![[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 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)
【Sale starts 8/25 10 PM JST】Synthetic Rutile 0.344ct Loose Gemstone
Sale price¥8,800
[Sale on August 27th at 10 PM] Synthetic Rutile 0.566ct Loose Stone
Sale price¥9,800
![[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)
![[Sale starts August 21st, 10 PM JST] Limited 6 stones: Sri Lankan Uba Moonstone (round buff top cut, 6mm) - Multi-purchase discount available](http://store.karatz.jp/cdn/shop/files/P8070234.jpg?v=1787050510&width=4000)
![[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 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)
American Herkimer Diamond (Rock Crystal) 5.5mm/0.534ct Loose
Sale price¥8,800
American Herkimer Diamond (Rock Crystal) 5.3mm/0.594ct Loose
Sale price¥7,980
![[Sales start 8/13 10 PM] Limited to 12 Stones! Beryl Gacha where you can win a 12mm camellia-cut Limonite in Beryl or Santa Maria Aquamarine with a certificate of authenticity for 45,800 yen. (Multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_42474086-f487-4265-a1d0-33fa7887cdea.png?v=1786090469&width=2000)
![[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 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)
![[Sale starts July 7 at 10 PM] Limited to 14 Stones: Special Cut Gacha [Bulk Purchase Discount Available]](http://store.karatz.jp/cdn/shop/files/75.png?v=1785113154&width=2268)
![[Limited to 24 stones] Oregon Sunstone from America with beautiful Schiller (Oval cut, 5 x 7mm) [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/collage_50cccb1a-7282-4487-ae6d-b6447e9885ee.png?v=1785119892&width=3000)
![[Sale starts 10PM on July 12] Limited 20 Stones: Grandidierite Single Stone Loose (Avg. 0.035ct) from Madagascar [Multiple Purchase Discount Available]](http://store.karatz.jp/cdn/shop/files/P1010194_ea02faf6-d812-4758-9e0c-262e6891b700.jpg?v=1783773075&width=4000)
![[Sale on 7/ at 10 PM] "Limited to 13 Stones" Madagascar Sapphirine, average 0.09ct "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/P1010288_ec4000a1-014e-44e1-9b97-40f834b9e6e7.jpg?v=1783494963&width=4000)
Brazil Color Change Fluorite 1.099ct Loose Stone
Sale price¥9,800
Apatite from Madagascar 0.608ct Loose Stone
Sale price¥8,800
Kochi Prefecture Aka Sango (Red Coral) 1.439ct Loose Stone
Sale price¥9,800
Kochi Prefecture-produced red coral 0.978ct loose stone
Sale price¥9,800
Kochi Prefecture Aka珊瑚 (Red Coral) 1.128ct Loose Stone
Sale price¥9,800
Kochi Prefecture-sourced deep red coral, 1.238ct loose stone
Sale price¥9,800
Kochi Prefecture Blood Coral 1.286ct Loose Stone
Sale price¥9,800
Australian Rainbow Lattice Sunstone 0.850ct Loose Stone
Sale price¥8,800
Australian rainbow lattice sunstone, 0.352 ct, loose
Sale price¥8,800
Tanzanian Bicolor Zoisite 0.255ct 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.