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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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オーストラリア産ボルダーオパール 1.730ctルース

Australian boulder opal 1.730ct loose Sale price¥9,800
オーストラリア産ボルダーオパール 6.980ctルース

Australian boulder opal 6.980ct loose Sale price¥7,980
ブラジル産パライバトルマリンインクォーツ 2.954ctルース

Brazilian Paraiba tourmaline in quartz 2.954ct loose Sale price¥45,800
オーストラリア産ボルダーオパール 4.470ctルース

Australian boulder opal 4.470ct loose Sale price¥29,800
オパール 17.283ctルース

Yellow opal 17.283ct loose Sale price¥34,800
ブラジル産パライバトルマリン 0.340ctルース

Paraiba tourmaline from Brazil 0.34ct loose GIA Sale price¥59,800
【12545837掲載】モザンビーク産パライバトルマリン 0.256ctルース

Paraiba tourmaline from Mozambique 0.256ct loose Sale price¥18,800
Paraiba tourmaline from Mozambique 0.207ct loose

Paraiba tourmaline from Mozambique 0.207ct loose Sale price¥12,800
メキシコ産ファイアオパール 4.5mm/0.244ctルース

Mexican Fire Opal 4.5mm/0.244ct Loose Sale price¥12,800
モザンビーク産パライバトルマリン 0.257ctルース

Paraiba tourmaline from Mozambique 0.215ct loose Sale price¥12,800
ブラジル産パライバトルマリン 0.420ct原石

Brazilian Paraiba tourmaline 0.420ct raw stone (CuO:1.6%, MnO:1.3%) Sale price¥98,000
モザンビーク産パライバトルマリン 0.229ctルース

Paraiba tourmaline from Mozambique 0.229ct loose Sale price¥12,800
【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
モザンビーク産パライバトルマリン 0.388ctルース

Paraiba tourmaline from Mozambique 0.388ct loose Sale price¥24,800
ピンクトルマリン（ローズカット） 0.512ctルース

Pink tourmaline (rose cut) 0.512ct loose Sale price¥8,800
バイカラートルマリン 0.397ctルース

Bicolor tourmaline 0.397ct loose Sale price¥8,800
ブラジル産パライバトルマリン 0.211ctルース（CuO:0.6%,MnO:3.1%）

Paraiba tourmaline from Brazil 0.211ct loose (CuO:0.6%,MnO:3.1%) Sale price¥49,800
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 [On Sale November 3rd at 10 PM] [Limited to 29 stones] Paraiba Tourmaline (Batalha Mine) Loose Gacha Set (Includes 3 Unheated Paraiba Tourmalines) from Brazil💎 [Multiple Purchase Discounts Available]

[On Sale November 3rd at 10 PM] [Limited to 29 stones] Paraiba Tourmaline (Batalha Mine) Loose Gacha Set (Includes 3 Unheated Paraiba Tourmalines) from Brazil💎 [Multiple Purchase Discounts Available]
Sold out [Jeweler's Tools] {3 sets remaining} 3-piece set: Jewelry loupe (14x magnification), blue diamond, and pink tourmaline or sapphire

[Jeweler's Tools] {3 sets remaining} 3-piece set: Jewelry loupe (14x magnification), blue diamond, and pink tourmaline or sapphire
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 15 sets: Two Nigerian tourmaline gemstones (October birthstone) Discounts available for multiple purchases

Limited to 15 sets: Two Nigerian tourmaline gemstones (October birthstone) Discounts 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 1 Brazilian Paraiba tourmaline stone (cabochon cut, average 0.25 ct)

1 Brazilian Paraiba tourmaline stone (cabochon cut, average 0.25 ct)

Sold out 【11/2 22時販売】《限定15石》ブルー石ガチャ（非加熱ブラジル産パライバトルマリン,パライバトルマリン,コバルトガーナイト鑑別書付,インディゴライトトルマリン・サファリン・ベニトアイト・アウイナイト）《複数購入割引有》

【11/2 22時販売】《限定15石》ブルー石ガチャ（非加熱ブラジル産パライバトルマリン,パライバトルマリン,コバルトガーナイト鑑別書付,インディゴライトトルマリン・サファリン・ベニトアイト・アウイナイト）《複数購入割引有》
Sold out Gem Gacha💎1 Paraiba Tourmaline from Brazil (Batalha Mine)

Gem Gacha💎1 Paraiba Tourmaline from Brazil (Batalha Mine)

Sold out [On Sale November 1st at 10 PM] [Limited to 15 Stones] Rare Stone Gacha! 💎 Brazilian Paraiba Tourmaline 0.240ct, Taaffeite, Shinsha, Benitoite, and More [Multiple Purchase Discounts Available]

[On Sale November 1st at 10 PM] [Limited to 15 Stones] Rare Stone Gacha! 💎 Brazilian Paraiba Tourmaline 0.240ct, Taaffeite, Shinsha, Benitoite, and More [Multiple Purchase Discounts Available]
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 《9石限定》ジェムガチャ『春色カラー』💎バイカラートルマリン1石 - カラッツSTORE

Gem Gacha "Spring Colors" 💎 1 Bicolor Tourmaline (Multiple Purchase Discounts Available)

Sold out Brazilian Paraiba tourmaline (Batalha) 1 stone 1.3-1.4mm

Brazilian Paraiba tourmaline (Batalha) 1 stone 1.3-1.4mm

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 [Available at 10 PM on November 30th] Rare Stone Gacha 💎 Cinnabar, Brazilian Paraiba Tourmaline 0.21ct, Red Beryl, Benitoite, and Axinite (Multiple Purchase Discounts Available)

[Available at 10 PM on November 30th] Rare Stone Gacha 💎 Cinnabar, Brazilian Paraiba Tourmaline 0.21ct, Red Beryl, Benitoite, and Axinite (Multiple Purchase Discounts Available)
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 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 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.

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

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

Sold out Gem Gacha💎 1 Paraiba Tourmaline from Brazil (Batalha mine, 2.5-3.0mm, includes blue)

Gem Gacha💎 1 Paraiba Tourmaline from Brazil (Batalha mine, 2.5-3.0mm, includes blue)
Sold out [Limited to 6 stones] [Mr. Sanjay] Mexican opal or Sri Lankan spinel 1 loose stone (with defects) [Multiple purchase discount available]

[Limited to 6 stones] [Mr. Sanjay] Mexican opal or Sri Lankan spinel 1 loose stone (with defects) [Multiple purchase discount available]
Sold out [11/23 10 PM Sale] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) Single Loose Stone (Multiple Purchase Discounts Available)

[11/23 10 PM Sale] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) Single Loose Stone (Multiple Purchase Discounts Available)
Sold out [Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]

[Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]
Sold out Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available

Limited to 5 stones: 1 Mexican Hyalite Opal loose stone (average 0.5ct) Multiple purchase discounts available
Sold out Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》

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

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

Limited to 12 stones! Gemstone Gacha including Brazilian Paraiba Tourmaline rough stone 💎 1 rough stone (Multiple purchase discounts available)
Sold out Limited quantity: Brazilian Paraiba tourmaline, 1 stone loose (Batalha mine, oval cut) Multiple purchase discounts available

Limited quantity: Brazilian Paraiba tourmaline, 1 stone loose (Batalha mine, oval cut) Multiple purchase discounts available
Sold out Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available

Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available
Sold out ブラジル産パライバトルマリン 0.240ctルース

Paraiba tourmaline from Brazil 4.1mm/0.240ct loose

Sold out オーストラリア産ボルダーオパール 52.582ctルース

Australian boulder opal 52.582ct loose

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.