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10月誕生石

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 Brazilian watermelon Paraiba tourmaline 0.145ct loose

Brazilian watermelon Paraiba tourmaline 0.145ct loose

Sold out Green tourmaline 4.423ct loose Japanese-German book

Green tourmaline 4.423ct loose Japanese-German book

Sold out 【甲州貴石切子】メキシコ産ファイアオパール 1.318ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Kiriko] Fire Opal from Mexico 1.318ct《Collaboration》 Loose with emblem

Sold out バイカラートルマリン 2.245ctルース

Bicolor tourmaline 2.245ct loose

Sold out バイカラートルマリン 2.214ctルース

Bicolor tourmaline 2.214ct loose

Sold out Paraiba tourmaline from Brazil 0.99ct loose GIA

Paraiba tourmaline from Brazil 0.99ct loose GIA

Sold out ブラジル産パライバトルマリン 0.078ctルース（CuO:2.2%、MnO:2.5%）

Paraiba tourmaline from Brazil 0.078ct loose (CuO:2.2%, MnO:2.5%)

Sold out ブラジル産パライバトルマリン 0.063ctルース（CuO:3.1%、MnO:2.7%）

Paraiba tourmaline from Brazil 0.063ct loose (CuO:3.1%, MnO:2.7%)

Sold out ブラジル産バイカラーパライバトルマリン 0.068ctルース（CuO:1.4%、MnO:0.6%）

Brazilian bicolor Paraiba tourmaline 0.068ct loose (CuO:1.4%, MnO:0.6%)

Sold out ブラジル産パライバトルマリンキャッツアイ 0.720ctルース（CuO:2.2%,Mno:3.6%）

Brazilian Paraiba tourmaline cat's eye 0.720ct loose (CuO:2.2%, Mno:3.6%)

Sold out 【ダンデライオンカット】ファイアオパール7mmルース ワッペン付

[Dandelion cut] Fire opal 7mm loose with patch

Sold out 【ダンデライオンカット】ファイアオパール 7mm ルース ワッペン付

[Dandelion Cut] Fire Opal 7mm Loose with Patch

Sold out ブラジル産パライバトルマリン 0.125ctルース（CuO:2.5%、MnO:3.0%）

Paraiba tourmaline from Brazil 0.125ct loose (CuO:2.5%, MnO:3.0%)

Sold out Paraiba tourmaline from Brazil 0.048ct loose (CuO:1.7%, MnO:1.7%)

Paraiba tourmaline from Brazil 0.048ct loose (CuO:1.7%, MnO:1.7%)

Sold out 【12534202掲載】非加熱ブラジル産パライバトルマリン 0.110ctルース

Unheated Brazilian Paraiba tourmaline 0.110ct loose AIGS

Sold out 非加熱ブラジル産パライバトルマリン 0.170ctルース

Unheated Brazilian Paraiba tourmaline 0.170ct loose AIGS

Sold out 【12533128掲載】オパール 1.470ctルース

[Konpeito] Opal 1.470ct Loose

Sold out 非加熱バイカラーブラジル産パライバトルマリン 0.133ctルース GIA

Unheated bicolor Brazilian Paraiba tourmaline 0.133ct loose GIA

Sold out モザンビーク産パライバトルマリン 1.810ctルース AIGS

Paraiba tourmaline from Mozambique 1.810ct loose AIGS

Sold out 【さくらインカット】ピンクトルマリン 7mmルース ワッペン付 - カラッツSTORE

[Sakura in-cut] Pink tourmaline 7mm loose with patch

Sold out ブラジル産パライバトルマリン 0.144ctルース（CuO:2.5%、MnO:2.7%）

Paraiba tourmaline from Brazil 0.144ct loose (CuO:2.5%, MnO:2.7%)

Sold out バイカラートルマリン 3.570ctルース

Bicolor tourmaline 3.570ct loose

Sold out 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)

Sold out 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%)

Sold out ブラックオパール 0.370ctルース

Black opal 0.370ct loose

Sold out 非加熱ブラジル産パライバトルマリン 0.170ctルース AIGS

Unheated Brazilian Paraiba tourmaline 0.170ct loose AIGS

Sold out 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%)

Sold out 【12529215掲載】ブラジル産パライバトルマリン 0.127ctルース

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

Sold out ブラジル産パライバトルマリン 4.794ct原石

Paraiba tourmaline 4.794ct raw stone from Brazil

Sold out 【金平糖】オパール 3.910ctルース

[Konpeito] Opal 3.910ct loose

Sold out 【大人用】宝石磨きに挑戦してみよう「自分で出来る原石磨きセット」（初心者向け：バイカラーフローライト）・ボルダーオパール付※原石磨きコンテスト対象 ※

[For adults] Let's try gemstone polishing "Do-it-yourself rough stone polishing set" (for beginners: bicolor fluorite) with boulder opal *Subject to the rough stone polishing contest*

