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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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[On sale from 10pm on November 2nd] {Limited to 10 stones} Gem gacha💎 Mexican cantera opal gacha 1 loose stone (October birthstone opal) {Multiple purchase discounts available}

[On sale from 10pm on November 2nd] {Limited to 10 stones} Gem gacha💎 Mexican cantera opal gacha 1 loose stone (October birthstone opal) {Multiple purchase discounts available} Sale price¥5,980
ブラジル産パライバトルマリン 0.240ctルース（CuO:1.5%、MnO:1.8%）

[On sale from 10/20 at 10pm] Brazilian Paraiba Tourmaline 0.240ct loose stone (CuO: 1.5%, MnO: 1.8%) Sale price¥45,800
【猫カット】ピンクトルマリン（バイカラー） 5mm/0.459ctルース

[On sale from 10/20 at 10pm] [Cat cut] Pink tourmaline (bicolor) 5mm/0.459ct loose stone Sale price¥7,980
ブラジル産バイカラートルマリン 16.088ctルース（トリカラー） 日独鑑

[On sale at 10pm on 10/21] Brazilian bicolor tourmaline 16.088ct loose stone (tricolor) Nikkei Sale price¥298,000
ブラジル産パライバトルマリン 0.167ctルース（CuO:1.1%、MnO:3.6%）

[On sale from 10/22 at 10pm] Brazilian Paraiba Tourmaline 0.167ct loose stone (CuO: 1.1%, MnO: 3.6%) Sale price¥69,800
ブラジル産バイカラートルマリン 0.820ctルース

[On sale at 10pm on 10/22] Brazilian bicolor tourmaline 0.820ct loose stone Sale price¥25,800
イエローオパール 0.428ctルース

[On sale at 10pm on 10/26] Mexican Yellow Opal 0.428ct Loose Sale price¥8,800
イエローオパール 0.673ctルース

[On sale at 10pm on 10/26] Mexican yellow opal 0.673ct loose Sale price¥8,800
ピンクトルマリン 0.448ctルース

[On sale at 10pm on 10/26] Brazilian pink tourmaline 0.448ct loose stone Sale price¥8,800
バイカラートルマリン 0.675ctルース

[On sale at 10pm on 10/26] Brazilian bicolor tourmaline 0.675ct loose stone Sale price¥9,800
ピンクトルマリン 0.323ctルース

[On sale at 10pm on 10/26] Brazilian pink tourmaline 0.323ct loose stone Sale price¥8,800
グリーントルマリン 0.764ctルース

[On sale at 10pm on 10/31] Brazilian green tourmaline 0.764ct loose stone Sale price¥9,800
グリーントルマリン 0.703ctルース

[On sale from 10/31 at 10pm] Brazilian green tourmaline 0.703ct loose stone Sale price¥15,800
ブラジル産ルベライト 1.525ctルース

[On sale 11/2 at 10pm] Brazilian Rubellite (Red Tourmaline) 1.525ct Loose Sale price¥39,800
ブラジル産ルベライト 2.022ctルース

[On sale at 10pm on 10/26] Brazilian Rubellite 2.022ct loose stone Sale price¥55,800
ブラジル産ルベライト 3.844ctルース

[On sale 11/2 at 10pm] Brazilian Rubellite (Red Tourmaline) 3.844ct Loose Stone Sale price¥128,000
ブラジル産パライバトルマリン 3.3mm/0.123ctルース《エイトリータ》（CuO:2.0%、MnO:0.8%）

[On sale from 11/1 at 22:00] Brazilian Paraiba Tourmaline 3.3mm/0.123ct loose stone "Eitreta" (CuO: 2.0%, MnO: 0.8%) Sale price¥128,000
バイカラートルマリン 1.540ctルース

[On sale at 10pm on 10/28] Brazilian bicolor tourmaline 1.540ct loose stone Sale price¥25,800
バイカラートルマリン 1.910ctルース

[On sale at 10pm on 10/28] Brazilian bicolor tourmaline 1.910ct loose stone Sale price¥25,800
バイカラートルマリン 1.209ctルース

[On sale at 10pm on 10/29] Brazilian bicolor tourmaline 1.209ct loose stone Sale price¥9,800
バイカラートルマリン 1.242ctルース

[On sale at 10pm on 10/29] Brazilian bicolor tourmaline 1.242ct loose stone Sale price¥15,800
オーストラリア産ブラックオパール 0.386ルース

[On sale at 10pm on November 9th] Australian black opal 0.386ct loose Sale price¥39,800
バイカラートルマリン 0.582ctルース

[On sale at 10pm on November 8th] Brazilian bicolor tourmaline 0.582ct loose stone Sale price¥6,980
オーストラリア産グリーンオパール 4.990ctルース

