![[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/collage_f4ce5d64-8804-46cd-8a67-6e5dfa2be8a9.png?v=1785924412&width=4000)
![[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 23rd at 10 PM] Limited 10 Stones! Amethyst Gacha featuring Koshu-Kiseki-Kiriko-plus-three "Akatsuki" (with one citrine cut by Mr. Sandje) [Multiple Purchase Discount Available]](http://store.karatz.jp/cdn/shop/files/collage_f4ace2f9-5fe7-4ba7-ad87-22a174e398a0.png?v=1787354382&width=2000)
![[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]](http://store.karatz.jp/cdn/shop/files/P1010374_a19b207f-12e5-4ee0-b72b-39e70511ba5b.jpg?v=1783557559&width=4000)
![[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)
![[On sale August 21st, 10 PM] "Limited to 20 stones" Sri Lankan Ratnapura Green Zircon Single Stone Loose Gemstone "Bulk purchase discount available"](http://store.karatz.jp/cdn/shop/files/P8070258.jpg?v=1787095598&width=4000)
![[On sale August 14th, 10 PM] Limited 10 pieces: Zimbabwe Mint Fluorite Single Stone Loose (average 2.2ct) [Bulk purchase discount available]](http://store.karatz.jp/cdn/shop/files/collage_c70b65a7-64c4-4d4b-a6be-3d893c5cc2ad.png?v=1786091316&width=2000)
Tibetan bicolor andesine 0.755ct loose stone
Sale price¥6,980
Pakistani Aragonite 2.879ct loose stone
Sale price¥8,800
![[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】マダガスカル産サファリン 0.164ctルース 鑑別書
Sale price¥12,800
【8/30 22時販売】マダガスカル産サファリン 0.145ctルース 鑑別書
Sale price¥11,800
【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】ジンバブエ産スフェーン 0.302ctルース
Sale price¥8,800
【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】ジンバブエ産スフェーン 0.332ctルース
Sale price¥9,800
【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
【8/29 22時販売】マダガスカル産アンダリュサイト 0.454ctルース
Sale price¥7,980
【8/29 22時販売】タンザニア産パープルスピネル 0.751ctルース
Sale price¥18,800
【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
【8/29 22時販売】タンザニア産ミントガーネット 0.296ctルース
Sale price¥8,800
【8/29 22時販売】ブラジル産ラベンダークォーツ（スコロライト） 0.475ctルース
Sale price¥7,980
[Camellia cut] Mexican fire opal 1.270ct loose with patch
Sale price¥69,800
[12553609] Swiss Blue Topaz 3.230ct Loose
Sale price¥25,800
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.