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 "

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Mexican cantera opal 3.788ct loose

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Mexican cantera opal 18.759ct loose

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Mexican cantera opal 2.564ct loose

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Mexican fire opal 1.970ct loose (mineral included)

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K18ベニトアイト0.11ct・アイスブルーダイヤモンド・パライバトルマリンリング - カラッツSTORE

K18 Benitoite 0.11ct/Ice Blue Diamond/Paraiba Tourmaline Ring

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Indigolite tourmaline 1.593ct loose

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[KEN] Opal 0.248ct loose

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ブラジル産パライバトルマリン 0.103ctルース（CuO:2.6%、MnO:3.0%）

Paraiba tourmaline from Brazil 0.103ct loose (CuO:2.6%, MnO:3.0%)

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Mexican cantera opal 10.560ct loose

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Mexican cantera opal 11.550ct loose

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[Cat cut] Bicolor tourmaline 5mm/0.502ct loose

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[Cat cut] Bicolor tourmaline 5mm/0.490ct《Collaboration》 Loose

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[Cat cut] Pink tourmaline 5mm/0.461ct《Collaboration》 Loose

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【カラフリ】Pt900ブラックオパール0.99ct・ダイヤモンドペンダントトップ（ネックレストップ） - カラッツSTORE

[Colorful] Pt900 black opal 0.99ct/diamond pendant top (necklace top)

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【カラフリ】Pt900/Pt850パライバトルマリン0.17ct ペンダント（ネックレス）（CuO:1.74%,Mno:3.72%）中宝鑑 - カラッツSTORE

[Colorful] Pt900/Pt850 Paraiba Tourmaline 0.17ct Pendant (Necklace) (CuO:1.74%, Mno:3.72%) Chuhokan

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[Koshu precious stone Kiriko plusthree] Particolor tourmaline 3.544ct loose

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ブラジル産パライバトルマリン 0.123ctルース（ CuO:1.4%、MnO:3.4%）

Paraiba tourmaline from Brazil 0.123ct loose (CuO:1.4%, MnO:3.4%)

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ブラジル産パライバトルマリン 0.092ctルース（CuO:1.6%、MnO:0.4%）

Paraiba tourmaline from Brazil 0.092ct loose (CuO:1.6%, MnO:0.4%)

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[KEN] Tourmaline 0.463ct loose

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[KEN] Tourmaline 0.240ct loose

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【さくらインカット】メキシコ産ウォーターオパール 7mm/0.784ctルースワッペン付 - カラッツSTORE

[Sakura Incut] Mexican water opal 7mm/0.784ct loose with patch

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Pt900/K18パライバトルマリン0.05ct リング（CuO:0.8%、MnO:0.4%） - カラッツSTORE

Pt900/K18 Paraiba tourmaline 0.05ct ring (CuO:0.8%, MnO:0.4%)

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Australian opal 0.414ct loose

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Australian opal 0.263ct loose

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Australian black opal 0.190ct loose

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Australian black opal 0.188ct loose

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Australian black opal 0.242ct loose

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Australian black opal 0.302ct loose

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【KEN氏】メキシコ産オパール 4.3mm/0.203ctルース - カラッツSTORE

[KEN] Opal from Mexico 4.3mm/0.203ct loose

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Rubellite 0.94ct loose

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[Koshu Precious Stone Kiriko] Rubellite 2.38ct loose with patch

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Hyalite opal from Mexico 4.621ct loose

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Bicolor tourmaline 1.980ct loose

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Color change tourmaline 0.328ct loose Japanese-German edition

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Mexican opal 1.091ct loose

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Opal 6.657ct loose

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Mexican fire opal 1.725ct loose

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Indigolite tourmaline 1.398ct loose Japanese-German edition

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【クローバーインカット】メキシコ産ウォーターオパール 6mm/0.466ctルースワッペン付 - カラッツSTORE

[Clover in cut] Mexican water opal 6mm/0.466ct loose with patch

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ブラジル産パライバトルマリン 0.162ctルース（CuO:2.5%、Mn:2.8%）

Paraiba tourmaline from Brazil 0.162ct loose (CuO:2.5%, Mn:2.8%)

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Paraiba tourmaline from Brazil 0.273ct loose (CuO:0.7%, MnO:4.1%)

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Indigolite tourmaline 1.103ct loose medium treasure

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Bicolor tourmaline 5.401ct loose

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Opal 6mm/0.526ct loose (rose cut)

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Opal 6mm/0.566ct loose (rose cut)

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Pink tourmaline 6mm/1.058ct loose

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Illusion chrome tourmaline from Kenya 1.094ct loose

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Illusion chrome tourmaline from Kenya 1.540ct loose

KARATZ Custom Made

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.

The fifth reprint has been decided and is now on sale at bookstores nationwide and online.

Written by KARATZ, book “Jewelry Illustrated Book”

The book provides explanations about over 300 types of gemstones, from new standard birthstones to rare stones that are hard to find, as well as a diary of our company representative, Mr. Koyama's, gemstone shopping experience in Thailand and Sri Lanka, and tips for photographing gemstones, allowing you to learn about the appeal of gemstones from various perspectives.

KARATZ・Five Commitments