Login

Out of stock

Sort by
Sold out Golden Hill Turquoise from Kazakhstan, 2.882ct loose stone

Golden Hill Turquoise from Kazakhstan, 2.882ct loose stone
Sold out Golden Hill Turquoise from Kazakhstan, 2.524ct Loose Stone

Golden Hill Turquoise from Kazakhstan, 2.524ct Loose Stone
Sold out [Sakura In-Cut] Sapphire from Ratnapura, Sri Lanka, 6.0mm/0.839ct Loose

[Sakura In-Cut] Sapphire from Ratnapura, Sri Lanka, 6.0mm/0.839ct Loose
Sold out Fun Gem Gacha! 💎 Get diamonds (normally 29,800 yen) (D/VS/3EX H&C with Medium Certificate), special cut Oresund and Unloved, and more! (Multiple purchase discounts available)

Fun Gem Gacha! 💎 Get diamonds (normally 29,800 yen) (D/VS/3EX H&C with Medium Certificate), special cut Oresund and Unloved, and more! (Multiple purchase discounts available)

Sold out [Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

[Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

Sold out 18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring

18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring
Sold out Native Copper (1 rough stone) (average 22 carats) {Multiple purchase discounts available}

Native Copper (1 rough stone) (average 22 carats) {Multiple purchase discounts available}
coming soon ガーデンクォーツ 23.495ctルース

Garden quartz 23.495ct loose Sale price¥3,980
Sold out トリフィライトインクォーツ 13.378ctルース

Triphyllite in quartz 13.378ct loose
Sold out パイライトインクォーツ 34.864ctルース

Pyrite in quartz 34.864ct loose
Sold out スモーキークォーツ 0.691ctルース

[Koshu precious stone Kiriko plusthree] Smoky quartz 6mm/0.691ct loose with patch
Sold out 奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 1.447ctルース

Rainbow garnet (andradite garnet) from Tenkawa Village, Nara Prefecture 1.447ct loose
Sold out Ruby 0.258ct loose

Ruby 0.258ct loose

Sold out 奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 1.665ctルース

Rainbow garnet (andradite garnet) 1.665ct loose from Tenkawa Village, Nara Prefecture
Sold out 奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 1.119ctルース

Rainbow garnet (andradite garnet) from Tenkawa Village, Nara Prefecture 1.119ct loose
Sold out カザフスタン産ストロベリークォーツ 1.536ctルース

Strawberry quartz from Kazakhstan 1.536ct loose
Sold out ブラジル産デュモルチェライトインクォーツ 0.852ctルース

Brazilian dumortierite in quartz 6mm/0.852ct loose
Sold out タンザニア産コーネルピン 0.173ctルース

Cornell pin from Tanzania 3.5mm/0.173ct loose
Sold out フィンランド産ラブラドライト（スペクトロライト） 6.335ctルース

Labradorite (Spectrolite) from Finland 6.335ct loose
Sold out ザンビア産アメジスト 29.357ct原石

Amethyst 29.357ct raw stone from Zambia
Sold out ザンビア産アメジスト 39.112ct原石

Amethyst 39.112ct raw stone from Zambia
Sold out Bicolor tourmaline 3.242ct rough stone from Afghanistan

Bicolor tourmaline 3.242ct rough stone from Afghanistan
Sold out オレゴンサンストーン 0.513ctルース

Oregon Sunstone 0.513ct loose
Sold out 0.278 ct loose Nigerian cobalt gahnite with Japanese and German appraisals

0.278 ct loose Nigerian cobalt gahnite with Japanese and German appraisals
coming soon 【Lottery Sale 0731_08】Brazilian Emerald Cat's Eye 6.083ct Loose Gemstone with Japanese and German Gemological Report

【Lottery Sale 0731_08】Brazilian Emerald Cat's Eye 6.083ct Loose Gemstone with Japanese and German Gemological Report Sale price¥258,000
Sold out Afghanistan Lapis Lazuli 11mm/5.263ct Loose Stone

Afghanistan Lapis Lazuli 11mm/5.263ct Loose Stone
Sold out Mexican Fire Opal (Faceted) 4.5mm/0.218ct Loose Stone

Mexican Fire Opal (Faceted) 4.5mm/0.218ct Loose Stone
Sold out Brazilian Dumortierite in Quartz 1.516ct Loose Gemstone

Brazilian Dumortierite in Quartz 1.516ct Loose Gemstone
Sold out 【12554871掲載】アメジスト 4.193ctルース

