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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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カンテラオパール 5.204ctルース

Mexican Cantera Opal 5.204ct Loose Sale price¥12,800
ブラジル産グリーントルマリン 12.252ctルース

Brazilian Green Tourmaline 12.252ct Loose Stone Sale price¥398,000
ブラジル産パライバトルマリン 0.233ctルース（CuO:1.6％.MnO:2.4％）

Brazilian Paraiba Tourmaline 0.233ct loose stone (CuO: 1.6%. MnO: 2.4%) Sale price¥358,000
【KEN氏】ブラジル産グリーントルマリン 5.2mm/0.584ctルース（セミオーダーメイドセット）

[Staff Selection] [Mr. KEN] Brazilian Green Tourmaline 5.2mm/0.584ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800
Mozambique colorless tourmaline (acroite) 3.542ct loose stone

Mozambique colorless tourmaline (acroite) 3.542ct loose stone Sale price¥69,800
メキシコ産エッグインオパール 1.243ctルース

Mexican egg-in-opal 1.243ct loose stone Sale price¥14,800
メキシコ産エッグインオパール 0.627ctルース

Mexican egg-in-opal 0.627ct loose stone Sale price¥8,800
エチオピア産オパール 0.466ctルース

Ethiopian Opal 0.466ct Loose (Heart Shape, Faceted Cut) Sale price¥3,980
エチオピア産オパール 0.294ctルース

Ethiopian Opal 0.294ct Loose (Heart Shape, Faceted Cut) Sale price¥6,980
バイカラートルマリン 0.675ctルース

Bicolor tourmaline 0.675ct loose Sale price¥6,980
グリーントルマリン 0.991ctルース

Green Tourmaline 6mm/0.991ct Loose Sale price¥15,800
ピンクトルマリン 0.990ctルース

Pink tourmaline 6mm/0.990ct loose stone Sale price¥12,800
【サンジェ氏】メキシコ産ウォーターオパール 3.161ctルース（コントラルスオパール）

Mexican Water Opal 3.161ct Loose Stone (Contraluz Opal) Sale price¥69,800
ミントカラートルマリン 0.115ctルース

Mint color tourmaline 0.115ct loose Sale price¥5,980
ピンクトルマリン 1.690ctルース

Pink tourmaline 1.690ct loose Sale price¥39,800
【カメリアカット】オパール 5.283ctルース

[Camellia cut] Opal 14mm/5.283ct loose with patch Sale price¥98,000
【12530283掲載】カンテラオパール 17.221ctルース

Cantera opal 17.221ct loose Sale price¥25,800
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 Brazilian Paraiba Tourmaline (Batalha Mine) Gacha 💎 Usually ¥45,800 With sorting, includes unheated. 《Multiple purchase discount available》

Brazilian Paraiba Tourmaline (Batalha Mine) Gacha 💎 Usually ¥45,800 With sorting, includes unheated. 《Multiple purchase discount available》

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 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 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 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 12: Brazilian Indigolite Tourmaline Loose Stone (4x3mm, Oval Cut) - Multiple Purchase Discounts Available

Limited Edition of 12: Brazilian Indigolite Tourmaline Loose Stone (4x3mm, Oval Cut) - Multiple Purchase Discounts Available
Sold out 《Limited to 12 Stones》Rare Stone Gacha 💎 Cinnabar from China, Paraiba Tourmaline from Mozambique, Grandidierite, etc.《Multiple Purchase Discount Available》

《Limited to 12 Stones》Rare Stone Gacha 💎 Cinnabar from China, Paraiba Tourmaline from Mozambique, Grandidierite, etc.《Multiple Purchase Discount Available》
Sold out [On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available]

[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [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 【9/22 22時販売】《限定10石》通常59,800円のパーティーカラードパライバトルマリン（CuO:1.4%、MnO:2.8%））や通常29800円のバイカラーサファイア含むバイカラーガチャ（ミントガーネット1石付き）《複数購入割引有》

【9/22 22時販売】《限定10石》通常59,800円のパーティーカラードパライバトルマリン（CuO:1.4%、MnO:2.8%））や通常29800円のバイカラーサファイア含むバイカラーガチャ（ミントガーネット1石付き）《複数購入割引有》
Sold out 《Limited to 10 stones》Paraiba Gacha: Win a Brazilian Paraiba Tourmaline (CuO: 1.4%, MnO: 2.7%), usually priced at 39,800 yen 《Multi-purchase discounts available》

