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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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《Limited to 18 Stones》Brazilian Paraiba Tourmaline Gacha with Sorting (CuO: 2.1%, MnO: 2.2%) Normally 45,800 JPY《Multiple Purchase Discount Available》

《Limited to 18 Stones》Brazilian Paraiba Tourmaline Gacha with Sorting (CuO: 2.1%, MnO: 2.2%) Normally 45,800 JPY《Multiple Purchase Discount Available》 Sale price¥9,800
{For beginners} Gem gacha💎 1 loose gemstone (Chrome tourmaline, Mahenge spinel, etc.) cut by Sri Lankan craftsman Sanjay {Multiple purchase discounts available}

{For beginners} Gem gacha💎 1 loose gemstone (Chrome tourmaline, Mahenge spinel, etc.) cut by Sri Lankan craftsman Sanjay {Multiple purchase discounts available} Sale price¥3,980
Limited to 20 stones: Brazilian Paraiba tourmaline (cabochon cut, approximately 2.2 mm) [Multiple purchase discounts available]

Limited to 20 stones: Brazilian Paraiba tourmaline (cabochon cut, approximately 2.2 mm) [Multiple purchase discounts available] Sale price¥9,800
【5/21 22時販売】【KEN氏】 メキシコ産オパール1石（約3.5mm）《複数購入割引有》 - カラッツSTORE

1 Mexican opal (approx. 3.5mm) {Multiple purchase discounts available} Sale price¥3,980
[On Sale August 2nd at 10 PM JST] Limited to 12 Stones: Blue Gemstone Gacha (Paraiba Tourmaline, Euclase, Tanzanite, etc.) + 1 Aquamarine Stone Included (Bulk Purchase Discount Available)

[On Sale August 2nd at 10 PM JST] Limited to 12 Stones: Blue Gemstone Gacha (Paraiba Tourmaline, Euclase, Tanzanite, etc.) + 1 Aquamarine Stone Included (Bulk Purchase Discount Available) Sale price¥7,980
Limited to 20 Stones: Indicolite Tourmaline Gacha with 5 Stones & Certificate – 1 Loose Stone (Multiple Purchase Discount Available)

Limited to 20 Stones: Indicolite Tourmaline Gacha with 5 Stones & Certificate – 1 Loose Stone (Multiple Purchase Discount Available) Sale price¥3,980
Limited to 10 stones: Australian Opal Lottery with Certificate of Authenticity (including Australian Black Opal) (plus 1 Mexican Fire Opal) (Multiple purchase discounts available)

Limited to 10 stones: Australian Opal Lottery with Certificate of Authenticity (including Australian Black Opal) (plus 1 Mexican Fire Opal) (Multiple purchase discounts available) Sale price¥6,980
1 stone of green opal from South Africa (discount available for multiple purchases)

1 stone of green opal from South Africa (discount available for multiple purchases) Sale priceFrom ¥2,980
[Option] Paraiba Tourmaline component analysis sorting issuance fee

[Option] Paraiba Tourmaline component analysis sorting issuance fee Sale price¥5,000
《Limited to 11 Stones》Rouge Cut & Heart Shaped Gemstone Gacha Usually ¥18,800💎 Almandine Garnet, Pink Tourmaline, Scolite, Sapphire《Multiple Purchase Discount Available》

《Limited to 11 Stones》Rouge Cut & Heart Shaped Gemstone Gacha Usually ¥18,800💎 Almandine Garnet, Pink Tourmaline, Scolite, Sapphire《Multiple Purchase Discount Available》 Sale price¥4,980
Tucson New Arrivals / Limited to 28 Stones: Australian Andamooka Black Matrix Opal (Carbon Treated) 1 Loose Stone (Multi-purchase Discount Available)

Tucson New Arrivals / Limited to 28 Stones: Australian Andamooka Black Matrix Opal (Carbon Treated) 1 Loose Stone (Multi-purchase Discount Available) Sale price¥3,980
《New Tucson Arrivals - Limited to 13 Stones》Mexican Opal, including B-grade stones (Egg-in-Opal and Water Opal) 《Multiple Purchase Discount Available》

