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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Australian black opal 0.277ct loose stone

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Australian black opal 0.838ct loose stone

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Brazilian Paraiba Tourmaline 3.1mm/0.144ct loose stone (CuO:1.4%, MnO:0.2%)

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Australian Opal 0.455ct Loose

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Mexican Fire Opal 0.453ct Loose

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Australian Opal 0.246ct Loose

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Australian black opal 1.853ct loose stone

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Australian black opal 0.787ct loose stone

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Australian black opal 0.123ct loose stone

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Australian black opal 0.389ct loose stone

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Australian black opal 0.967ct loose stone

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Ethiopian Opal (Heated) 2.222ct Loose

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K18 Brazilian Paraiba Tourmaline 0.588ct, Blue Diamond, Paraiba Tourmaline Pendant (Necklace)

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Kenyan illusion chrome tourmaline 3.258ct loose stone

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Kenyan Illusion Chrome Tourmaline 0.835ct Loose Stone

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Mexican Cantera Opal 3.159ct Loose

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Mexican Cantera Opal 1.710ct Loose

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Australian black opal 1.173ct loose stone (play of color on both sides)

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Australian black opal 0.466ct loose stone

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Australian black opal 0.383ct loose stone (play of color on both sides)

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Australian black opal 0.189ct loose stone

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Bicolor tourmaline 0.610ct loose

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Mozambique Rubellite 0.229ct Loose Stone

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Ethiopian Opal 0.394ct Loose (Heart Shape)

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Pt950 tanzanite 0.984ct, Akoya pearl, Brazilian Paraiba tourmaline, Benitoite ring

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K18 Brazilian Paraiba Tourmaline 0.20ct Blue Diamond Ring

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Iron Opal 13.230ct Loose Stone, Japan-Germany Exchange

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Brazilian Paraiba tourmaline in quartz 0.706ct loose

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Ethiopian Black Opal (Heated) 2.929ct Loose

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Ethiopian Black Opal (Heated) 1.738ct Loose

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Ethiopian black opal (heated) 1.850ct loose

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Ethiopian black opal (heated) 1.743ct loose

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Watermelon tourmaline 2.633ct loose

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Watermelon tourmaline 3.659ct loose

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Paraiba tourmaline from Brazil 0.012ct loose

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Colorless tourmaline (acroite) 6.400ct loose

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Mexican water opal 0.309ct loose

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Mexican fire opal 0.244ct loose

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[Mr. Sanjay] Green tourmaline 3.223ct loose

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Paraiba tourmaline from Brazil 0.023ct loose

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Mexican water opal 5.823ct loose DGL version

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[Mr. Sanjay] Rubellite 0.562ct loose

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Unheated Brazilian Paraiba Tourmaline 0.040ct Loose Stone AIGS

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Hyalite opal from Mexico 1.871ct loose

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Ethiopian opal 6.840ct rough stone

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Ethiopian opal 5.572ct rough stone

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Paraiba tourmaline from Brazil 0.266ct loose (CuO:1.3%,MnO:1.4%)

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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