![[Sales start 10 PM JST on 3/15] <Limited 5 stones> Lab-grown Alexandrite Gacha (Princess Cut, 3.5-4.5mm) <Multiple purchase discount available>](http://store.karatz.jp/cdn/shop/files/collage_6faadd16-4c1f-45ee-b03d-76a3ad653367.png?v=1771812514&width=2250)
![[On Sale April 7 at 10 PM] [Sakura Shape] Lab-Grown Sapphire 8.8mm/3.631ct Loose Stone](http://store.karatz.jp/cdn/shop/files/20260201_P2058725.jpg?v=1775351168&width=4000)
Synthetic Moissanite 7.999ct loose stone
Sale price¥29,800
Synthetic Moissanite 8.417ct Loose Stone
Sale price¥39,800
Synthetic Moissanite 8.931ct loose stone
Sale price¥45,800
Synthetic Moissanite 4.924ct loose stone
Sale price¥29,800
![Lab-Grown Diamond (Synthetic Diamond) [HPHT Method] Single Loose Stone (2.0mm, 2.2mm, 2.4mm, 2.6mm) [Multiple Purchase Discounts Available]](http://store.karatz.jp/cdn/shop/products/collage_6be597c0-338c-4671-838a-8b1e66598b68.jpg?v=1681976274&width=4000)
![[On sale March 6th at 10 PM JST] Limited to 13 stones! A Synthetic Gacha featuring a D/IF/3EX lab-grown diamond, usually ¥39,800, and a Sakura Cut YAG, usually ¥59,800 (plus a synthetic alexandrite). Multiple purchase discounts available.](http://store.karatz.jp/cdn/shop/files/collage_1d8578b7-6435-49c8-9cad-2cfb27758857.png?v=1772516956&width=2215)
![[On Sale at 10 PM on March 7th] Synthetic Alexandrite 4.3mm/0.430ct Loose Stone](http://store.karatz.jp/cdn/shop/files/collage_36a26dac-4236-491c-b16c-549e3b56c2e0.png?v=1772852146&width=2250)
![[On sale March 22nd, 10 PM JST] Synthetic Blue Sapphire 1.551ct Loose Stone (Synthetic Sapphire)](http://store.karatz.jp/cdn/shop/files/P2261069_20243114-d992-49aa-ad03-d063c7d4d949.jpg?v=1774005928&width=2945)
![[On Sale March 23rd at 10 PM] Lab-Grown Blue Sapphire 2.012 ct Loose Stone (Synthetic Sapphire)](http://store.karatz.jp/cdn/shop/files/P2261035_08597fca-5d96-422f-9dc0-77879c58435c.jpg?v=1774006756&width=2581)
![[On Sale at 10 PM on 2/22] Synthetic Blue Sapphire 0.886ct Loose Stone (Synthetic Sapphire)](http://store.karatz.jp/cdn/shop/files/P2198601_50390c89-e2d8-45e0-8425-1f7cc2d5cad1.jpg?v=1771723576&width=2719)
![[On sale 3/1 at 10pm] Synthetic Alexandrite 0.338ct Loose Stone](http://store.karatz.jp/cdn/shop/files/collage_cd9702c1-cd4b-4df5-919e-4d2662f0fea6.png?v=1772283805&width=2250)
[On sale 3/1 at 10pm] Synthetic Alexandrite 0.338ct Loose Stone
Sale price¥12,800
![[Sakura InCut] Synthetic Sapphire 2.610ct Loose Stone (Synthetic Pink Sapphire)](http://store.karatz.jp/cdn/shop/files/20260201_P2059052.jpg?v=1775550000&width=4000)
Synthetic moissanite (gray blue) 1.701ct loose
Sale price¥12,800
Synthetic Opal 0.856ct Loose (Synthetic Water Opal)
Sale price¥8,800
![[On Sale at 10 PM on January 3rd] 1.547ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)](http://store.karatz.jp/cdn/shop/files/PC240315_4091c662-36e7-4879-9811-fc79c07c9ceb.jpg?v=1767308181&width=2815)
![[1/2 22:00 Sale] Synthetic Sapphire 0.879ct Loose Stone (Synthetic Blue Sapphire)](http://store.karatz.jp/cdn/shop/files/PC240281_e4ec5167-ddbe-408f-a2f1-f113179145b5.jpg?v=1767276674&width=2534)
![[1/2 22:00 Sale] 2.077ct Synthetic Sapphire Loose Stone (Synthetic Blue Sapphire)](http://store.karatz.jp/cdn/shop/files/PC240267.jpg?v=1767276478&width=4000)
Synthetic Moissanite 0.632ct loose stone (tie cut)
Sale price¥3,980
Synthetic Moissanite 0.509ct loose stone (tie cut)
Sale price¥3,980
Synthetic moissanite 6mm/0.748ct loose (star cut)
Sale price¥19,800
Synthetic Alexandrite 5.7mm/0.827ct Loose Stone
Sale price¥19,800
Synthetic Moissanite 0.714ct loose stone
Sale price¥6,980
Synthetic Moissanite 0.358ct loose stone
Sale price¥3,980
Synthetic Moissanite 0.491ct loose stone
Sale price¥4,980
Synthetic moissanite 0.245ct loose (shield cut)
Sale price¥6,980
Synthetic moissanite 10.5mm/4.197ct loose (Portuguese cut)
Sale price¥29,800
Synthetic Moissanite 13mm/8.154ct Loose Stone
Sale price¥39,800
Synthetic Alexandrite 0.460ct loose stone
Sale price¥14,800
Synthetic Moissanite 13.5mm/8.950ct Loose
Sale price¥39,800
Synthetic Alexandrite 0.560ct loose stone
Sale price¥14,800
Synthetic Alexandrite 0.570ct loose stone
Sale price¥18,800
Synthetic Opal 2.026ct Loose
Sale price¥19,800
Synthetic Black Opal 5.013ct Loose
Sale price¥59,800
Synthetic black opal 2.996ct loose stone
Sale price¥29,800
Synthetic black opal 1.209ct loose stone
Sale price¥18,800
Synthetic Moissanite 1.186ct loose stone
Sale price¥12,800
Synthetic Moissanite 1.186ct loose stone
Sale price¥12,800
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.