《New Tucson Arrivals - Limited to 13 Stones》Mexican Opal, including B-grade stones (Egg-in-Opal and Water Opal) 《Multiple Purchase Discount Available》 Sale price¥2,980
Limited to 13 stones: Mexican Opal (Cabochon Cut) Gacha (Multiple purchase discounts available)

Limited to 13 stones: Mexican Opal (Cabochon Cut) Gacha (Multiple purchase discounts available) Sale price¥2,980
宝石ガチャ💎バゲットカットのトルマリン1石💎4×2mm《複数購入割引有》

Gem gacha💎1 baguette cut tourmaline stone💎4×2mm《Discount available for multiple purchases》 Sale price¥1,980
Tucson New Arrivals / Limited 18 Pieces / Peruvian Blue Opal, 1 piece / Bulk Purchase Discount Available

Tucson New Arrivals / Limited 18 Pieces / Peruvian Blue Opal, 1 piece / Bulk Purchase Discount Available Sale price¥3,980
宝石ガチャ💎ハートシェイプのトルマリン1石💎4mm《複数購入割引有》

Gem Gacha💎Heart-shaped tourmaline 1 stone💎4mm《Multiple purchase discount available》 Sale price¥2,980
Limited to 11 stones: Sakura-shaped Contralus Opal and a specially cut Opal Gacha with one loose stone. Discounts available for multiple purchases.

Limited to 11 stones: Sakura-shaped Contralus Opal and a specially cut Opal Gacha with one loose stone. Discounts available for multiple purchases. Sale price¥3,980
"7-Piece Limited Edition" Mexican Opal, up to 11ct, including some with minor flaws. Multiple purchase discount available.

"7-Piece Limited Edition" Mexican Opal, up to 11ct, including some with minor flaws. Multiple purchase discount available. Sale price¥3,980
宝石ガチャ💎プリンセスカットのトルマリン1石💎 3mm《複数購入割引有》

Gem Gacha💎Princess cut tourmaline 1 stone💎 3mm《Multiple purchase discount available》 Sale price¥2,980
Limited to 8 stones: 1 Mexican fire opal loose stone with unique color (up to 2.2ct) Multiple purchase discounts available

Limited to 8 stones: 1 Mexican fire opal loose stone with unique color (up to 2.2ct) Multiple purchase discounts available Sale price¥3,980
Limited to 7 stones: 1 loose Australian iron opal (average 7ct, October birthstone opal) Multiple purchase discounts available

Limited to 7 stones: 1 loose Australian iron opal (average 7ct, October birthstone opal) Multiple purchase discounts available Sale price¥4,980
K18YGブラジル産パライバトルマリン0.047 リング

K18YG Brazilian Paraiba Tourmaline Ring (Flucche Setting, Pear Shape, Matte Finish) Sale price¥69,800
ブラジル産パライバトルマリンリング・ハーフエタニティリングセット（1.2mm）

Brazilian Paraiba Tourmaline Ring and Half Eternity Ring Set (1.2mm) Sale price¥198,000
Limited to 23 stones: Ethiopian Opal, 1 loose sphere (4.5-5.0mm) - Multiple purchase discounts available

Limited to 23 stones: Ethiopian Opal, 1 loose sphere (4.5-5.0mm) - Multiple purchase discounts available Sale price¥5,980
[Option] Paraiba tourmaline analysis report attached identification certificate issuance fee

[Option] Paraiba tourmaline analysis report attached identification certificate issuance fee Sale price¥15,000
《Tucson New Arrival - Limited to 8 Stones》Zambian Canary Yellow Tourmaline Average 0.47ct《Bulk Purchase Discount Available》

《Tucson New Arrival - Limited to 8 Stones》Zambian Canary Yellow Tourmaline Average 0.47ct《Bulk Purchase Discount Available》 Sale price¥7,980
宝石ガチャ💎クッションカットのトルマリン1石💎 4mm《複数購入割引有》

Gem Gacha💎1 cushion cut tourmaline stone💎 4mm《Multiple purchase discount available》 Sale price¥2,980
Opal 0.123ct loose stone

Opal 0.123ct loose stone Sale price¥5,980
Limited to 7 stones: 1 loose Australian boulder opal (average 25 carats) Multiple purchase discounts available

