0.3ct - 0.5ct

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[Lottery Sale 0731_07] Unheated Montana Sapphire (Yogo Mine) 0.186ct Loose Stone with Japan-Germany Gemological Analysis Report

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【#202607 Akihabara Pop-up, Currently Out of Stock】【12563269 Posted】Rough Diamond (Sawable) from South Africa 0.280ct

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#202607 Akihabara Pop-up Store (currently out of office) #12563139 Listed: Brazilian Santa Maria Aquamarine, 0.339ct Loose Stone

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[#202607 Akihabara Pop-up Store Carry Out] [12559782 Listed] Hackmanite 0.142ct Loose

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Sphene from Brazil (Fana-ginho), 0.476 ct, with laboratory report

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[On sale August 2nd at 10 PM] Colombian pyrite and mica-in-emerald 0.271ct loose stone with gemological report

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[On sale August 1st, 10 PM JST] Brazilian Rubellite 4.3mm/0.285ct Loose Stone with Certification

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0.159 ct Loose Padparadscha Sapphire from Madagascar, Central Gem Laboratory certified

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Madagascar Padparadscha Sapphire 4.0mm/0.305ct Loose Gem, Central Gemological Laboratory

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0.278ct Alexandrite Loose Stone from Orissa, India, with Japan-Germany Gemological Report

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[Sale on Aug 1st at 10 PM] Afghan Hauyne 0.185ct Loose Stone with Certificate

coming soon

【12563839掲載】ブラジル産バイカラーピンクユークレース 0.224ctルース

[Lottery Sale 0829] Brazilian Bicolor Pink Euclase 0.224ct Loose Stone Sale price¥79,800

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【12563376 listed】Euclase from Zimbabwe 0.101ct Loose

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[12562256 listed] American Neptunite 0.199ct Loose

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[Listed as 12563398] Brazilian Alexandrite 0.220ct Loose Stone

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【Posted on 12562262】Brazilian Santa Maria Aquamarine 0.361ct Loose Stone

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[12563504 Listed] Unheated Pigeon Blood Ruby from Burma 0.300ct Loose

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0.294ct Loose Australian Rainbow Lattice Sunstone

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Mozambique Ruby 0.226ct Loose

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Tanzanian Kornerupine, 0.196 ct Loose

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Tanzanian Green Zoisite 0.375ct Loose Stone

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Brazilian Alexandrite 0.290ct Loose Stone GIA

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0.400ct Unheated Color Change Sapphire from Burma (Myanmar) - GIA

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Burmese unheated color change sapphire 0.440ct loose GIA

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0.481ct Loose Pink Grossular Garnet from Myanmar, with Japan-Germany Gemological Report

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0.101ct Maw Sit Sit Loose Stone from Myanmar, Nichidoku Identification

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Myanmar Painite 0.242ct Loose Gemstone, Nichidoku certified

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Madagascar Grandidierite 0.179ct Loose Stone with Certificate

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0.171ct Loose Grandidierite from Madagascar with certification

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0.393ct Loose Neon Blue Apatite from Madagascar

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Madagascar Neon Blue Apatite 0.364ct Loose

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ミャンマー産グレースピネル（プラチナスピネル） 4.2mm/0.385ctルース

Burmese grey spinel (platinum spinel) 4.2mm/0.385ct loose gemstone

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Loose Colombian emerald, 0.135 ct, Hōki Kyō (Japan Gem Laboratory)

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[Lottery Sale 0409_04] Burmese Taaffeite 3.0mm/0.128ct Loose Stone with Appraisal

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【Lottery Sale 0409_01】Myanmar Taaffeite 3.3mm/0.152ct Loose Stone with Certificate

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Burmese ruby 3.1mm/0.120ct loose stone with gemological report

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0.300 ct Loose Mozambique Ruby with Certificate

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Kashmir unheated sapphire 0.350ct loose stone GIA

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Sri Lankan Blue Sapphire 4.0mm/0.269ct Loose with Certificate

coming soon

[#202607 Akihabara Pop-up Store - Currently Removed from Stock] [Listed as 12563479] Madagascar Alexandrite 0.450ct Loose Sale price¥118,000

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0.415ct Mozambique Ruby Loose Stone with Gemstone Identification Report

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Madagascar Padparadscha Sapphire 3.5mm/0.206ct Loose, Central Gem Laboratory

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Benitoite from the USA, 3.1mm/0.129ct loose stone, with a certificate of authenticity.

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U.S. Benitoite 0.262ct Loose Gemstone with Certificate

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0.221ct Loose Padparadscha Sapphire from Madagascar, accompanied by a Central Gem Laboratory certificate

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Padparadscha Sapphire 3.9mm/0.282ct Loose DGL

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American Neptunite 4.0mm/0.224ct Loose Gemstone with Certificate

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Brazilian Bi-color Paraiba Tourmaline 0.190ct Loose (CuO: 2.06% MnO: 1.31%) with Japan-Germany Gemological Analysis Report

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.