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 "

《Yurakucho Marui 2024112 Takeout》Unheated Brazilian Color Change Paraiba Tourmaline 0.30ct Loose GIA Sale price¥1,280,000

Unheated Paraiba tourmaline from Brazil 0.050ct loose GIA (color change Paraiba tourmaline) Sale price¥148,000

ブラジル産パライバトルマリン 0.226ctルース（CuO:0.7%、MnO:2.5%）

Brazilian Paraiba tourmaline 0.226ct loose (CuO:0.7%, MnO:2.5%) Sale price¥45,800

Cantera Opal 2.661ct loose Sale price¥12,800

Bicolor tourmaline 0.591ct loose (rose cut) Sale price¥9,800

Bicolor tourmaline 0.435ct loose (rose cut) Sale price¥6,980

[Mr. Sanjay] Pink tourmaline 0.482ct loose Sale price¥6,980

[Mr. Sanjay] Pink tourmaline 1.404ct loose Sale price¥19,800

[Mr. Sanjay] Bicolor tourmaline 1.339ct loose Sale price¥19,800

【サンジェ氏】バイカラートルマリン 0.880ctルース - カラッツSTORE

[Mr. Sanjay] Bicolor tourmaline 0.880ct loose Sale price¥19,800

Bicolor tourmaline 0.763ct loose (rose cut) Sale price¥14,800

{Yurakucho Marui 2024112 takeout} Bicolor tourmaline 0.572ct loose stone (rose cut) Sale price¥14,800

Bicolor tourmaline 0.901ct loose (rose cut) Sale price¥15,800

Bicolor tourmaline 0.716ct loose (rose cut) Sale price¥9,800

Pt950オレゴンサンストーン1.24ct・インディゴトルマリン・ブルーダイヤリング - カラッツSTORE

Pt950 Oregon Sunstone 1.24ct Indigo Tourmaline Blue Diamond Ring Sale price¥98,000

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%）

Paraiba tourmaline from Brazil 0.205ct loose (CuO:0.8%, MnO:3.1%) Sale price¥45,800

ブラジル産パライバトルマリン 0.167ctルース（CuO:1.6%、MnO:3.0%）

Paraiba tourmaline from Brazil 0.167ct loose (CuO:1.6%, MnO:3.0%) Sale price¥35,800

ブラジル産パライバトルマリン 0.086ctルース（CuO:1.5%、MnO:2.3%）

Paraiba tourmaline from Brazil 0.086ct loose (CuO:1.5%, MnO:2.3%) Sale price¥19,800

ブラジル産パライバトルマリン 0.116ctルース（CuO:0.9%、MnO:2.4%）

Brazilian Paraiba tourmaline 0.116ct loose (CuO:0.9%, MnO:2.4%) Sale price¥26,800

ブラジル産パライバトルマリン 0.226ctルース（CuO:0.7%、MnO:3.6%）

Paraiba tourmaline from Brazil 0.226ct loose (CuO:0.7%, MnO:3.6%) Sale price¥49,800

ブラジル産パライバトルマリン 0.157ctルース（CuO:1.0%、MnO:3.7%）

Brazilian Paraiba tourmaline 0.157ct loose (CuO:1.0%, MnO:3.7%) Sale price¥32,800

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%）

Paraiba tourmaline from Brazil 3.1mm/0.151ct loose (CuO:1.1%, MnO:3.8%) Sale price¥29,800

Paraiba tourmaline from Brazil 0.204ct loose Sale price¥36,800

Paraiba tourmaline from Brazil 0.239ct loose Sale price¥59,800

Paraiba tourmaline from Brazil 0.232ct loose Sale price¥58,800

ブラジル産パライバトルマリン 0.240ctルース（CuO:0.7%、MnO:3.8%）

Paraiba tourmaline from Brazil 0.240ct loose (CuO:0.7%, MnO:3.8%) Sale price¥59,800

ブラジル産パライバトルマリン 0.166ctルース（CuO:0.7%、MnO:3.6%）

Paraiba tourmaline from Brazil 0.166ct loose (CuO:0.7%, MnO:3.6%) Sale price¥32,800

ブラジル産パライバトルマリン 0.065ctルース（CuO:2.0%、MnO:2.6%）

《Yurakucho Marui 2024112 takeout》Brazilian Paraiba tourmaline 0.065ct loose stone (CuO:2.0%, MnO:2.6%) Sale price¥25,800

【KEN氏】アフリカ産ピンクトルマリン 1.006ctルース（ファントムカット） - カラッツSTORE

[Mr. KEN] African pink tourmaline 1.006ct loose (phantom cut) Sale price¥12,800

【KEN氏】メキシコ産オパール 8mm/1.430ctルース - カラッツSTORE

[KEN] Opal from Mexico 8mm/1.430ct loose Sale price¥39,800

Bicolor tourmaline 1.248ct loose Sale price¥8,800

Bicolor tourmaline 1.097ct loose Sale price¥6,980

【KEN氏】トルマリンキャッツアイ 0.810ctルース - カラッツSTORE

[Mr. KEN] Tourmaline cat's eye 0.810ct loose Sale price¥4,980

【KEN氏】メキシコ産ファイアオパール 1.30ctルース - カラッツSTORE

[KEN] Mexican fire opal 1.30ct loose Sale price¥6,980

Australian opal 14.837ct loose Sale price¥118,000

【KEN氏】メキシコ産ファイアオパール 1.190ctルース - カラッツSTORE

[KEN] Fire opal from Mexico 1.190ct loose Sale price¥25,800

Bicolor tourmaline 3.080ct loose Sale price¥14,800

Cantera opal 12.211ct loose Sale price¥8,800

Cantera Opal 46.175ct loose Sale price¥19,800

ブラジル産パライバトルマリン 0.134ctルース（CuO:0.8%、MnO:2.3%）

Paraiba tourmaline from Brazil 0.134ct loose (CuO:0.8%, MnO:2.3%) Sale price¥29,800

Watermelon tourmaline 44.201ct Ruth Japanese-German book Sale price¥398,000

[KEN] Fire opal 0.448ct loose Sale price¥6,980

Green tourmaline 2.166ct loose (sugar loaf cut) Sale price¥8,800

Bicolor tourmaline 3.277ct loose Sale price¥9,800

Particolor tourmaline 32.207ct loose (tricolor tourmaline) Sale price¥398,000

Cantera opal 17.284ct loose Sale price¥39,800

Cantera Opal 8.678ct loose Sale price¥35,800

[Camellia cut] Opal 14mm loose with patch Sale price¥128,000

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.

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