[12554871] Amethyst 4.193ct loose stone

coming soon [Lottery Sale 0629_08] Colombian Non-Oil Emerald 4.1mm/0.240ct Loose GIA

[Lottery Sale 0629_08] Colombian Non-Oil Emerald 4.1mm/0.240ct Loose GIA Sale price¥458,000
coming soon 【22602619掲載】K18 血赤珊瑚 0.33ctct ペンダント（ネックレス）

【#202607 Akihabara Pop-up Store - Currently out on loan】【22602619 Listed】K18 Blood Coral 0.33ct Pendant (Necklace) Sale price¥45,800
coming soon 【12562592掲載】中国・四川省産シーライト 1.138ctルース

[#202607 Akihabara Pop-up Out of Office] [12562592 Listed] Scheelite from Sichuan, China, 1.138ct Loose Stone Sale price¥39,800
coming soon 【12563127掲載】ナイジェリア産コバルトガーナイト 0.147ctルース

【#202607 Akihabara Pop-up Store - Currently Removed from Stock】【Listed on 12563127】Nigerian Cobalt Hausmannite 0.147ct Loose Sale price¥22,800
coming soon 【12562677掲載】スリランカ産ブルーサファイア 0.513ctルース

[#202607AkihabaraPopUpTakeout][12562677Listed] Sri Lankan Blue Sapphire 0.513ct Loose Sale price¥22,800
coming soon [#202607 Akihabara Pop-up Store Takeout][Shinjuku Marui Annex 202605 Takeout][12548265 Listed] Padparadscha Sapphire 0.545ct Loose Stone

[#202607 Akihabara Pop-up Store Takeout][Shinjuku Marui Annex 202605 Takeout][12548265 Listed] Padparadscha Sapphire 0.545ct Loose Stone Sale price¥69,800
coming soon 【Sakura Shape】Synthetic Sapphire 8.8mm/3.631ct Loose Stone

【Sakura Shape】Synthetic Sapphire 8.8mm/3.631ct Loose Stone Sale price¥39,800
coming soon 【#202607 Akihabara Pop-up Store Carry-out】【12562676 Listed】Sri Lankan Blue Sapphire 0.501ct Loose Stone

【#202607 Akihabara Pop-up Store Carry-out】【12562676 Listed】Sri Lankan Blue Sapphire 0.501ct Loose Stone Sale price¥29,800
coming soon スライストラピッチェダイヤモンド 0.228ctルース

[#202607 Akihabara Pop-up currently out of office] [Sale starts August 19th, 10 PM JST] Slice Trapiche Diamond 0.228ct Loose Sale price¥18,800
coming soon 【スターインカット】メキシコ産ファイアオパール 7mm/0.678ctルース ワッペン付

[Star in cut] Mexican fire opal 7mm/0.678ct loose patch Sale price¥39,800
coming soon 【#202607 Akihabara Pop-up Items Out for Display】【12555648 Posted】Ludwigite in Peridot from Pakistan 1.624ct Loose

【#202607 Akihabara Pop-up Items Out for Display】【12555648 Posted】Ludwigite in Peridot from Pakistan 1.624ct Loose Sale price¥9,800
coming soon 【12563920掲載】メキシコ産カンテラオパール 5.085ctルース

【12563920 Listed】Mexican Cantera Opal 5.085ct Loose Stone Sale price¥25,800
coming soon 【12563921掲載】メキシコ産カンテラオパール 6.361ctルース

[Sale begins July 29th at 10 PM] Mexican Cantera Opal Loose Stone, 6.361 ct. Sale price¥18,800
Sold out [Lottery Sale 0731_01] Unheated Yellow Star Sapphire from Myanmar 1.004ct Loose Stone with Japan-Germany Gemological Report

[Lottery Sale 0731_01] Unheated Yellow Star Sapphire from Myanmar 1.004ct Loose Stone with Japan-Germany Gemological Report

coming soon [On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*

[On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available* Sale price¥39,800
coming soon [On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available*

[On Sale 10 PM, June 7] *Limited to 3 Sets* 1.0ct/D/VS-VVS/IDEAL Lab-Grown Diamond (Synthetic Diamond) & 2 Rare Cabochon Stones (Total of 3 Stones Included) *Multiple Purchase Discount Available* Sale price¥45,800
Sold out カラーチェンジジルコン 0.626ctルース

Myanmar color change zircon 0.626ct loose stone

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.