October birthstone
October's birthstone is opal tourmaline .
Opal is known for its play-of-color effect, which shows an aurora-like glow of seven colors on its surface, but some types do not show this play-of-color effect. Not only are there many types, but each one has a different play of color, so I think it's perfect for those who like unique gemstones.
Tourmaline is a gemstone with so many color variations that it is said that there is no other color. Some are called by different names depending on their color, such as Paraiba tourmaline and rubellite . Some stones have multiple colors in one stone, and others look like watermelons, so I think it's fun to collect a variety of stones and enjoy the different colors.
Karatz GemMagazine
" List of October birthstones and birthstones "
![[On sale May 16th at 10 PM JST] Limited to 10 stones! Cat Cut Gacha 💎 Tourmaline, Opal, Chalcedony, etc. (Includes a bonus mini-mini cat cut stone) (Multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/28_bc4803b4-5e4e-4a51-b5c9-60df2c8819e2.png?v=1778377827&width=1890)
![[5/ 10 PM Sale] Limited to 10 Stones: Koshu-Kiseki-Kiriko "Checker x Sui" Mexican Fire Opal Gacha 💎 (Bulk Purchase Discount Available)](http://store.karatz.jp/cdn/shop/files/27_82a970f3-f0af-4a8f-b088-2b2a73e4e17f.png?v=1778314244&width=1890)
【5/28 22時販売】ブラジル産パライバトルマリン 0.239ctルース（CuO:0.8%、MnO:3.7%）
Sale price¥45,800
【5/28 22時販売】ブラジル産パライバトルマリン 3.1mm/0.151ctルース（CuO:1.1%、MnO:3.8%）
Sale price¥29,800
【5/28 22時販売】ブラジル産パライバトルマリン 0.265ctルース（CuO:0.7%、MnO:3.0%）
Sale price¥29,800
【5/28 22時販売】ブラジル産パライバトルマリン 0.205ctルース（CuO:0.8%、MnO:3.1%）
Sale price¥39,800
【5/28 22時販売】ブラジル産パライバトルマリン 0.211ctルース（CuO:0.6%,MnO:3.1%）
Sale price¥39,800
Loose Paraiba Tourmaline from Brazil, 0.059ct (CuO: 1.4%, MnO: 2.7%)
Sale price¥45,800
Brazilian Paraiba Tourmaline 0.065ct Loose Stone (CuO: 2.0%, MnO: 2.4%)
Sale price¥49,800
Brazilian Paraiba Tourmaline 0.066ct loose stone (CuO:1.7%, MnO:2.4%)
Sale price¥49,800
0.062ct Loose Paraiba Tourmaline from Brazil (CuO: 1.7%, MnO: 2.5%)
Sale price¥47,800
Brazilian Paraiba Tourmaline 0.056ct Loose Stone (CuO:2.1%, MnO:2.2%)
Sale price¥39,800
Pink tourmaline 0.845ct loose stone
Sale price¥12,800
Yellow Opal 0.372ct Loose (Faceted Cut)
Sale price¥8,800
Mexican Hyalite Opal 1.215ct Loose (Faceted Cut)
Sale price¥8,800
Paraiba tourmaline from Brazil 0.061ct loose
Sale price¥25,800
Paraiba tourmaline from Brazil 0.049ct loose
Sale price¥19,800
Paraiba tourmaline from Brazil 0.018ct loose
Sale price¥12,800
Paraiba tourmaline from Brazil 0.023ct loose
Sale price¥19,800
【5/30 22時販売】ブラジル産シーフォームトルマリン 4.1mm/0.303ctルース
Sale price¥16,800
【5/30 22時販売】ブラジル産シーフォームトルマリン 4.2mm/0.319ctルース
Sale price¥17,800
【5/31 22時販売】ブラジル産シーフォームトルマリン 4.1mm/0.280ctルース
Sale price¥15,800
Ethiopian Opal 5.7mm/0.878ct Loose (Sphere)
Sale price¥6,980
Mozambique Elbaite Tourmaline 1.793ct Loose Stone
Sale price¥39,800
Paraiba tourmaline from Brazil 0.071ct loose
Sale price¥19,800
Tanzanian Chrome Tourmaline 0.760ct Loose Stone
Sale price¥5,980
Mexican Opal 9.6mm/1.803ct Loose (Contralus Opal)
Sale price¥49,800
Pink tourmaline 1.157ct loose stone
Sale price¥12,800
![[On sale May 17th at 10 PM] Brazilian Paraiba Tourmaline 0.038ct Loose Stone (CuO: 1.3%, MnO: 2.7%)](http://store.karatz.jp/cdn/shop/files/PC060276_1b9a5a08-e995-4c6b-8d72-51429efc4673.jpg?v=1702080791&width=3163)
![[Sale on 5/17 at 10 PM] Brazilian Paraiba Tourmaline 0.038ct Loose Stone (CuO: 1.6%, MnO: 2.8%)](http://store.karatz.jp/cdn/shop/files/PC060216_faed4771-d083-4ba2-874c-ff26a6b9446c.jpg?v=1702080534&width=3190)
![[On sale May 17th, 10 PM] Brazilian Paraiba Tourmaline 0.035ct Loose Stone (CuO: 2.4%, MnO: 2.5%)](http://store.karatz.jp/cdn/shop/files/PC060096_cbbead0f-f658-466d-bfe8-f353822160e0.jpg?v=1702421084&width=3613)
![[On sale May 17th, 10 PM JST] Brazilian Paraiba Tourmaline 0.050ct Loose Stone (CuO: 1.9%, MnO: 3.6%)](http://store.karatz.jp/cdn/shop/files/PC060064_986e097c-d9d4-4d12-bbe1-aab610692eee.jpg?v=1702421170&width=3252)
![[On sale May 16, 10 PM JST] Brazilian Paraiba Tourmaline 0.039ct Loose Stone (CuO:1.6%, MnO:2.9%)](http://store.karatz.jp/cdn/shop/files/PC060034_845cab0d-64a9-4b88-8e21-86048c1b4681.jpg?v=1702168763&width=3509)
![[For Sale 10:00 PM May 16th] Brazilian Paraiba Tourmaline 0.035ct Loose Stone (CuO: 1.6%, MnO: 3.3%)](http://store.karatz.jp/cdn/shop/files/PC060004_43d6b30d-df57-4983-b854-e2aa9731b664.jpg?v=1702168845&width=3394)
[Listing 12563050] Australian Boulder Opal 41.775ct Loose Stone
Sale price¥19,800
[12563049 listed] Australian Boulder Opal 12.216ct Loose Gemstone
Sale price¥15,800
Tanzanian Chrome Tourmaline 0.522ct Loose Stone
Sale price¥3,980
Pink tourmaline 6.1mm/1.031ct loose stone
Sale price¥12,800
Pink tourmaline 0.466ct loose
Sale price¥8,800
[Sale on May 24th at 10 PM JST] Australian Black Opal 0.216ct Loose
Sale price¥11,000
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.