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 "
![[Koshu Precious Stone Kiriko] Rubellite 2.38ct loose with patch](http://store.karatz.jp/cdn/shop/products/PA220016_028e0968-b9aa-47fc-ba14-c2a3ff60b7fa.jpg?v=1634900258&width=4000)
![[Koshu Precious Stone Kiriko] Opal 2.080ct loose](http://store.karatz.jp/cdn/shop/products/PA220006_c9c0ccd0-3b08-4645-acc3-46d5e88d2eaf.jpg?v=1634900530&width=4000)
![[10/12 22:00 Sale] Brazilian Paraiba Tourmaline 0.052ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P9055383_be30d909-1a08-49d0-8629-c4795e44c535.jpg?v=1760060265&width=2997)
[10/12 22:00 Sale] Brazilian Paraiba Tourmaline 0.052ct Loose Stone
Sale price¥29,800
![[On Sale 10/11 at 10 PM] Brazilian Paraiba Tourmaline 0.170ct Loose Stone (CuO: 2.1%, MnO: 1.1%)](http://store.karatz.jp/cdn/shop/files/P9055559_913b3161-0377-4e63-a7b4-5b2f943979a1.jpg?v=1760050993&width=3296)
[10/12 22:00 Sale] Brazilian Rubellite 2.588ct Loose Stone
Sale price¥69,800
![[Available at 10 PM on 10/11] [Limited to 15 stones] Blue Stone Gacha (Top Color Benitoite 2.0mm, Paraiba Tourmaline in Quartz, Unheated Yogo Sapphire) [Multiple Purchase Discounts Available]](http://store.karatz.jp/cdn/shop/files/collage_990d7674-31c7-4cf4-99fb-32b47ab56a31.png?v=1759991382&width=2250)
![[On Sale 10/11 at 10 PM] [Limited to 18 stones] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) Loose Stone [Multiple Purchase Discounts Available]](http://store.karatz.jp/cdn/shop/files/P1010295_d8ab5f93-85a4-4f5a-ad44-3da845e08082.jpg?v=1759971801&width=4000)
![[10/11 22:00 Sale] Mexican Cantera Opal 14.690ct Loose](http://store.karatz.jp/cdn/shop/files/PA033654.jpg?v=1759638039&width=4000)
[10/11 22:00 Sale] Mexican Cantera Opal 14.690ct Loose
Sale price¥12,800
![[10/10 22:00 Sale] Brazilian Green Tourmaline 0.490ct Loose](http://store.karatz.jp/cdn/shop/files/PA033767_8fe0af6a-fc7f-40c7-b854-d3104963a93d.jpg?v=1759637339&width=2710)
Unheated Brazilian Color Change Paraiba Tourmaline 0.30ct Loose GIA
Sale price¥1,280,000
Brazilian Paraiba tourmaline 0.065ct loose (CuO:2.0%, MnO:2.6%)
Sale price¥22,800
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.