![[On sale from 10/25 at 10 PM] Limited to 12 stones: Mexican Opal (Custom Faceted Cut) Loose Stone [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/collage_563486d0-bfec-49f4-9cb5-32fe12701045.png?v=1761350349&width=2250)
[12559449] Australian Boulder Opal 3.122ct Loose
Sale price¥29,800
[12559448] Mexican Opal 0.233ct Loose
Sale price¥12,800
【11/2 22時販売】メキシコ産ハイアライトオパール 1.420ctルース
Sale price¥18,800
[11/2 22:00] Mexican Hyalite Opal 0.743ct Loose
Sale price¥12,800
![[On sale from 10/25 at 10 PM] Limited to 11 stones: Sakura-shaped Contralus Opal and a specially cut Opal Gacha with one loose stone [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/2025-10-258.06.34.png?v=1761347238&width=1250)
[On Sale at 10 PM on October 29th] Mexican Fire Opal 5.8mm/0.345ct Loose
Sale price¥12,800
[On Sale at 10 PM on 10/28] Mexican Fire Opal 4.8mm/0.199ct Loose
Sale price¥8,800
![[10/12 22:00 Sale] Australian Crystal & White Opal 13-Stone Half Eternity Ring Set (2.0mm)](http://store.karatz.jp/cdn/shop/files/collage_21d6e8f2-2d1a-4738-919f-899174f1af56.png?v=1760146487&width=2250)
[10/18 22:00 Sale] Australian Boulder Opal 1.457ct Loose
Sale price¥9,800
1 green opal from Amazon《Discount available for multiple purchases》
Sale price¥2,980
![[Available at 10 PM on September 21st] Limited to 20 stones. Includes 2 Koshu Kiriko Fire Opals. 1 loose fire opal gacha. Discounts available for multiple purchases.](http://store.karatz.jp/cdn/shop/files/7_cf8144ee-7ac5-4965-b93c-f9f618bb4cbf.png?v=1758172271&width=1500)
![[Limited to 6 stones] [Mr. Sanjay] Mexican opal or Sri Lankan spinel 1 loose stone (with defects) [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/collage_555b8b37-ff10-4ed1-a662-dd56cbebe95a.jpg?v=1708594237&width=4000)
![[Available at 10 PM on August 11th] Limited to 9 stones: 1 loose Mexican opal stone [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/products/P1306513.jpg?v=1754827869&width=4000)
![[On sale from 10/5 at 10 PM] Limited to 9 stones: 1 loose Australian opal (faceted cut) [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/15_dc816088-689d-48f9-a277-773d85ed082c.png?v=1759454434&width=1500)
![Limited to 9 stones [Mr. Sanjay] Oil in quartz, spinel, yellow opal 1 loose stone (damaged) [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/P2220131_50010af8-99af-424d-9d1b-6ade6dc62a7a.jpg?v=1708595324&width=4000)
Australian white opal 2.092ct loose stone
Sale price¥9,800
Mexican Hyalite Opal 2.592ct loose
Sale price¥9,800
![[On Sale 10/10 at 10 PM] [Limited to 8 stones] Mexican Hyalite Opal Loose Stone (Large 4ct, Fluorescent in sunlight) [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/collage_02d2c005-b0b0-4bdb-b567-6788a4b464ec.png?v=1759967028&width=2250)
Australian boulder opal 0.874ct loose
Sale price¥3,980
Australian boulder opal 1.156ct loose
Sale price¥3,980
Australian boulder opal 1.173ct loose
Sale price¥5,980
Australian boulder opal 0.982ct loose
Sale price¥6,980
[10/11 22:00 Sale] Mexican Cantera Opal 14.690ct Loose
Sale price¥12,800
[10/10 22:00 Sale] Australian Opal 0.374ct Loose
Sale price¥6,980
[10/10 22:00 Sale] Mexican Cantera Opal 1.120ct Loose
Sale price¥8,800
Australian boulder opal 1.868ct loose
Sale price¥18,800
Australian boulder opal 1.675ct loose
Sale price¥14,800
Australian boulder opal 28.880ct loose
Sale price¥59,800
[Camellia cut] Mexican fire opal 1.270ct loose with patch
Sale price¥98,000
[On Sale at 10pm on October 1st] Australian Boulder Opal 9.120ct Loose
Sale price¥98,000
UV opal from Hokkaido 12.259ct loose with patch
Sale price¥6,980
Mexican Opal 8mm/1.430ct Loose
Sale price¥25,800
Australian opal 14.837ct loose
Sale price¥98,000
Mexican Fire Opal 1.580ct Loose
Sale price¥25,800
Cantera opal 17.284ct loose
Sale price¥29,800
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.