![[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/2026-06-0412.31.27.png?v=1780543913&width=1282)
![[Lottery Sale 0531_03] Unheated Kashmir Sapphire 2.7mm/0.090ct Loose GIA](http://store.karatz.jp/cdn/shop/files/P5291715_55ff6627-3c27-41a7-be3d-dd397633bdd1.jpg?v=1780120018&width=3122)
[Lottery Sale 0531_03] Unheated Kashmir Sapphire 2.7mm/0.090ct Loose GIA
Sale price¥59,800
![[Lottery Sale 0530_06] Internally Flawless Diamond (H&C) 0.527ct Loose Stone (E, IF, 3Excellent H&C)](http://store.karatz.jp/cdn/shop/files/collage_7d52295a-7980-4e98-b7c4-f08bf478023c.png?v=1780016035&width=4000)
![[Selling June 6th at 10 PM] 《Limited to 3 stones》Natural pink diamonds, including fancy colors, regularly ¥59,800 《Multiple purchase discount available》](http://store.karatz.jp/cdn/shop/files/2026-06-0412.23.02.png?v=1780543439&width=1268)
![[On sale June 5 at 10 PM] Limited to 6 Stones: Malawi Moonstone (Malawi-sourced moonstone, average 1.5ct) - Bulk purchase discounts available](http://store.karatz.jp/cdn/shop/files/collage_0839019e-79c8-419f-b9d2-cca6f3b46437.png?v=1780445528&width=4000)
![[Sale 10 PM on June 5] "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose-cut, and mint-colored emeralds, normally priced at 88,800 yen (multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_9d1a1406-da67-4399-8b2e-856792af919c.png?v=1780448032&width=4000)
[Lottery Sale_0612_05] Unheated Kashmir Sapphire 0.120ct Loose Stone GIA
Sale price¥59,800
[Lottery Sale_0612_06] Unheated Kashmir Sapphire 0.220ct Loose Stone GIA
Sale price¥98,000
![[On sale June 7th at 10 PM] Limited to 10 stones: Flower-cut gem gacha 💎 Cherry blossom shape normally 39,800 yen, and a ruby with a new cut (plus an extra new cut) 《Multiple purchase discount available》](http://store.karatz.jp/cdn/shop/files/collage_434c8920-9070-4051-800d-08ef55dca2b6.png?v=1780651117&width=4000)
![[On sale June 8th, 10 PM JST] "Limited to 12 Stones" Garnet Gacha with 8mm Dandelion Cut Rhodolite Garnet (Normally 39,800 yen) "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/43_a7f6b113-3868-4517-a3ff-ed758e3d8035.png?v=1780534972&width=1890)
![[On sale June 6th at 10 PM] Limited to 2 stones: 1 Sri Lankan Dunilite, all stones include a gemological report. (Multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/P1010082_3f95d8ac-2083-42f0-9ee9-e8417efc5044.jpg?v=1780544836&width=3420)
[Lottery Sale_0612_09] Yellow Sapphire 2.150ct Loose Gemstone GIT
Sale price¥158,000
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.