《Limited to 10 stones》Paraiba Gacha: Win a Brazilian Paraiba Tourmaline (CuO: 1.4%, MnO: 2.7%), usually priced at 39,800 yen 《Multi-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 《Limited to 9 Stones》Opal Gacha including Black Opal (plus one bonus Fire Opal) 《Bulk Purchase Discount Available》

《Limited to 9 Stones》Opal Gacha including Black Opal (plus one bonus Fire Opal) 《Bulk Purchase Discount Available》
Sold out 《Limited to 10 Stones》Rough Gemstone Gacha featuring Paraiba Tourmaline (CuO: 1.7%+), Benitoite and more (includes 1 free Oregon Sunstone) 《Multiple Purchase Discount Available》

《Limited to 10 Stones》Rough Gemstone Gacha featuring Paraiba Tourmaline (CuO: 1.7%+), Benitoite and more (includes 1 free Oregon Sunstone) 《Multiple Purchase Discount Available》
Sold out Limited 10 Gemstones: Cat Cut Gacha 💎 Tourmaline, Opal, Chalcedony, etc. (Comes with a bonus mini cat cut) (Multiple purchase discount available)

Limited 10 Gemstones: Cat Cut Gacha 💎 Tourmaline, Opal, Chalcedony, etc. (Comes with a bonus mini cat cut) (Multiple purchase discount 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]
Sold out Limited to 15 stones: Blue Stone Gacha (Top-Color Benitoite 2.0mm, Paraiba Tourmaline in Quartz, Unheated Yogo Sapphire) (Multiple purchase discounts available)

Limited to 15 stones: Blue Stone Gacha (Top-Color Benitoite 2.0mm, Paraiba Tourmaline in Quartz, Unheated Yogo Sapphire) (Multiple purchase discounts available)
Sold out Rare Stone Gacha 💎 Mozambique Paraiba Tourmaline, normally priced at ¥29,800, 1.8ct with a Shanshan appraisal certificate, Kornerupine, Epidote (Multiple purchase discount available)

Rare Stone Gacha 💎 Mozambique Paraiba Tourmaline, normally priced at ¥29,800, 1.8ct with a Shanshan appraisal certificate, Kornerupine, Epidote (Multiple purchase discount available)
Sold out Limited Edition of 10 Blue Gemstones! 💎 0.142ct Brazilian Paraiba Tourmaline, Euclase from Zimbabwe, 1.17ct Cobalt Spinel (Certificate of Authenticity: Color Shift), Benitoite, and More! Discounts Available for Multiple Purchases!

Limited Edition of 10 Blue Gemstones! 💎 0.142ct Brazilian Paraiba Tourmaline, Euclase from Zimbabwe, 1.17ct Cobalt Spinel (Certificate of Authenticity: Color Shift), Benitoite, and More! Discounts Available for Multiple Purchases!
Sold out Limited to 10 stones Mexican Cantera Opal 1 loose stone (10 x 8 cm) Multiple purchase discounts available

Limited to 10 stones Mexican Cantera Opal 1 loose stone (10 x 8 cm) Multiple purchase discounts available
Sold out Limited to 9 stones: 1 loose Mexican opal stone (multiple purchase discounts available)

Limited to 9 stones: 1 loose Mexican opal stone (multiple purchase discounts available)

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 《Limited to 10 Stones》Win a Koshu cut "Checker x Comet" Mexican fire opal, normally priced at 79,800 yen! 💎Fire Opal Gacha (Plus, get one extra "Contraluz" stone!) 《Bulk purchase discount available》

《Limited to 10 Stones》Win a Koshu cut "Checker x Comet" Mexican fire opal, normally priced at 79,800 yen! 💎Fire Opal Gacha (Plus, get one extra "Contraluz" stone!) 《Bulk purchase discount available》
Sold out Limited to 13 stones! Bicolor Gacha 💎 Bicolor Sphene, usually priced at ¥79,800, Party-color Paraiba Tourmaline, usually priced at ¥39,800, and more. (Multiple Purchase Discount Available)

Limited to 13 stones! Bicolor Gacha 💎 Bicolor Sphene, usually priced at ¥79,800, Party-color Paraiba Tourmaline, usually priced at ¥39,800, and more. (Multiple Purchase Discount Available)
Sold out Brazilian Paraiba Tourmaline (CuO: 2.3% and CuO: 1.4%) & Kornerupine Rough Gacha 《Multiple Purchase Discount Available》

Brazilian Paraiba Tourmaline (CuO: 2.3% and CuO: 1.4%) & Kornerupine Rough Gacha 《Multiple Purchase Discount 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.