Brazilian alexandrite 0.061ct loose
Sale price¥12,800
Brazilian alexandrite 0.051ct loose
Sale price¥9,800
Salt and pepper diamond 0.446ct loose
Sale price¥39,800
Goshenite 6.1mm/0.905ct loose stone
Sale price¥7,980
Mozambique Pink Sapphire 0.276ct Loose (Hot Pink Sapphire)
Sale price¥9,800
![[On Sale June 6th at 10 PM] 《Only 1 Stone Left》Sri Lankan Dunilite, All Stones Come with a Gemstone Identification Report 《Bulk Purchase Discount Available》](http://store.karatz.jp/cdn/shop/files/P1010082_3f95d8ac-2083-42f0-9ee9-e8417efc5044.jpg?v=1780544836&width=3420)
[On sale May 10th, 10 PM JST] Madagascar Andalusite 2.187ct Loose Stone
Sale price¥32,800
Diamond 3.4mm/0.144ct loose stone (I, VS1, Good)
Sale price¥16,800
Pink Diamond 0.075ct Loose (Fancy Purplish PINK, SI2)
Sale price¥98,000
Diamond 0.171ct loose stone (E, VS2, radiant cut)
Sale price¥35,800
Diamond 3.0mm/0.123ct loose stone (D, VS2, octagonal cut)
Sale price¥28,800
![[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 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)
![[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)
Chameleon Diamond Green Diamond 0.122ct Loose (FANCY GRAY GREEN, SI2)
Sale price¥69,800
Russian rough diamond (sawable) 0.117ct loose
Sale price¥29,800
South African diamond rough (sawable) 0.110ct rough
Sale price¥22,800
Mexican Opal 0.499ct Loose
Sale price¥3,980
Bicolor Zoisite 1.100ct Loose Stone (Bicolor Tanzanite)
Sale price¥18,800
Mexican Opal 0.854ct Loose
Sale price¥5,980
Sky blue topaz 1.051ct loose stone
Sale price¥8,800
American red beryl 0.143ct loose
Sale price¥35,800
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.