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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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[On sale November 8th at 10pm] Limited to 9 stones: Carving Gacha (Opal, Tourmaline, Tsavorite Garnet) 1 loose stone [Multiple purchase discounts available]

[On sale November 8th at 10pm] Limited to 9 stones: Carving Gacha (Opal, Tourmaline, Tsavorite Garnet) 1 loose stone [Multiple purchase discounts available] Sale price¥2,980
オーストラリア産オパール 0.286ctルース

Australian opal 0.286ct loose Sale price¥5,980
アマゾン産グリーンオパール 1.120ctルース

Amazon green opal 1.120ct loose Sale price¥3,980
ブラジル産インディゴライトトルマリン 0.431ctルース

[On Sale 11/30 at 10pm] Brazilian Indigolite Tourmaline 0.431ct Loose Stone with Certificate of Authenticity Sale price¥29,800
オーストラリア産ボルダーオパール 3.695ctルース

Australian boulder opal 3.695ct loose Sale price¥14,800
オーストラリア産ボルダーオパール 2.470ctルース

Australian boulder opal 2.470ct loose Sale price¥7,980
Pink tourmaline 0.516ct loose

Pink tourmaline 0.516ct loose Sale price¥5,980
モザンビーク産パライバトルマリン 0.243ctルース

Paraiba tourmaline from Mozambique 0.243ct loose Sale price¥15,800
ブラジル産パーティカラーパライバトルマリン 0.149ctルース（CuO:1.4%、MnO:2.8%）

Particolor Paraiba tourmaline from Brazil 0.149ct loose (CuO:1.4%, MnO:2.8%) Sale price¥59,800
ブラジル産パライバトルマリン 0.144ctルース

Paraiba tourmaline from Brazil 0.144ct loose (CuO:0.9%,MnO:2.8%) Sale price¥55,800
ブラジル産バイカラートルマリン 4.497ctルース

[On Sale 11/26 10pm] Brazilian Bicolor Tourmaline 4.497ct Loose Stone Sale price¥69,800
ブラジル産グリーントルマリン 5.0mm/0.401ctルース（ローズカット）

[On Sale 11/18 10pm] Brazilian Green Tourmaline 5.0mm/0.401ct Loose Stone (Rose Cut) Sale price¥9,800
【12544758掲載】ウッドオパール 24.319ctルース

Wood opal 24.319ct loose Sale price¥45,800
ブラジル産バイカラートルマリン 2.047ctルース

Brazilian bicolor tourmaline 2.047ct loose Sale price¥29,800
Bicolor tourmaline 22.088ct loose

Bicolor tourmaline 22.088ct loose Sale price¥298,000
メキシコ産ファイアオパール 0.182ctルース

Mexican Fire Opal 4.2mm/0.182ct Loose Sale price¥8,800
アフガニスタン産ブルートルマリン 0.326ctルース

Blue tourmaline from Afghanistan 4.5mm/0.326ct loose Sale price¥7,980
[On sale November 8th at 10pm] Limited to 4 stones: Carving Gacha (pink tourmaline, average 3.4 carats) 1 loose stone [Multiple purchase discounts available]

[On sale November 8th at 10pm] Limited to 4 stones: Carving Gacha (pink tourmaline, average 3.4 carats) 1 loose stone [Multiple purchase discounts available] Sale price¥3,980
ブラジル産インディゴライトトルマリン 0.210ctルース 鑑別書

[On Sale 11/9 at 10pm] Brazilian Indigolite Tourmaline 0.210ct Loose Stone with Certificate of Authenticity Sale price¥9,800
1 stone of Brazilian blue tourmaline (3 x 4 mm pear shape/oval cut/3 x 5 mm pear shape/4 x 5 mm oval cut)《Discount available for multiple purchases》

