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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Limited to 15 stones: Blue Stone Gacha (Top-Color Benitoite 2.0mm, Paraiba Tourmaline in Quartz, Unheated Yogo Sapphire) (Multiple purchase discounts available)

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Blue Stone Gacha (normally 22,800 JPY for Brazilian Paraiba Tourmaline (CuO: 1.7%, MnO: 2.1%), Mozambique Paraiba Tourmaline, Zimbabwean Euclase, etc.)《Bulk Purchase Discount Available》

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Rare Stone Gacha 💎 Mozambique Paraiba Tourmaline, normally priced at ¥29,800, 1.8ct with a Shanshan appraisal certificate, Kornerupine, Epidote (Multiple purchase discount available)

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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!

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Limited to 10 stones Mexican Cantera Opal 1 loose stone (10 x 8 cm) Multiple purchase discounts available

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

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Baroque Opal 2 stones《Discount available for multiple purchases》

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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)

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

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Blue Stone Gacha💎 (Brazilian Paraiba Tourmaline, Mozambique Paraiba Tourmaline, German Auchenite, Benitoite) {Multiple Purchase Discounts Available}

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Limited Edition of 11 Rare Stones! 💎 Two 0.23ct Paraiba Tourmalines from Batalha, Brazil, a Pink Diamond, and a Benitoite Loose Stone. Discounts available for multiple purchases.

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Mini Kite Cut Loose Stone (Includes 2 Paraiba Tourmalines, Green Beryl, Ruby, Peridot, etc.) {Multiple Purchase Discounts Available}

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Limited to 15 stones, 1 loose Australian iron opal stone, multiple purchase discounts available

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Limited to 8 stones: Ethiopian black opal (heat-treated, identification instructions included, average 2ct, approx. 11x8mm) 1 loose stone (multiple purchase discounts available)

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[Limited to 6 stones] [Mr. Sanjay] Mexican opal or Sri Lankan spinel 1 loose stone (with defects) [Multiple purchase discount available]

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Panda Cut Gacha💎 Brazilian Paraiba Tourmaline (0.226ct/CuO: 0.7%, MnO: 2.5%) - 1 Stone, 5 Panda Cut Stones (Multiple Purchase Discounts Available)

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Limited to 9 stones: Carving Gacha (Opal, Tourmaline, Tsavorite Garnet) 1 loose stone (Multiple purchase discounts available)

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[Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]

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Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available

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

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《Limited to 9 Stones》Blue Gem Gacha💎Paraiba Tourmaline (CuO:2.2%.MnO:3.5%)・Hauyne・Benitoite・Apatite《Multiple Purchase Discount Available》

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Limited to 4 stones: Carving Gacha (pink tourmaline, average 3.4 carats) 1 loose stone (multiple purchase discounts available)

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Limited to 9 stones [Mr. Sanjay] Oil in quartz, spinel, yellow opal 1 loose stone (damaged) [Multiple purchase discount available]

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《Limited to 7 stones》1 stone tourmaline in quartz from Sri Lanka loose (8-9mm, octagonal cut)《Multiple purchase discount available》

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[On sale May 5th at 10 PM JST] Brazilian Indicolite Tourmaline 0.105ct Loose Stone with Appraisal Report

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Brazilian Paraiba Tourmaline (cabochon cut, approximately 2.2mm) 1 loose stone (multiple purchase discounts available)

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Brazilian Paraiba Tourmaline (cabochon cut, approximately 2.2mm) 1 loose stone (multiple purchase discounts available)

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Limited to 12 stones! Gemstone Gacha including Brazilian Paraiba Tourmaline rough stone 💎 1 rough stone (Multiple purchase discounts available)

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Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available

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Paraiba tourmaline from Brazil 4.1mm/0.240ct loose

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Australian boulder opal 52.582ct loose

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【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

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【宝石商の道具】加熱処理のエチオピア産オパール 1石（ブラックオパールとの見分けシート付） - カラッツSTORE

1 heat-treated Ethiopian opal (includes a sheet to distinguish it from black opal)

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Pink tourmaline 0.795ct loose

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【Sale starts 5/26 at 10 PM JST】[Colorful] Pt900 Paraiba Tourmaline from Brazil 0.11ct / Diamond 0.58ct Ring (CuO: 2.4%, MnO: 0.9%)

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【Sales start 10 PM, May 17th】《Limited 12 Gems》Win a Shimizu Kiseki Sakura In-cut Diamond! 💎 Tourmaline Gacha (plus a bonus Sanje Tourmaline)《Multiple Purchase Discount Available》

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Brazilian Paraiba Tourmaline 0.177ct loose stone (CuO: 2.1%, MnO: 1.3%)

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Paraiba tourmaline from Mozambique 1.581ct loose stone (CuO: 0.5%, MnO: 1.0%)

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Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)

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Brazilian bicolor tourmaline 7.445ct loose stone

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Mexican Cantera Opal 8.097ct Loose

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[On sale May 6, 10 PM JST] Mexican Cantera Opal Loose Stone, 2.096 ct

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[Published 12562689] Mexican Water Opal 1.018ct Loose Stone

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Brazilian Bicolor Tourmaline 4.554ct Loose Stone with Certification

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[Dandelion Cut] Brazilian Tourmaline 11mm/5.620ct Loose Stone with Certification by Shimizu Kisetsu [Limited to 1 Piece] ¥59,800 Item No. 12562697

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[On sale May 3rd, 10 PM JST] Peruvian Bi-Color Blue Opal 4.067ct Loose Stone

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Peruvian Bicolor Blue Opal 3.757ct Loose Stone

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Peruvian Bi-Color Blue Opal 2.707ct Loose Stone

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.