Login
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 "

Sort by
[Available 9/20 at 10 PM] Limited to 7 pieces: Brazilian Batalha Paraiba Tourmaline & Elbaite rough stone gacha, featuring bicolor Paraiba (CuO: 2.7%, MnO: 2.0%) usually priced at 25,800 yen (multi-purchase discounts available).

[Available 9/20 at 10 PM] Limited to 7 pieces: Brazilian Batalha Paraiba Tourmaline & Elbaite rough stone gacha, featuring bicolor Paraiba (CuO: 2.7%, MnO: 2.0%) usually priced at 25,800 yen (multi-purchase discounts available). Sale price¥6,980
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》 Sale price¥19,800
【9/22 22時販売】《限定10石》通常59,800円の甲州貴石切子plusthree「昴」ファイアオパールや29,800円のKEN氏コントラルスオパールのメキシコ産オパールガチャ1石（北海道産ロードクロサイト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円の甲州貴石切子plusthree「昴」ファイアオパールや29,800円のKEN氏コントラルスオパールのメキシコ産オパールガチャ1石（北海道産ロードクロサイト1石付き）《複数購入割引有》 Sale price¥6,980
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》 Sale price¥18,800
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》 Sale price¥15,800
ブラジル産インディゴライトトルマリン 2.587ctルース

[Deadline 8/29 | Lottery Sale] Brazilian Indicolite Tourmaline 2.587ct Loose Stone, with NGL Certificate Sale price¥98,000
メキシコ産ファイアオパール 0.593ctルース

[On sale 9/26 at 10 PM] Mexican Fire Opal 0.593ct Loose Stone Sale price¥11,800
オーストラリア産ブラックオパール 0.175ctルース

[Available 9/23 at 10 PM] Australian Black Opal 0.175ct Loose Stone Sale price¥12,800
Pt900/Pt850 ブラジル産パライバトルマリン 0.08ct（CuO:2.0%、MnO:1.1%）・ダイヤモンド 0.56ctペンダント（ネックレス）鑑別書

[Available 9/20 at 10 PM] [Colori] Pt900/Pt850 Brazilian Paraiba Tourmaline 0.08ct (CuO: 2.0%, MnO: 1.1%) & Diamond 0.56ct Pendant (Necklace) with Appraisal Report Sale price¥158,000
ブラジル産バイカラートルマリン 2.744ctルース 鑑別書

【Lottery Sale 0818_08】Brazilian Bicolor Tourmaline 2.744ct Loose Stone with Certificate Sale price¥59,800
Brazilian parti-color tourmaline 2.702ct loose stone

Brazilian parti-color tourmaline 2.702ct loose stone Sale price¥69,800
Pt900 トルマリンキャッツアイ 4.598ct ダイヤモンド0.20ctリング 中央宝石研究所ソーティング

[Available 9/18 at 10:00 PM] [Coloriful] Pt900 Tourmaline Cat's Eye 4.598ct Diamond 0.20ct Ring Sale price¥98,000
メキシコ産カンテラオパール 9.166ctルース

[On sale 9/26 at 22:00] Mexican Cantera Opal 9.166ct loose gemstone Sale price¥29,800
メキシコ産カンテラオパール 24.256ctルース

[Available 9/19 at 10 PM] Mexican Cantera Opal 24.256ct Loose Stone Sale price¥69,800
メキシコ産ファイアオパール 0.824ctルース

[9/23 10 PM Sale] Mexican Fire Opal 0.824ct Loose Gemstone Sale price¥12,800
オーストラリア産ブラックオパール 0.322ctルース

[Available 9/24 at 10 PM] Australian Black Opal 0.322ct Loose Gemstone Sale price¥16,800
ブラジル産ルベライト 1.027ctルース

Brazilian Rubellite 1.027ct Loose Stone Sale price¥69,800
アフガニスタン産バイカラートルマリン（通称名：バイカラールベライト） 2.736ctルース

Afghanistan Bicolor Tourmaline (also known as Bicolor Rubellite) 2.736ct loose stone Sale price¥69,800
アフガニスタン産バイカラートルマリン（通称名：バイカラールベライト） 2.888ctルース

Afghanistan Bicolor Tourmaline (also known as Bicolor Rubellite) 2.888ct Loose Sale price¥79,800
モザンビーク産ルベライト 2.752ctルース

Mozambique rubellite 2.752ct loose stone Sale price¥69,800
マダガスカル産パパラチアサファイア 0.261ctルース

Mozambique Rubellite 2.141ct Loose Stone Sale price¥69,800
Elbaite tourmaline from Mozambique 1.192ct loose stone (CuO: 0.1%, MnO: 1.5%)

Elbaite tourmaline from Mozambique 1.192ct loose stone (CuO: 0.1%, MnO: 1.5%) Sale price¥55,800
非加熱ブラジル産パライバトルマリン 0.051ctルース（CuO:2.0%、MnO:2.3%）

