![[Available 9/4 at 10 PM] 《16 Stones Limited》 Colombian Emerald Raw Stones (Average 0.35ct) 《Multiple Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/collage_c08fd04c-cb40-4b64-8210-7094d07ed197.png?v=1788334930&width=2000)
![[8/29 10 PM Sale] <<11 Stones Only>> Raw Emerald from Muzo, Colombia (Avg. 0.20ct) <<multi-purchase discount available>></multi-purchase>](http://store.karatz.jp/cdn/shop/files/collage_8a983e9d-ab06-40f8-8ca8-32257c5ebc00.png?v=1787903111&width=2000)
![[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 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)
![[Available 10/3 at 10 PM] <limited to stones> Mexican Cantera Opal Gacha - 1 Loose Stone (Avg. 2.5ct) <multi-purchase discounts available></multi-purchase></limited>](http://store.karatz.jp/cdn/shop/files/P9250397.jpg?v=1790400242&width=4000)
![[Limited to 6 stones] Contains 2 stones in total: 1 gemstone (rough stone) that is actually featured in a gemstone encyclopedia + 1 emerald rough stone.](http://store.karatz.jp/cdn/shop/files/collage_5fd345f1-1646-43a1-b347-1e83dd089a63.png?v=1751925957&width=2000)
13-stone diamond half eternity ring set (VS class, D-G color, H&C, 2.0mm)
Sale price¥158,000
![[On sale 9/4 at 10:00 PM] 《Limited to 7 stones》 Colombian mint-colored emerald rough (average 0.51ct) 《Multi-buy discount available》](http://store.karatz.jp/cdn/shop/files/collage_4a80269b-3a4f-4b51-bce8-58c65252f527.png?v=1788335435&width=2000)
[Lottery Sale 0521_08] Madagascar Sapphire 1.650ct Loose GIA
Sale price¥158,000
1.758 ct Ruby Loose Stone from Vietnam with Identification Report
Sale price¥49,800
![[Option] Laser engraving of characters and symbols](http://store.karatz.jp/cdn/shop/files/P1077557_4673644f-2ddc-409f-a474-c35d30597167.jpg?v=1774858787&width=4000)
[Option] Laser engraving of characters and symbols
Sale price¥5,000
Yellow diamond 0.188ct loose (FANCY INTENSE YELLOW, VS1)
Sale price¥47,800
Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity
Sale price¥39,800
Opal 0.123ct loose stone
Sale price¥5,980
Mexican Hyalite Opal 2.592ct loose
Sale price¥9,800
Colombian emerald 3.5mm/0.150ct loose stone
Sale price¥22,800
Burmese Ruby 0.418ct Loose Stone Japan-Germany
Sale price¥29,800
Myanmar Ruby 0.283ct Loose
Sale price¥25,800
Emerald 0.484ct loose
Sale price¥7,980
![[10/3 (Sat) 10:00 AM Deadline: Lottery Sale ①_03] Diamond (H&C) 4.5mm/0.353ct Loose Stone (E, VS-2, 3Excellent H&C) Includes CGL Report & Sarine Light Report](http://store.karatz.jp/cdn/shop/files/collage_7353bfb2-13a0-4dee-a51b-4d82f013cf8b.png?v=1790579200&width=2000)
![[10/3 (Sat) 10:00 AM Deadline: Lottery Sale ①_04] Diamond (H&C) 4.5mm/0.345ct Loose Stone (G, VS-2, 3Excellent H&C) CGL Certified](http://store.karatz.jp/cdn/shop/files/collage_b787ec7d-3be5-4131-a28c-bb00fd5e56d4.png?v=1790579244&width=2000)
Australian Black Opal 0.386ct Loose Stone
Sale price¥29,800
Sri Lankan Blue Sapphire 0.226ct Loose
Sale price¥14,800
Mexican Fire Opal 0.780ct Loose
Sale price¥12,800
Diamond (cabochon cut) 0.183ct loose
Sale price¥24,800
Kenyan Gold Sheen Sapphire 3.6mm/0.302ct Loose Stone
Sale price¥29,800
Kenyan Gold Sheen Sapphire 3.5mm/0.273ct Loose Stone
Sale price¥19,800
Colombian Trapiche Emerald 1.494ct Loose
Sale price¥69,800
【11/5 22時販売】【カラフリ】Pt850 ダイヤモンド 1.0ct ブレスレット鑑別書
Sale price¥128,000
【11/2 22時販売】スリランカ産ブルーサファイア 0.518ctルース 鑑別書
Sale price¥29,800
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.