[On sale 11/8 at 22:00] Australian green opal 4.990ct loose Sale price¥9,800
ピンクトルマリン 0.543ルース

[On sale 11/3 at 22:00] Madagascar pink tourmaline 0.543ct loose stone Sale price¥14,800
インディゴライトトルマリン 0.626ルース

[11/2 22:00 Sale] Brazilian Indigolite Tourmaline 0.626ct Loose Stone JTL Grade Sale price¥18,800
オーストラリア産オパール 6.799ctルース

[11/2 22:00 Sale] Australian Opal 6.799ct Loose Stone, Japan-Germany Exchange Sale price¥59,800
Pt900/Pt850 ブラックオパール 0.37ct リング

[On sale 11/4 at 22:00] Pt900/Pt850 Australian black opal 0.37ct, diamond 0.73ct necklace Sale price¥198,000
バイカラートルマリン 0.914ルース

[On sale 11/3 at 22:00] Brazilian bicolor tourmaline 0.914ct loose stone Sale price¥12,800
【さくらシェイプ】メキシコ産オパール 6.7mm/0.792ctルース（コントラルス）

[On sale from 10pm on 11/4] [Sakura Shape] Mexican Opal 6.7mm/0.792ct [Collaboration] Loose (Contralus) Patch Sale price¥59,800
【12537576掲載】メキシコ産カンテラオパール 22.250ctルース

[On sale 11/4 at 22:00] Mexican Cantera Opal 22.250ct Loose Sale price¥59,800
バイカラートルマリン 0.548ctルース

[On sale 11/4 at 22:00] Brazilian bicolor tourmaline 0.548ct loose stone Sale price¥9,800
ブラジル産パライバトルマリン 0.181ctルース

[On sale 11/4 at 22:00] Brazilian Paraiba Tourmaline 0.181ct loose stone (CuO: 0.7%, MnO: 0.2%) Sale price¥59,800
ブラジル産パライバトルマリン 0.138ctルース

[On sale 11/4 at 22:00] Brazilian Paraiba Tourmaline 0.138ct loose stone Sale price¥39,800
ブラジル産パライバトルマリン 0.112ctルース

[On sale 11/4 at 22:00] Brazilian Paraiba Tourmaline 0.112ct loose stone Sale price¥29,800
バイカラートルマリン 1.177ctルース

[On sale at 10pm on 11/5] Brazilian bicolor tourmaline 1.177ct loose stone Sale price¥12,800
バイカラートルマリン 0.763ctルース

[On sale at 10pm on 11/5] Brazilian bicolor tourmaline 0.763ct loose stone Sale price¥7,980
メキシコ産ハイアライトオパール 0.170ctルース（ 太陽光でも蛍光）

[On sale 11/7 at 10pm] Mexican Hyalite Opal 0.170ct loose stone (fluoresces even in sunlight) Sale price¥18,800
ハイアライトオパール 0.170ctルース（太陽光でも蛍光）

[On sale 11/7 at 10pm] Mexican Hyalite Opal 0.171ct loose stone (fluoresces even in sunlight) Sale price¥17,800
メキシコ産ファイアオパール 1.341ctルース

[11/10 22:00 Sale] Mexican Fire Opal 1.341ct Loose Sale price¥39,800
ファイアオパール 1.755ctルース

[On sale 11/14 at 22:00] Mexican fire opal 1.755ct loose stone Sale price¥29,800
カンテラオパール 15.482ctルース

[On sale 11/10 at 22:00] Mexican Cantera Opal 15.482ct loose stone Sale price¥12,800
カンテラオパール 3.604ctルース

[On sale 11/10 at 22:00] Mexican Cantera Opal 3.604ct loose stone Sale price¥7,980
カンテラオパール 3.984ctルース

[On sale 11/10 at 22:00] Mexican Cantera Opal 3.984ct loose stone Sale price¥29,800
[On sale at 10pm on November 9th] {Limited to 2 stones} 1 loose green tourmaline from Brazil {Multiple purchase discounts available}

[On sale at 10pm on November 9th] {Limited to 2 stones} 1 loose green tourmaline from Brazil {Multiple purchase discounts available} Sale price¥3,980
【12541485掲載】スリランカ産トルマリン 3.496ctルース

[On sale 11/11 at 22:00] Sri Lankan brown tourmaline 3.496ct loose stone Sale price¥18,800
【さくらシェイプ】メキシコ産オパール 2.551ctルース ワッペン

[11/12 22:00 Sale] [Sakura Shape] Mexican Opal 2.551ct Loose Patch Sale price¥59,800
【KEN氏】ファイアオパール 1.270ctルース - カラッツSTORE

[On sale at 10pm on 11/15] Mexican Fire Opal 8.0mm/1.270ct Loose Sale price¥29,800

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.

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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