Unheated Brazilian Paraiba Tourmaline 0.051ct loose stone (CuO: 2.0%, MnO: 2.3%) Sale price¥39,800
K18YG ブラジル産パライバトルマリン 0.066ct ダイヤモンド0.091ctペンダント（ネックレス）ソーティング

[Lottery Sale 0829] K18YG Brazilian Paraiba Tourmaline 0.066ct Diamond 0.091ct Pendant (Necklace) with Sorting Sale price¥158,000
メキシコ産ファイアオパール（ファセットカット） 1.255ctルース

[Available 9/11 at 10:00 PM] Mexican Fire Opal (faceted cut) 1.255ct loose stone Sale price¥49,800
オーストラリア産ホワイトオパール 0.584ctルース

[Available Sept 13, 10 PM] Australian White Opal 0.584ct Loose Stone (Rose Cut) Sale price¥8,800
ブラジル産バイカラートルマリン 3.337ctルース

[9/7 10 PM Release] Brazilian Bicolor Tourmaline 3.337ct Loose Stone Sale price¥59,800
K18/Pt950 ブラジル産パライバトルマリン 0.053ct リング

[Lottery Sale 3][For Winners Only][Listed as 22602615] K18/Pt950 Brazilian Paraiba Tourmaline 0.053ct Ring (CuO: 1.4%, MnO: 3.1%) Sale price¥158,000
ブラジル産パライバトルマリン 4.022ctルース

[Available 9/5 at 10 PM] Brazilian Paraiba Tourmaline 4.022ct Loose Gemstone Sale price¥45,800
ブラジル産パライバトルマリン 20.766ct原石

[Available 9/5 at 10 PM] 20.766ct Brazilian Paraiba Tourmaline Rough Stone Sale price¥25,800
ブラジル産パライバトルマリン 20.758ct原石

[9/5 10 PM Sale] Brazilian Paraiba Tourmaline 20.758ct Rough Stone Sale price¥29,800
ブラジル産パライバトルマリン 20.343ct原石

【9/5 22:00 Release】 Brazilian Paraiba Tourmaline 20.343ct Rough Stone Sale price¥15,800
ブラジル産パライバトルマリン 8.246ct原石

[Available 9/5, 10 PM] 8.246ct Rough Paraiba Tourmaline from Brazil Sale price¥25,800
【12550850掲載】モザンビーク産ピンクトルマリン 1.122ctルース

Mozambique Pink Tourmaline 1.122ct Loose Stone (Contains CuO) Sale price¥39,800
ブラジル産インディゴライトトルマリン 3.756ctルース

Lottery Sale 0812_15: Brazilian Indicolite Tourmaline 3.756ct Loose Stone with Japan-Germany Gemological Report Sale price¥98,000
Brazilian Paraiba Tourmaline 0.037ct Loose (CuO:1.9%, MnO:2.3%)

Brazilian Paraiba Tourmaline 0.037ct Loose (CuO:1.9%, MnO:2.3%) Sale price¥29,800
Paraiba Tourmaline from Brazil 0.067 ct loose (CuO: 1.4%, MnO: 2.4%)

Paraiba Tourmaline from Brazil 0.067 ct loose (CuO: 1.4%, MnO: 2.4%) Sale price¥39,800
Brazilian Paraiba Tourmaline 0.821ct rough stone

Brazilian Paraiba Tourmaline 0.821ct rough stone Sale price¥39,800
ブラジル産パライバトルマリン 0.239ctルース（CuO:1.0%、MnO:3.9%）

Brazilian Alexandrite 0.239ct Loose Gemstone [Listed as 12564071] Sale price¥45,800
Pt900 オパール 1.10ct ダイヤモンド0.46ctリング

【Available 9/9 at 10 PM】【Colori】Pt900 Opal 1.10ct Diamond 0.46ct Ring Sale price¥98,000
バイカラートルマリン 1.753ctルース

[9/7 22:00 Release] Brazilian Bicolor Tourmaline 1.753ct Loose Stone Sale price¥29,800
非加熱ブラジル産パライバトルマリン 0.079ctルース（CuO:1.8%、MnO:2.6%）

Unheated Brazilian Paraiba Tourmaline 0.079ct loose stone (CuO: 1.8%, MnO: 2.6%) Sale price¥45,800
ブラジル産ピンクトルマリン 1.458ctルース

Brazilian pink tourmaline 1.458ct loose stone Sale price¥39,800
アマゾン産グリーンオパール 0.814ctルース

Amazon Green Opal 0.814ct Loose (Faceted Cut) Sale price¥7,980
アマゾン産グリーンオパール 0.517ctルース

Amazonian green opal 0.517ct loose stone (faceted cut) Sale price¥7,980
アマゾン産グリーンオパール 0.285ctルース

Amazon Green Opal 0.285ct Loose (Faceted Cut) Sale price¥6,980
ブラジル産トルマリン（無処理） 5.120ctルース

Brazilian Tourmaline (untreated) 5.120ct loose stone Sale price¥39,800

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.

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.