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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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ブラジル産バイカラートルマリン 1.148ctルース

Brazilian bicolor tourmaline 1.148ct loose Sale price¥18,800
ブラジル産バイカラートルマリン 1.056ctルース

Brazilian bicolor tourmaline 1.056ct loose Sale price¥15,800
ブラジル産バイカラートルマリン 0.877ctルース

Brazilian bicolor tourmaline 0.877ct loose Sale price¥15,800
バイカラートルマリン 5.825ctルース

Bicolor tourmaline 5.825ct loose Sale price¥128,000
バイカラートルマリン 1.140ctルース

Bicolor tourmaline 1.140ct loose Sale price¥25,800
バイカラートルマリン 0.707ctルース

Bicolor tourmaline 0.707ct loose Sale price¥14,800
バイカラートルマリン 4.118ctルース

Bicolor tourmaline 4.118ct loose Sale price¥69,800
ブラジル産パライバトルマリン 0.129ctルース（ CuO:0.8%,MnO:0.1%）

Paraiba tourmaline from Brazil 0.129ct loose (CuO:0.8%,MnO:0.1%) Sale price¥48,800
ブラジル産パライバトルマリン 0.101ctルース（CuO:0.9%,MnO:0.1%）

Paraiba tourmaline from Brazil 0.101ct loose (CuO:0.9%,MnO:0.1%) Sale price¥39,800
ブラジル産パライバトルマリン 0.211ctルース（CuO:0.6%,MnO:3.1%）

Paraiba tourmaline from Brazil 0.211ct loose (CuO:0.6%,MnO:3.1%) Sale price¥49,800
アフガニスタン産ブルートルマリン 0.213ctルース

Blue tourmaline from Afghanistan 0.213ct loose Sale price¥5,980
アフガニスタン産ブルートルマリン 0.209ctルース

Blue tourmaline from Afghanistan 0.209ct loose Sale price¥6,980
アフガニスタン産ブルートルマリン 3.5mm/0.178ctルース

Blue tourmaline from Afghanistan 3.5mm/0.178ct loose Sale price¥6,980
【サンジェ氏】イエロートルマリン 0.431ctルース

Yellow tourmaline 0.431ct loose stone Sale price¥5,980
バイカラートルマリン 3.291ctルース

Brazilian bicolor tourmaline 3.291ct loose Sale price¥39,800
バイカラートルマリン 3.569ctルース

Brazilian bicolor tourmaline 3.569ct loose Sale price¥49,800
バイカラートルマリン 0.505ctルース（ローズカット）

Bicolor tourmaline 0.505ct loose (rose cut) Sale price¥8,800
バイカラートルマリン 0.669ctルース（ローズカット）

Bicolor tourmaline 0.669ct loose (rose cut) Sale price¥9,800
バイカラートルマリン 0.549ctルース（ローズカット）

Bicolor tourmaline 0.549ct loose (rose cut) Sale price¥9,800
ブラジル産ブルートルマリン 0.376ctルース

Brazilian blue tourmaline 0.376ct loose Sale price¥8,800
ブラジル産パライバトルマリン 0.144ctルース

Paraiba tourmaline from Brazil 0.144ct loose (CuO:0.9%,MnO:2.8%) Sale price¥55,800
【サンジェ氏】ピンクトルマリン 1.404ctルース

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
【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
ピンクオパール 7.180ctルース

Pink opal 7.180ct loose Sale price¥8,800
【カラフリ】Pt900ボルダーオパール15.82ct ペンダントトップ（ネックレストップ） - カラッツSTORE

[Colorful] Pt900 Boulder Opal 15.82ct Pendant Top (Necklace Top) Sale price¥69,800
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 [Jeweler's Tools] {3 sets remaining} 3-piece set: Jewelry loupe (14x magnification), blue diamond, and pink tourmaline or sapphire

[Jeweler's Tools] {3 sets remaining} 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 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 1 Brazilian Paraiba tourmaline stone (cabochon cut, average 0.25 ct)

1 Brazilian Paraiba tourmaline stone (cabochon cut, average 0.25 ct)

Sold out Gem Gacha💎1 Paraiba Tourmaline from Brazil (Batalha Mine)

Gem Gacha💎1 Paraiba Tourmaline from Brazil (Batalha Mine)

Sold out [Available at 10 PM on September 7th] Limited Quantity Gem Gacha 💎 Win 1 or 2 gems, including pink diamonds and 46ct cantera opals. Discounts available for multiple purchases.

[Available at 10 PM on September 7th] Limited Quantity Gem Gacha 💎 Win 1 or 2 gems, including pink diamonds and 46ct cantera 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 Brazilian Paraiba tourmaline (Batalha) 1 stone 1.3-1.4mm

Brazilian Paraiba tourmaline (Batalha) 1 stone 1.3-1.4mm

Sold out バロックオパール 2石 - KARATZ STORE｜カラッツSTORE

Baroque Opal 2 stones《Discount available for multiple purchases》

Sold out [Available at 10 PM on September 6th] Limited to 10 Blue Stones Gacha (Paraiba Tourmaline, Cobalt Garnite, Indigo Tourmaline with Certificate of Authenticity, Zimbabwean Euclase with Certificate of Authenticity) [Multiple Purchase Discounts Available]

[Available at 10 PM on September 6th] Limited to 10 Blue Stones Gacha (Paraiba Tourmaline, Cobalt Garnite, Indigo Tourmaline with Certificate of Authenticity, Zimbabwean Euclase with Certificate of Authenticity) [Multiple Purchase Discounts Available]
Sold out Gem Gacha💎 1 Paraiba Tourmaline from Brazil (Batalha mine, 2.5-3.0mm, includes blue)

Gem Gacha💎 1 Paraiba Tourmaline from Brazil (Batalha mine, 2.5-3.0mm, includes blue)
Sold out 《Only a few left》 Brazilian Paraiba Tourmaline (Batalia) Gacha💎1.2mm 1 out of 10 stones contains Cu&Mn (CuO:2.1%, MnO:0.9%/CuO:1.6%, MnO:1.5%) 《Multiple purchase discounts available》

《Only a few left》 Brazilian Paraiba Tourmaline (Batalia) Gacha💎1.2mm 1 out of 10 stones contains Cu&Mn (CuO:2.1%, MnO:0.9%/CuO:1.6%, MnO:1.5%) 《Multiple purchase discounts available》
Sold out [Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]

[Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]
Sold out Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available

Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available
Sold out Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》

Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》

Sold out Limited quantity: Brazilian Paraiba tourmaline, 1 stone loose (Batalha mine, oval cut) Multiple purchase discounts available

Limited quantity: Brazilian Paraiba tourmaline, 1 stone loose (Batalha mine, oval cut) Multiple purchase discounts available
Sold out Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available

Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available
Sold out ブラジル産パライバトルマリン 0.240ctルース

Paraiba tourmaline from Brazil 4.1mm/0.240ct loose

Sold out オーストラリア産ボルダーオパール 52.582ctルース

Australian boulder opal 52.582ct loose

Sold out 【ダンデライオンカット】メキシコ産ファイアオパール 7mm《コラボ》ルース ワッペン付

[Dandelion cut] Fire opal 7mm loose

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.