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 "

Brazilian particolor Paraiba tourmaline 0.26ct loose GIA Sale price¥598,000

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

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

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

Pink tourmaline 0.482ct loose stone Sale price¥6,980

Pink tourmaline 1.404ct loose stone Sale price¥19,800

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 0.226ct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

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 0.065ctルース（CuO:2.0%、MnO:2.6%）

Brazilian Paraiba tourmaline 0.065ct loose (CuO:2.0%, MnO:2.6%) Sale price¥25,800

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

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

Mexican Fire Opal 1.30ct Loose Sale price¥6,980

Australian opal 14.837ct loose Sale price¥118,000

Bicolor tourmaline 3.080ct loose Sale price¥14,800

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

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

Fire opal 1.360ct loose Sale price¥25,800

[Cat cut] Blue green tourmaline 5.5mm loose Sale price¥12,800

Pink tourmaline 0.391ct loose Sale price¥5,980

Pink tourmaline 0.158ct loose Sale price¥8,800

【さくらインカット】トルマリン 9mm/5.590ctルース《コラボ》ワッペン付日独鑑

[Dandelion cut] Tourmaline 11mm/5.620ct loose "Collaboration" with emblem Japanese-German edition Sale price¥79,800

【NOBU氏】アマゾン産グリーンオパール《コラボ》6.8mmルース - カラッツSTORE

[Mr. NOBU] Green Opal from Amazon [Collaboration] 6.8mm loose Sale price¥9,800

[Cat cut] Amazon green opal 6.5mm/0.580ct loose Sale price¥9,800

Pink tourmaline 0.157ct loose Sale price¥6,980

【KEN氏】アフリカ産バイカラートルマリン 0.950ctルース（ファントムカット） - カラッツSTORE

African bicolor tourmaline 0.950ct loose stone (phantom cut) Sale price¥12,800

ブラジル産パライバトルマリン 0.230ctルース（CuO:0.8%、MnO:3.3%）

Paraiba tourmaline from Brazil 0.230ct loose (CuO:0.8%, MnO:3.3%) Sale price¥35,800

【KEN氏】メキシコ産ファイアオパール 1.580ctルース - カラッツSTORE

Mexican Fire Opal 1.580ct Loose Sale price¥35,800

ブラジル産パライバトルマリン 0.285ct原石（CuO:1.7%、MnO:2.7%）

Brazilian Paraiba tourmaline 0.285ct raw stone (CuO:1.7%, MnO:2.7%) Sale price¥19,800

【KEN氏】ファイアオパール2石ペア 4mm/0.336ctルース - カラッツSTORE

Fire Opal 2 Stone Pair 4mm/0.336ct Loose Sale price¥6,980

Pink opal 7.180ct loose Sale price¥8,800

Cantera opal 6.126ct loose Sale price¥8,800

Fire opal 2 stone set 1.440ct loose Sale price¥8,800

Brazilian Paraiba tourmaline in quartz 4.070ct loose Sale price¥19,800

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.

KARATZ・Five Commitments

So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.

KARATZの取り組みと社会貢献

業界発展のための後進育成や事業協力、宝石の国スリランカの子どもたちへの支援活動など、KARATZの取り組みについてご紹介いたします。

KARATZ Books

These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.

jeweler's tools

For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.