Limited to 7 stones: 1 loose Australian boulder opal (average 25 carats) Multiple purchase discounts available Sale price¥8,800
Limited to 12 stones Tanzanian Milky Opal Cat's Eye (7.5 x 5.5 mm) Multiple purchase discounts available

Limited to 12 stones Tanzanian Milky Opal Cat's Eye (7.5 x 5.5 mm) Multiple purchase discounts available Sale price¥3,980
Mexican Hyalite Opal 2.592ct loose

Mexican Hyalite Opal 2.592ct loose Sale price¥9,800
ブラジル産ピンクトルマリン 0.400ctルース

[On sale August 22nd, 10 PM JST] Brazilian pink tourmaline 4.9mm/0.400ct loose stone, Hōki Kyō Sale price¥15,800
ブラジル産ブルートルマリン 1.566ctルース

[On sale August 27, 10 PM JST] Brazilian blue tourmaline, 1.566 ct, loose, with appraisal Sale price¥69,800
ブラジル産バイカラートルマリン 1.153ctルース

[12563744 listed] Bi-color Tourmaline from Brazil 1.153ct Loose Stone Sale price¥12,800
ナイジェリア産インディゴライトトルマリン 0.340ctルース

[On sale August 28, 10 PM] Nigerian Indicolite Tourmaline 0.340ct Loose Stone with Certificate Sale price¥29,800
ナイジェリア産インディゴライトトルマリン 0.242ctルース

[Sale on 8/28 at 10 PM] Nigerian Indicolite Tourmaline 0.242 ct Loose Stone with Certificate Sale price¥22,800
ブラジル産インディゴライトトルマリン 0.389ctルース

[Listed as 12563729] Brazilian Indicolite Tourmaline 0.389ct Loose Sale price¥38,800
ブラジル産バイカラートルマリン 1.524ctルース 鑑別書

[Posted as 12563742] Brazilian Bicolor Tourmaline, 1.524 ct loose stone Sale price¥18,800
オーストラリア産ブラックオパール 1.797ctルース 鑑別書

[Posted on 12563864] Australian Black Opal 1.797ct Loose Stone Sale price¥69,800
ブラジル産パーティカラートルマリン 15.355ctルース 鑑別書

[Lottery Sale ②_202608_16] Loose Brazilian Parti-Color Tourmaline 15.355ct Sale price¥39,800
K18WG パライバトルマリン 0.09ct・ダイヤモンド0.06ctリング（CuO:1.0%、MnO:0.4%）ソーティング（一般社団法人 宝石貴金属協会）

[22602666 listed] [Colorful] K18WG Paraiba Tourmaline 0.09ct Ring Sale price¥198,000
ブラジル産バイカラートルマリン 7.489ctルース

Brazilian bicolor tourmaline 7.489ct loose Sale price¥39,800
ブラジル産トルマリンキャッツアイ 0.689ctルース

[Listed as 12564065] Brazilian Tourmaline Cat's Eye 0.689ct Loose Gemstone Sale price¥11,000
オーストラリア産ブラックオパール 1.029ctルース

[Posted as 12563996] Australian Black Opal 1.029ct Loose Stone Sale price¥29,800
ブラジル産パライバトルマリン 0.068ctルース

Brazilian Paraiba Tourmaline 0.068ct loose stone Sale price¥61,800
【#202607 Akihabara Pop-up Store - Currently Removed for Display】[Colorfuri] Pt900 Black Opal 0.83ct / Diamond 0.62ct Ring with Certificate

【#202607 Akihabara Pop-up Store - Currently Removed for Display】[Colorfuri] Pt900 Black Opal 0.83ct / Diamond 0.62ct Ring with Certificate Sale price¥198,000
オーストラリア産ブラックオパール 0.530ctルース

[#202607 Akihabara Pop-up Store - Currently out on display] [Listed under item 12562542] Australian Black Opal 0.530ct Loose Stone Sale price¥14,800
ナイジェリア産インディゴライトトルマリン 0.241ctルース

[On sale August 9, 10 PM] Nigerian Indicolite Tourmaline 0.241ct Loose Stone with Certification Sale price¥25,800

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.