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 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/P8200767.jpg?v=1787563557&width=4000)
![[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/P8200827.jpg?v=1787563629&width=4000)
【9/18 22時販売】【カラフリ】Pt900 トルマリンキャッツアイ 4.598ct ダイヤモンド0.20ctリング
Sale price¥98,000
【9/11 22時販売】メキシコ産ファイアオパール（ファセットカット） 1.255ctルース
Sale price¥49,800
【9/13 22時販売】オーストラリア産ホワイトオパール 0.584ctルース（ローズカット）
Sale price¥8,800
【9/7 22時販売】ブラジル産バイカラートルマリン 3.337ctルース
Sale price¥59,800
【9/5 22時販売】ブラジル産パライバトルマリン 4.022ctルース
Sale price¥45,800
【9/5 22時販売】ブラジル産パライバトルマリン 20.766ct原石
Sale price¥25,800
【9/5 22時販売】ブラジル産パライバトルマリン 20.758ct原石
Sale price¥29,800
【9/5 22時販売】ブラジル産パライバトルマリン 20.343ct原石
Sale price¥15,800
【9/5 22時販売】ブラジル産パライバトルマリン 8.246ct原石
Sale price¥25,800
Mozambique Pink Tourmaline 1.122ct Loose Stone (Contains CuO)
Sale price¥39,800
Brazilian Paraiba Tourmaline 0.037ct Loose (CuO:1.9%, MnO:2.3%)
Sale price¥29,800
Paraiba Tourmaline from Brazil 0.067 ct loose (CuO: 1.4%, MnO: 2.4%)
Sale price¥39,800
Brazilian Paraiba Tourmaline 0.821ct rough stone
Sale price¥39,800
Brazilian Alexandrite 0.239ct Loose Gemstone [Listed as 12564071]
Sale price¥45,800
【9/9 22時販売】【カラフリ】Pt900 オパール 1.10ct ダイヤモンド0.46ctリング
Sale price¥98,000
【9/7 22時販売】ブラジル産バイカラートルマリン 1.753ctルース
Sale price¥29,800
Brazilian pink tourmaline 1.458ct loose stone
Sale price¥39,800
Amazon Green Opal 0.814ct Loose (Faceted Cut)
Sale price¥7,980
Amazonian green opal 0.517ct loose stone (faceted cut)
Sale price¥7,980
Amazon Green Opal 0.285ct Loose (Faceted Cut)
Sale price¥6,980
Brazilian Tourmaline (untreated) 5.120ct loose stone
Sale price¥39,800
【8/30 22時販売】メキシコ産ファイアオパール 0.352ctルース
Sale price¥7,980
[Camellia cut] Mexican fire opal 1.270ct loose with patch
Sale price¥69,800
[Published on 12563859] Australian black opal, 1.184ct loose stone
Sale price¥45,800
[Listing 12563862] Australian Black Opal 1.392ct Loose
Sale price¥69,800
【9/1 22時販売】アフガニスタン産ミントカラートルマリン 0.290ctルース
Sale price¥14,800
【9/1 22時販売】ブラジル産パライバトルマリンインクォーツ 4.3mm/0.327ctルース
Sale price¥18,800
【9/1 22時販売】ブラジル産パライバトルマリンインクォーツ 2.737ctルース
Sale price¥45,800
![[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available]](http://store.karatz.jp/cdn/shop/files/P8190691.jpg?v=1787563399&width=4000)
![[Published on 22602652] [Colorful] K18 Synthetic Opal Pendant Top](http://store.karatz.jp/cdn/shop/files/collage_a6b9c743-f455-4833-96ce-6fd9b0d6dd4b.png?v=1787359048&width=2000)
[Published on 22602652] [Colorful] K18 Synthetic Opal Pendant Top
Sale price¥16,800
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.