Sold out 1 green opal from Amazon《Discount available for multiple purchases》

1 green opal from Amazon《Discount available for multiple purchases》

Sold out [Jeweler's Tools] 3-piece set: Jewelry Loupe (14x magnification), Blue Diamond, and Pink Tourmaline or Sapphire

[Jeweler's Tools] 3-piece set: Jewelry Loupe (14x magnification), Blue Diamond, and Pink Tourmaline or Sapphire
Sold out Brazilian Paraiba Tourmaline (1.0mm, top quality)《Multiple purchase discount available》

Brazilian Paraiba Tourmaline (1.0mm, top quality)《Multiple purchase discount available》

Sold out 1 Ethiopian Opal (Baroque)《Discount available for multiple purchases》

1 Ethiopian Opal (Baroque)《Discount available for multiple purchases》

Sold out Limited to 13 stones! Tourmaline gacha featuring indigolite tourmaline worth ¥50,000 and rubellite worth ¥60,000. Plus, one canary yellow tourmaline. Discounts available for multiple purchases.

Limited to 13 stones! Tourmaline gacha featuring indigolite tourmaline worth ¥50,000 and rubellite worth ¥60,000. Plus, one canary yellow tourmaline. Discounts available for multiple purchases.

Sold out Limited to 20 stones! Includes 2 Koshu Kiriko fire opals and 1 loose fire opal. Discounts available for multiple purchases.

Limited to 20 stones! Includes 2 Koshu Kiriko fire opals and 1 loose fire opal. Discounts available for multiple purchases.
Sold out Limited to 15 sets: Two Nigerian tourmaline gemstones (October birthstone) Discounts available for multiple purchases

Limited to 15 sets: Two Nigerian tourmaline gemstones (October birthstone) Discounts available for multiple purchases
Sold out Limited to 25 stones: Brazilian Paraiba Tourmaline (including bicolor, Batalha) rough stones, average size 0.1ct. Discounts for multiple purchases available.

Limited to 25 stones: Brazilian Paraiba Tourmaline (including bicolor, Batalha) rough stones, average size 0.1ct. Discounts for multiple purchases available.
Sold out [Limited to 24 stones] Tourmaline Gacha💎Indigolite tourmaline, clover cut, and other single loose stones {Multiple purchase discounts available}

[Limited to 24 stones] Tourmaline Gacha💎Indigolite tourmaline, clover cut, and other single loose stones {Multiple purchase discounts available}
Sold out Limited Edition of 16 Blue Stones (Bicolor Benitoite, Brazilian Paraiba Tourmaline, Santa Maria Aquamarine, etc.)

Limited Edition of 16 Blue Stones (Bicolor Benitoite, Brazilian Paraiba Tourmaline, Santa Maria Aquamarine, etc.)
Sold out 《Limited to 15 Stones》Rare Stone Gacha 💎 Featuring non-oiled red beryl with GIA certificate for 98,000 yen, cinnabar, Mozambique Paraiba tourmaline, benitoite, and more. 《Multiple purchase discount available》

《Limited to 15 Stones》Rare Stone Gacha 💎 Featuring non-oiled red beryl with GIA certificate for 98,000 yen, cinnabar, Mozambique Paraiba tourmaline, benitoite, and more. 《Multiple purchase discount available》
Sold out Limited to 9 stones: Australian black opal (including semi-black opal) loose stone (includes a bonus white opal) (Multiple purchase discounts available)

Limited to 9 stones: Australian black opal (including semi-black opal) loose stone (includes a bonus white opal) (Multiple purchase discounts available)

Sold out Bicolor Gacha including Brazilian parti-colored Paraiba tourmaline (CuO: 1.7%, MnO: 2.9%), bicolor sapphire, bicolor tourmaline, and specially cut bicolor fluorite, normally 79,800 JPY (multiple purchase discount available)

Bicolor Gacha including Brazilian parti-colored Paraiba tourmaline (CuO: 1.7%, MnO: 2.9%), bicolor sapphire, bicolor tourmaline, and specially cut bicolor fluorite, normally 79,800 JPY (multiple purchase discount available)
Sold out Limited to 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases.

Limited to 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases.
Sold out Limited Quantity Gem Gacha! Win 1 or 2 gems, including pink diamonds and 46ct candela opals. Discounts available for multiple purchases.

Limited Quantity Gem Gacha! Win 1 or 2 gems, including pink diamonds and 46ct candela opals. Discounts available for multiple purchases.
Sold out 《9石限定》ジェムガチャ『春色カラー』💎バイカラートルマリン1石 - カラッツSTORE

Gem Gacha "Spring Colors" 💎 1 Bicolor Tourmaline (Multiple Purchase Discounts Available)

Sold out Limited to 10 stones: Paraiba Tourmaline Gacha 💎 Paraiba Tourmaline or Paraiba Tourmaline in Quartz (1 loose stone) [Multiple purchase discounts available]

Limited to 10 stones: Paraiba Tourmaline Gacha 💎 Paraiba Tourmaline or Paraiba Tourmaline in Quartz (1 loose stone) [Multiple purchase discounts available]

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's Initiatives and Social Contributions

We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.

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.