Colombian cat's eye emerald 0.959ct loose stone
Sale price¥45,800
Colombian cat's eye emerald 1.121ct loose stone
Sale price¥49,800
Mint green sapphire 0.348ct loose
Sale price¥9,800
Bicolor sapphire from Madagascar 0.252ct loose
Sale price¥9,800
Bicolor sapphire from Madagascar 0.265ct loose
Sale price¥16,800
Bicolor sapphire from Madagascar 0.198ct loose
Sale price¥7,980
Bicolor sapphire from Madagascar 0.212ct loose
Sale price¥7,980
Mexican water opal 0.212ct loose (contrarus opal)
Sale price¥18,800
Unheated silky pink sapphire from Vietnam 0.247ct loose
Sale price¥8,800
[12/6 22:00] Mozambique Ruby 0.176ct Loose
Sale price¥18,800
Mexican Water Opal (Faceted) 0.402ct Loose (Contrarus Opal)
Sale price¥12,800
![[12/7 22:00 Sale] Mexican Egg-in Opal 0.381ct Loose](http://store.karatz.jp/cdn/shop/files/PC053061_853dfbb9-2bb5-4b4f-abbd-aef4b76d3dd5.jpg?v=1766553969&width=4000)
[12/7 22:00 Sale] Mexican Egg-in Opal 0.381ct Loose
Sale price¥18,800
Sri Lankan Yellow Sapphire 0.343ct Loose
Sale price¥12,800
Synthetic Opal 0.856ct Loose (Synthetic Water Opal)
Sale price¥8,800
Yellow diamond rough stone (makeable) 0.247ct rough stone
Sale price¥22,800
Mexican cantera opal 15.542ct loose
Sale price¥15,800
Mexican cantera opal 9.422ct loose
Sale price¥25,800
Mexican cantera opal 7.563ct loose
Sale price¥15,800
Australian boulder opal 6.980ct loose
Sale price¥6,980
![[On sale at 10pm on January 24th] 1.689ct loose teal blue sapphire](http://store.karatz.jp/cdn/shop/files/PC094302.jpg?v=1769086511&width=4000)
[On sale at 10pm on January 24th] 1.689ct loose teal blue sapphire
Sale price¥98,000
Mozambique ruby 0.537ct loose stone
Sale price¥15,800
Sri Lankan star sapphire 12.679ct loose
Sale price¥158,000
Sri Lankan star sapphire 5.066ct loose
Sale price¥69,800
Australian black opal 2.736ct loose
Sale price¥98,000
Sri Lankan star sapphire 3.821ct loose
Sale price¥79,800
Mexican fire opal 1.283ct loose stone
Sale price¥29,800
Mexican fire opal 1.413ct loose stone
Sale price¥39,800
![[1/3 22:00 Sale] Colombian Trapiche Emerald 2.318ct Loose](http://store.karatz.jp/cdn/shop/files/PC105337_e39d1703-b14f-4f9f-a6ca-66e084772758.jpg?v=1767139580&width=3038)
[1/3 22:00 Sale] Colombian Trapiche Emerald 2.318ct Loose
Sale price¥158,000
![[1/11 22:00 Sale] Sri Lankan Star Sapphire 3.317ct Loose](http://store.karatz.jp/cdn/shop/files/PC105054.jpg?v=1767910913&width=4000)
[1/11 22:00 Sale] Sri Lankan Star Sapphire 3.317ct Loose
Sale price¥59,800
![[1/3 22:00 Sale] Sri Lankan Star Sapphire 11.342ct Loose](http://store.karatz.jp/cdn/shop/files/PC104916.jpg?v=1767139824&width=4000)
[1/3 22:00 Sale] Sri Lankan Star Sapphire 11.342ct Loose
Sale price¥69,800
Sri Lankan blue sapphire 1.008ct loose stone
Sale price¥69,800
Australian boulder opal 2.326ct loose
Sale price¥69,800
![[On Sale at 10 PM on January 10th] Mexican Cantera Opal 8.432ct Loose](http://store.karatz.jp/cdn/shop/files/PC094449.jpg?v=1767824877&width=4000)
[On Sale at 10 PM on January 10th] Mexican Cantera Opal 8.432ct Loose
Sale price¥39,800
Mexican Cantera Opal 9.166ct Loose
Sale price¥69,800
Purple Diamond 0.070ct Loose (FANCY VIVID PINK PURPLE, I-1)
Sale price¥188,000
Australian boulder opal 4.470ct loose
Sale price¥25,800
Yellow opal 17.283ct loose
Sale price¥29,800
Diamond 0.052ct loose (trapeze cut, VS class equivalent)
Sale price¥6,980
![[Shinjuku Marui withdrawal on 2026/03/19] [Sales start 1/11 22:00] Australian Black Opal 2.275ct Loose (Double-sided)](http://store.karatz.jp/cdn/shop/files/P1088453.jpg?v=1767942327&width=4000)
![[1/2 22:00 Sale] Mexican Opal (Faceted) 0.261ct Loose (Contrarus Opal)](http://store.karatz.jp/cdn/shop/files/PC240121.jpg?v=1767275395&width=4000)
[1/2 22:00 Sale] Mexican Opal (Faceted) 0.261ct Loose (Contrarus Opal)
Sale price¥12,800
![[1/2 22:00 Sale] Mexican Fire Opal (Faceted) 0.401ct Loose (Contrarus Opal)](http://store.karatz.jp/cdn/shop/files/PC240043_ec518479-ffe7-45e0-b250-412a86f35bef.jpg?v=1767274443&width=4000)
Green sapphire 0.607ct loose stone
Sale price¥12,800
Sri Lankan Yellow Sapphire 0.170ct Loose
Sale price¥12,800
Sri Lankan Yellow Sapphire 0.182ct Loose
Sale price¥9,800
![[On Sale at 10 PM on January 10th] Sri Lankan Golden Sapphire 0.649ct Loose](http://store.karatz.jp/cdn/shop/files/PC052449_a4b861d7-9f5a-4c81-99af-2ee7df8e864c.jpg?v=1767825067&width=3343)
![[1/4 22:00 Sale] Sri Lankan Yellow Sapphire 0.297ct Loose](http://store.karatz.jp/cdn/shop/files/PC052373_25e69aae-a2b9-4d47-85eb-63421f78ebb1.jpg?v=1767484196&width=4000)
[1/4 22:00 Sale] Sri Lankan Yellow Sapphire 0.297ct Loose
Sale price¥12,800
![[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)
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.