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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Bicolor tourmaline 3.641ct rough stone from Afghanistan

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ブラジル産パライバトルマリン 0.447ctルース（CuO:1.0%、MnO:3.6%）

Brazilian Paraiba tourmaline 0.447ct loose (CuO:1.0%, MnO:3.6%)

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1 Yellow Opal (October birthstone, faceted cut) {Multiple purchase discount}

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Mexican Hyalite Opal 2.822ct Loose (Faceted Cut)

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Black opal 1.005ct loose

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【KEN氏】ファイアオパール2石ペア 4.8mm/0.570ctルース - カラッツSTORE

[KEN] Fire opal 2 stone pair 4.8mm/0.570ct loose

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Bicolor tourmaline 3.570ct loose

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Boulder opal 14.950ct loose

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Bicolor tourmaline 0.80ct loose

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【ダンデライオンカット】グリーントルマリン 7.7mm/1.520ctルース《コラボ》ワッペン付

[Dandelion cut] Green tourmaline 7.7mm/1.520ct loose "Collaboration" with patch

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ブラジル産パライバトルマリン 0.069ctルース（CuO:1.6%、MnO:3.1%）

Paraiba tourmaline from Brazil 0.069ct loose (CuO:1.6%, MnO:3.1%)

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ブラジル産パライバトルマリン 0.071ctルース（ CuO:2.1%、MnO:0.7%）

Paraiba tourmaline from Brazil 0.071ct loose (CuO:2.1%, MnO:0.7%)

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ブラジル産パライバトルマリン 0.114ctルース（CuO:1.8%、MnO:2.4%）

Paraiba tourmaline from Brazil 0.114ct loose (CuO:1.8%, MnO:2.4%)

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ブラジル産パライバトルマリン 0.057ctルース（CuO:1.3%、MnO:3.3%）

Brazilian Paraiba tourmaline 0.057ct loose (CuO:1.3%, MnO:3.3%)

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Fire opal 0.830ct loose

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Boulder opal 2.680ct loose

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Unheated Brazilian Paraiba tourmaline 0.040ct loose AIGS

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ブラジル産パライバトルマリン 0.244ctルース（ CuO:1.2%、Mn:1.8%、バフトップ）

Paraiba tourmaline from Brazil 0.244ct loose (CuO:1.2%, Mn:1.8%, buff top)

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ブラジル産パライバトルマリン 0.079ctルース（CuO:1.6%、MnO:2.3%）

Paraiba tourmaline from Brazil 0.079ct loose (CuO:1.6%, MnO:2.3%)

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Fire opal 0.610ct loose

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Fire opal 0.490ct loose

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Mexican fire opal 0.230ct loose

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Water opal 0.700ct loose

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Cantera Opal 5.109ct loose

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Cantera Opal 3.731ct loose

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Cantera Opal 3.450ct loose

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Black opal 0.370ct loose

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Paraiba tourmaline from Brazil 1.204ct loose

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Boulder opal 10.310ct loose

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Paraiba tourmaline from Brazil 0.052ct loose (CuO:0.9%, MnO:0.4%)

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Brazilian Paraiba tourmaline in quartz 0.930ct loose

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Brazilian Paraiba tourmaline in quartz 0.60ct loose

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ブラジル産パライバトルマリン 0.053ctルース（CuO:0.8%、MnO:0.3%）

Brazilian Paraiba tourmaline 0.053ct loose (CuO:0.8%, MnO:0.3%)

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Brazilian Paraiba tourmaline 2 stone set 0.070ct loose

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Opal 3.650ct loose

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Tourmaline cat's eye 7.450ct loose

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Pink tourmaline 6.40ct loose

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Pink tourmaline 1.08ct loose

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Unheated Brazilian Paraiba tourmaline 0.170ct loose AIGS

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Cantera opal 143.246ct loose

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Blue tourmaline 0.730ct loose (green blue)

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Paraiba tourmaline from Brazil 0.054ct loose (CuO:1.6%, MnO:0.1%)

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ブラジル産パライバトルマリン 0.108ctルース（CuO:0.6%、MnO:0.3%）

Paraiba tourmaline from Brazil 0.108ct loose (CuO:0.6%, MnO:0.3%)

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ブラジル産パライバトルマリン 0.118ctルース（CuO:1.0%、MnO:0.6%）

Paraiba tourmaline from Brazil 0.118ct loose (CuO:1.0%, MnO:0.6%)

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ブラジル産パライバトルマリン 0.067ctルース（ CuO:2.4%、MnO:1.5%）

Paraiba tourmaline from Brazil 0.067ct loose (CuO:2.4%, MnO:1.5%)

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Brazilian Paraiba tourmaline 0.127ct loose (CuO:1.4%, MnO:1.7%)

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Paraiba tourmaline from Brazil 1.091ct loose

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K18 pink tourmaline earrings

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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