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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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Sold out Paraiba tourmaline from Brazil 0.075ct loose

Paraiba tourmaline from Brazil 0.075ct loose
Sold out ブラジル産パライバトルマリン 0.025ctルース

Paraiba tourmaline from Brazil 0.025ct loose
Sold out [Mr. Sanjay] Bicolor tourmaline 0.678ct loose

[Mr. Sanjay] Bicolor tourmaline 0.678ct loose
Sold out 《Limited to 9 stones》 1 stone water opal from Mexico 《Discount available for multiple purchases》 (all stones with identification certificate)

《Limited to 9 stones》 1 stone water opal from Mexico 《Discount available for multiple purchases》 (all stones with identification certificate)
Sold out Paraiba tourmaline from Mozambique 0.230ct loose

Paraiba tourmaline from Mozambique 0.230ct loose
Sold out Paraiba tourmaline from Mozambique 0.074ct loose

Paraiba tourmaline from Mozambique 0.074ct loose
Sold out ルベライト 0.474ctルース

[Mr. Sanjay] Rubellite 0.474ct loose
Sold out ブラジル産パライバトルマリン 0.344ctルース

Paraiba tourmaline from Brazil 4.1mm/0.344ct loose
Sold out Paraiba tourmaline from Brazil 0.034ct loose

Paraiba tourmaline from Brazil 0.034ct loose

Sold out モザンビーク産ピンクトルマリン 1.111ctルース

[KEN] Pink tourmaline from Mozambique 1.111ct loose

Sold out ブラジル産パライバトルマリン 0.384ctルース

Paraiba tourmaline from Brazil 0.384ct loose
Sold out ブラジル産パライバトルマリン 0.154ctルース

Paraiba tourmaline from Brazil 0.154ct loose
Sold out グリーントルマリン 0.573ctルース

[Mr. Sanjay] Green tourmaline 0.573ct loose
Sold out ピンクトルマリン 0.362ctルース

[Mr. Sanjay] Pink tourmaline 0.362ct loose
Sold out ブラジル産パライバトルマリン 0.188ctルース

Paraiba tourmaline from Brazil 3.6mm/0.188ct loose
Sold out ブラジル産パライバトルマリン 0.181ctルース

Paraiba tourmaline from Brazil 3.4mm/0.181ct loose

Sold out ブラジル産パライバトルマリン 0.371ctルース

Paraiba tourmaline from Brazil 0.371ct loose

Sold out ブラジル産パライバトルマリン 0.169ctルース

Paraiba tourmaline from Brazil 2.5mm/0.169ct loose
Sold out モザンビーク産パライバトルマリン 0.314ctルース

《Yurakucho Marui 2024112 takeout》Mozambique Paraiba Tourmaline 0.314ct loose stone

Sold out モザンビーク産パライバトルマリン 0.182ctルース

Paraiba tourmaline from Mozambique 0.182ct loose

Sold out メキシコ産ウォーターオパール 1.388ctルース

[Mr. Sanjay] Mexican water opal 1.388ct loose (Contrallus opal)
Sold out ブラジル産パライバトルマリン 0.039ctルース

Paraiba tourmaline from Brazil 0.039ct loose

Sold out ブラジル産パライバトルマリン 0.063ctルース

Paraiba tourmaline from Brazil 0.063ct loose

Sold out Paraiba tourmaline from Brazil 0.075ct loose

Paraiba tourmaline from Brazil 0.075ct loose
Sold out ブラジル産パライバトルマリン 0.090ctルース

Paraiba tourmaline from Brazil 0.090ct loose
Sold out ブラジル産パライバトルマリン 0.151ctルース

Paraiba tourmaline from Brazil 0.151ct loose
Sold out 【12547167掲載】ブラジル産パライバトルマリン 0.050ctルース

Paraiba tourmaline from Brazil 0.050ct loose
Sold out 【12547166掲載】ブラジル産パライバトルマリン 0.122ctルース

Paraiba tourmaline from Brazil 0.122ct loose
Sold out 【12547164掲載】ブラジル産パライバトルマリン 0.155ctルース

Paraiba tourmaline from Brazil 0.155ct loose
Sold out Paraiba tourmaline from Brazil 0.048ct loose

Paraiba tourmaline from Brazil 0.048ct loose

Sold out Paraiba tourmaline from Brazil 0.043ct loose

Paraiba tourmaline from Brazil 0.043ct loose

Sold out Paraiba tourmaline from Brazil 0.083ct loose

Paraiba tourmaline from Brazil 0.083ct loose

Sold out ブラジル産パライバトルマリン 0.032ctルース

Paraiba tourmaline from Brazil 0.032ct loose

Sold out Indigolite tourmaline 0.508ct loose Japanese-German edition

Indigolite tourmaline 0.508ct loose Japanese-German edition

Sold out メキシコ産ウォーターオパール 0.456ctルース

[Draft due to discoloration] [Mr. Sanje] Mexican water opal 0.456ct loose (contrarus opal)

Sold out Paraiba tourmaline from Brazil 0.226ct loose (CuO:1.8%.MnO:2.5%)

Paraiba tourmaline from Brazil 0.226ct loose (CuO:1.8%.MnO:2.5%)

Sold out オパール 0.617ctルース

Opal 6mm/0.617ct loose (rose cut)

Sold out オパール 0.578ctルース

Opal 6mm/0.578ct loose (rose cut)
Sold out メキシコ産カンテラオパール 11.121ctルース

Mexican cantera opal 11.121ct loose
Sold out メキシコ産カンテラオパール 12.290ctルース

Mexican cantera opal 12.290ct loose
Sold out ブルートルマリン 0.204ctルース

"Yurakucho Marui 2024112" Blue tourmaline 3.5mm/0.204ct loose stone
Sold out ピンクトルマリン1石ルース（ラウンドカット,3mm）《複数購入割引有》

1 stone loose pink tourmaline (round cut, 3mm)《Discount available for multiple purchases》

Sold out ピンクトルマリン 2.955ctルース

Pink tourmaline 2.955ct loose

Sold out 【KEN氏】メキシコ産ファイアオパール 1.181ctルース

[Mr. KEN] Mexican fire opal 1.181ct loose

Sold out ブラジル産パライバトルマリン 0.069ctルース（CuO:1.7%,MnO:1.9%）

Paraiba tourmaline from Brazil 0.069ct loose (CuO:1.7%,MnO:1.9%)

Sold out 【5/21 22時販売】ブラジル産パライバトルマリンキャッツアイ 0.326ctルース（ CuO:0.3%,MnO:4.2%） - カラッツSTORE

Brazilian Paraiba tourmaline cat's eye 0.326ct loose (CuO:0.3%,MnO:4.2%)

Sold out ブラジル産パライバトルマリン 0.064ctルース（CuO:1.6%,MnO:0.9%）

Paraiba tourmaline from Brazil 0.064ct loose (CuO:1.6%,MnO:0.9%)

Sold out ブラジル産パライバトルマリン 0.083ctルース（ CuO:1.5%,MnO:3.2%）

Paraiba tourmaline from Brazil 0.083ct loose (CuO:1.5%,MnO:3.2%)

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