![[Sale: Friday, December 19th, 10 PM] "Bungo and Alchemist" x KARATZ Collaboration Jewelry "Part 3" Bungo Ring [Edogawa Ranpo Model Ring]](http://store.karatz.jp/cdn/shop/files/02_db3f7ed0-177f-418b-b788-6f945e929acf.jpg?v=1764724403&width=1080)
![[Sale: Friday, December 19th, 10 PM] "Bungo and Alchemist" x KARATZ Collaboration Jewelry "Part 3" Bungo Ring [Kikuchi Kan Model Ring]](http://store.karatz.jp/cdn/shop/files/03_d1fff56d-18a4-444f-bd64-dfa11a0b9a45.jpg?v=1764724993&width=1080)
![[Sale: Friday, December 19th, 10 PM] "Bungo and Alchemist" x KARATZ Collaboration Jewelry "Part 3" Bungo Ring [Oda Sakunosuke Model]](http://store.karatz.jp/cdn/shop/files/01.jpg?v=1764723334&width=1080)
![[Listed at Shinjuku Marui Annex 202511] [Available at 10:00 PM on December 5th] YAG (Yttrium Aluminum Garnet) 6.5mm/1.548ct Loose Stone](http://store.karatz.jp/cdn/shop/files/yag-65mm1548ct-257679.jpg?v=1764892582&width=1200)
Chrysoberyl cat's eye 0.904ct loose
Sale price¥12,800
Strontium titanate 5mm/0.688ct loose stone
Sale price¥12,800
[Shinjuku Marui Annex 202511] [12/6 22:00] Mozambique Ruby 0.176ct Loose
Sale price¥18,800
[12/6 22:00] Brazilian Blue Topaz Cat's Eye 3.538ct Loose Stone
Sale price¥12,800
Sphene from Madagascar 1.853ct loose
Sale price¥24,800
Sphene from Madagascar 1.476ct loose
Sale price¥18,800
Bicolor sapphire from Madagascar 0.265ct loose
Sale price¥16,800
American benitoite 0.098ct loose
Sale price¥25,800
【12/30 22時販売】ブラジル産パイライトインクォーツ 9.477ctルース
Sale price¥22,800
【12/30 22時販売】ブラジル産パイライトインクォーツ 4.153ctルース
Sale price¥11,000
【12/30 22時販売】ブラジル産パライバトルマリン 0.128ctルース（CuO:1.7%,MnO:3.4%）
Sale price¥29,800
Sri Lankan star sapphire 2.094ct loose
Sale price¥12,800
Australian boulder opal 3.695ct loose
Sale price¥14,800
American red beryl 2.9mm/0.094ct loose
Sale price¥29,800
Bicolor Andesine 6mm/0.756ct loose
Sale price¥12,800
Oregon Sunstone 0.976ct loose
Sale price¥18,800
![[Available at 10 PM on December 20th] Mali Garnet (Grossular/Andradite Garnet) 0.872ct Loose Stone from the Republic of Mali with Certificate of Authenticity](http://store.karatz.jp/cdn/shop/files/PC031911.jpg?v=1766184428&width=4000)
![[12/20 22:00 Sale] Colombian Emerald Rough Stone 13.577ct](http://store.karatz.jp/cdn/shop/files/PC031743.jpg?v=1766184426&width=4000)
[12/20 22:00 Sale] Colombian Emerald Rough Stone 13.577ct
Sale price¥18,800
![[12/16 22:00] Brazilian Rose Quartz 4.019ct Loose Stone](http://store.karatz.jp/cdn/shop/files/PC053205_f1aaf7a0-87fb-4e1d-a7d0-a6b211d1cdaf.jpg?v=1765501592&width=4000)
[12/16 22:00] Brazilian Rose Quartz 4.019ct Loose Stone
Sale price¥11,000
Chrysoberyl cat's eye 2.283ct loose
Sale price¥12,800
Purple spinel 0.995ct loose stone
Sale price¥15,800
![[12/12-12/25 Shinjuku Marui Annex] Mark Pendant](http://store.karatz.jp/cdn/shop/files/bluelock_bnrB_02_1080x1080_a501ffc5-9563-4890-be6e-917d27e99a3a.jpg?v=1763022005&width=1080)
[12/12-12/25 Shinjuku Marui Annex] Mark Pendant
Sale price¥16,500
![[12/12-12/25 Shinjuku Marui Annex] Layered Ring](http://store.karatz.jp/cdn/shop/files/bluelock_bnrB_01_1080x1080_1.jpg?v=1763018217&width=1080)
[12/12-12/25 Shinjuku Marui Annex] Layered Ring
Sale price¥16,500
Bicolor grossular garnet 0.782ct loose
Sale price¥12,800
White topaz 16.06ct loose
Sale price¥25,800
Australian boulder opal 4.470ct loose
Sale price¥25,800
Yellow opal 17.283ct loose
Sale price¥29,800
![[12/17 22:00] Brazilian Dumortierite in Quartz 2.012ct Loose Stone](http://store.karatz.jp/cdn/shop/files/PC093183.jpg?v=1765758494&width=4000)
[12/17 22:00] Brazilian Dumortierite in Quartz 2.012ct Loose Stone
Sale price¥14,800
![[On Sale at 10 PM on December 21st] Madagascar Bicolor Sapphire 5.8mm/1.006ct Loose](http://store.karatz.jp/cdn/shop/files/PC093540.jpg?v=1766222404&width=4000)
![[12/21 22:00] Rainbow Garnet (Andradite Garnet) 7.0mm/2.135ct Loose Stone from Tenkawa Village, Nara Prefecture](http://store.karatz.jp/cdn/shop/files/PC093949.jpg?v=1766222522&width=4000)
[12/23 22:00] Mexican Fire Opal 1.283ct Loose
Sale price¥29,800
![[12/22 22:00] Sri Lankan Blue Sapphire 0.645ct Loose](http://store.karatz.jp/cdn/shop/files/PC094150_085972b7-dff6-42bb-8830-f50e160129b5.jpg?v=1766288263&width=3010)
[12/22 22:00] Sri Lankan Blue Sapphire 0.645ct Loose
Sale price¥25,800
![[12/22 22:00] Red Coral (Coral) 1.467ct Loose Stone](http://store.karatz.jp/cdn/shop/files/PC105283_62c2de18-0ec8-4ca9-bc5d-1b9ab5b3245a.jpg?v=1766287830&width=3153)
[12/22 22:00] Red Coral (Coral) 1.467ct Loose Stone
Sale price¥15,800
![[12/22 22:00] Red Coral (Coral) 1.406ct Loose Stone](http://store.karatz.jp/cdn/shop/files/PC105323_672699ff-9f8c-401b-83de-fb68168bb9d2.jpg?v=1766287829&width=2966)
[12/22 22:00] Red Coral (Coral) 1.406ct Loose Stone
Sale price¥12,800
![[12/22 22:00] Mozambique Ruby 0.537ct Loose](http://store.karatz.jp/cdn/shop/files/S__226091018_b83ec1cc-8623-4ea3-a264-a44125729b7e.jpg?v=1766288263&width=1143)
[12/22 22:00] Mozambique Ruby 0.537ct Loose
Sale price¥15,800
Brazilian Euclase 1.240ct loose
Sale price¥19,800
Mexican cantera opal 7.563ct loose
Sale price¥15,800
Mexican cantera opal 9.422ct loose
Sale price¥25,800
Mexican cantera opal 15.542ct loose
Sale price¥15,800
Yellow diamond rough stone (makeable) 0.247ct rough stone
Sale price¥22,800
Bicolor Zoisite 0.581ct loose
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.