0.190ルース(FANCY DEEP ORANGY YELLOW, SI2)

【#202607AkihabaraPopUpTakeOut】90002505NewYearLuckyBag2025_【On sale Dec 14, 10 PM JST】Fancy Deep Yellow Diamond 3.6mm/0.190ct Loose (FANCY DEEP ORANGY YELLOW, SI2) Sale price¥39,800

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) Sale price¥55,800

[#202607 Akihabara Pop-up Store - Currently Removed from Stock] [12563475 Posted] Mahenge Spinel (Pink Spinel) from Tanzania 0.492ct Loose Stone Sale price¥49,800

[#202607 Akihabara Pop-up Store - Currently Displayed] [12563067 Listed] Padparadscha Sapphire 0.649ct Loose Stone Sale price¥128,000

[Lottery Sale 0628_08] Unheated Kashmir Sapphire 0.160ct Loose GIA Sale price¥98,000

ダイヤモンド 4.45mm/0.324ctルース(D, VVS1, 3Excellent) GIA&中宝

[Lottery Sale 1_202608_11] Diamond 4.45mm/0.324ct Loose (D, VVS1, 3Excellent) GIA & CBT Sale price¥98,000

ダイヤモンド 4.42mm/0.330ctルース(E, VS1, 3Excellent) GIA

【Lottery Sale ①_202608_10】Diamond 4.42mm/0.330ct Loose (E, VS1, 3Excellent) GIA Sale price¥98,000

インターナリーフローレスダイヤモンド（H&C） 3.9mm/0.215ctルース(E, IF, 3Excellent H&C) GIA

[Lottery Sale ①_202608_09] Internally Flawless Diamond (H&C) 3.9mm/0.215ct Loose (E, IF, 3Excellent H&C) GIA Sale price¥75,800

[Item 12564022] Tanzanian Mint Diopside 0.794ct Loose Stone Sale price¥22,800

Zoisite from Tanzania, 0.643 ct loose Sale price¥18,800

[Listed as 12564065] Brazilian Tourmaline Cat's Eye 0.689ct Loose Gemstone Sale price¥11,000

[Published as 12564054] Kochi Prefecture Coral 8.132ct Loose Stone Sale price¥69,800

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.