![[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/collage_7b7dc323-95d7-4adf-b87d-7f158eb4b182.png?v=1787295459&width=2000)
![[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 8/15 at 10 PM JST] Colombian Emerald Gacha featuring Shimizu Kisaki's 8mm Clover In-cut (regularly 79,800 JPY) - only 15 stones available! (Bonus green beryl included) [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/81.png?v=1785982219&width=1890)
![Limited to 10 stones: Madagascar pink sapphire (heart-shaped, including padparadscha color, approximately 3 x 2.3 mm) [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/collage_af0c773f-5960-4051-9ae9-82d3098c4584.png?v=1787791015&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)
【8/30 22時販売】《残り3石》コロンビア産エメラルド原石（平均0.25ct）《複数購入割引有》
Sale price¥7,980
【8/29 22時販売】《限定11石》コロンビア・ムゾー産エメラルド原石（平均0.20ct）《複数購入割引有》
Sale price¥5,980
![[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)
![[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]](http://store.karatz.jp/cdn/shop/files/P8200827.jpg?v=1787563629&width=4000)
![[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]](http://store.karatz.jp/cdn/shop/files/P8200767.jpg?v=1787563557&width=4000)
![[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
【8/30 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
【8/30 22時販売】ブルーサファイア 0.176ctルース
Sale price¥14,800
【8/30 22時販売】ブルーサファイア 0.148ctルース
Sale price¥8,800
[Camellia cut] Mexican fire opal 1.270ct loose with patch
Sale price¥69,800
Royal blue sapphire 1.220ct loose stone
Sale price¥258,000
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】ピジョンブラッドルビー 0.350ctルース AIGS
Sale price¥49,800
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]](http://store.karatz.jp/cdn/shop/files/P8190691.jpg?v=1787563399&width=4000)
[Lottery Sale ②_202608_10] Yellow Sapphire 2.190ct Loose GIT
Sale price¥158,000
[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
![[Published on 22602652] [Colorful] K18 Synthetic Opal Pendant Top](http://store.karatz.jp/cdn/shop/files/collage_a6b9c743-f455-4833-96ce-6fd9b0d6dd4b.png?v=1787359048&width=2000)
[Published on 22602652] [Colorful] K18 Synthetic Opal Pendant Top
Sale price¥16,800
【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
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.