![[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.)](http://store.karatz.jp/cdn/shop/files/collage_e8634dba-e7a3-4862-b6b3-003b0b13375c.png?v=1786839952&width=2000)
![[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"](http://store.karatz.jp/cdn/shop/files/2026-08-2115.28.22.png?v=1787293728&width=1285)
![[On sale August 12th at 10 PM] "Limited to 15 Stones" Diamond Gacha featuring rare butterfly-cut diamonds "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/2026-08-0717.06.55.png?v=1786090036&width=1279)
![[22602719 Posted] [Calafuri] Pt900/Pt850 Pink Tourmaline 1.10ct Diamond 0.02ct Pendant (Necklace) with Certificate](http://store.karatz.jp/cdn/shop/files/P8201335_0b8bc033-b13e-40fc-811d-d23e8ce639ce.jpg?v=1787965565&width=2870)
![[Listed in 22602716] [Colorfuri] K18WG Alexandrite 0.32ct Diamond 0.29ct Pendant Top with Certificate](http://store.karatz.jp/cdn/shop/files/collage_a2330eb3-6c4f-41e4-a644-3ee675d8ef48.png?v=1787965364&width=2000)
![[Published in 22602715] [Colorful] K18WG Alexandrite 0.64ct Diamond 0.04ct Pendant Top (Necklace Top) with Identification Report](http://store.karatz.jp/cdn/shop/files/collage_d65e1552-d979-4aeb-b60e-a5ba3ca1b2ad.png?v=1787965124&width=2000)
![[Published as 22602712] [Colorful] Pt900 Grossular Garnet 1.31ct Diamond 0.24ct Ring with Appraisal Report](http://store.karatz.jp/cdn/shop/files/P8190116_8f2918b4-96e0-4f40-ae59-160857a6b0b4.jpg?v=1787964834&width=4000)
【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
【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
【8/29 22時販売】ロシア産デマントイドガーネット（ホーステール認む） 2.7mm/0.093ctルース
Sale price¥14,800
[12553609] Swiss Blue Topaz 3.230ct Loose
Sale price¥25,800
【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
Russian rough diamond (sawable) 0.101ct loose
Sale price¥22,800
[Posted as 12563267] Rough Botswana Diamond (Sawable) 0.140ct
Sale price¥44,800
[Published 22602679] [Calafuri] Pt900 Thai Ruby 1ct Ring
Sale price¥298,000
[Featured in 22602706] [Calafuri] K18WG Turquoise Earrings
Sale price¥24,800
【22602701掲載】【Karafuri】Pt900 Star Sapphire 0.744ct Ring
Sale price¥128,000
[22602704 Posted] [Colorful] Pt900 Mandarin Garnet 1.15ct Pendant Top
Sale price¥110,000
[Listed as 12563196] Imperial Topaz from Brazil, 1.036ct Loose Gemstone
Sale price¥45,800
[Listed as 12563271] Rough Diamond (Sawable) from South Africa, 0.353 ct
Sale price¥128,000
[12563744 listed] Bi-color Tourmaline from Brazil 1.153ct Loose Stone
Sale price¥12,800
[Listed as 12563729] Brazilian Indicolite Tourmaline 0.389ct Loose
Sale price¥38,800
[Posted as 12563742] Brazilian Bicolor Tourmaline, 1.524 ct loose stone
Sale price¥18,800
[12555446] White topaz 3.619ct loose stone
Sale price¥8,800
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.
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.