1 stone of Brazilian blue tourmaline (3 x 4 mm pear shape/oval cut/3 x 5 mm pear shape/4 x 5 mm oval cut)《Discount available for multiple purchases》 Sale priceFrom ¥2,980
ピンクオパール・ブルーオパール2石セット（小・大サイズ） - KARATZ STORE｜カラッツSTORE

Pink opal/blue opal 2 stone set (small/large size)《Discount available for multiple purchases》 Sale priceFrom ¥1,980
1 green opal from Amazon《Discount available for multiple purchases》

1 green opal from Amazon《Discount available for multiple purchases》 Sale price¥2,980
[Limited to 24 stones] Tourmaline Gacha💎Indigolite tourmaline, clover cut, and other single loose stones {Multiple purchase discounts available}

[Limited to 24 stones] Tourmaline Gacha💎Indigolite tourmaline, clover cut, and other single loose stones {Multiple purchase discounts available} Sale price¥2,580
【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
Limited to 20 stones! Includes 2 Koshu Kiriko fire opals and 1 loose fire opal. Discounts available for multiple purchases.

Limited to 20 stones! Includes 2 Koshu Kiriko fire opals and 1 loose fire opal. Discounts available for multiple purchases. Sale price¥4,980
{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 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases.

Limited to 10 stones: Brazilian Bicolor Tourmaline (Baguette Cut) - 1 loose stone. Discounts available for multiple purchases. Sale price¥3,980
[Option] Paraiba Tourmaline component analysis sorting issuance fee

[Option] Paraiba Tourmaline component analysis sorting issuance fee Sale price¥5,000
[On sale 10/19 at 10 PM] {Limited to 10 stones} Paraiba Tourmaline Gacha 💎 Paraiba Tourmaline or Paraiba Tourmaline in Quartz (1 loose stone) {Multiple purchase discounts available}

[On sale 10/19 at 10 PM] {Limited to 10 stones} Paraiba Tourmaline Gacha 💎 Paraiba Tourmaline or Paraiba Tourmaline in Quartz (1 loose stone) {Multiple purchase discounts available} Sale price¥6,980
Limited to 16 stones: Loose tourmaline gemstones with special cuts, including Sakura in cut (from Congo) and Dandelion cut (from Brazil) (Multiple purchase discounts available)

Limited to 16 stones: Loose tourmaline gemstones with special cuts, including Sakura in cut (from Congo) and Dandelion cut (from Brazil) (Multiple purchase discounts available) Sale price¥4,980
Limited to 9 stones: 1 loose Mexican opal stone (multiple purchase discounts available)

Limited to 9 stones: 1 loose Mexican opal stone (multiple purchase discounts available) Sale price¥1,980
Limited to 12 stones: Mexican opal (custom faceted cut) - 1 loose stone (multiple purchase discounts available)

Limited to 12 stones: Mexican opal (custom faceted cut) - 1 loose stone (multiple purchase discounts available) Sale price¥3,980
Limited to 9 stones: 1 loose Australian opal (faceted cut) [Multiple purchase discounts available]

Limited to 9 stones: 1 loose Australian opal (faceted cut) [Multiple purchase discounts available] Sale price¥3,980
Limited to 15 stones, 1 loose Australian iron opal stone, multiple purchase discounts available

Limited to 15 stones, 1 loose Australian iron opal stone, multiple purchase discounts available Sale price¥3,980
Limited to 9 stones [Mr. Sanjay] Oil in quartz, spinel, yellow opal 1 loose stone (damaged) [Multiple purchase discount available]

Limited to 9 stones [Mr. Sanjay] Oil in quartz, spinel, yellow opal 1 loose stone (damaged) [Multiple purchase discount available] Sale price¥2,980
《Limited to 7 stones》1 stone tourmaline in quartz from Sri Lanka loose (8-9mm, octagonal cut)《Multiple purchase discount available》

《Limited to 7 stones》1 stone tourmaline in quartz from Sri Lanka loose (8-9mm, octagonal cut)《Multiple purchase discount available》 Sale price¥3,980
[On sale November 1st at 10 PM] [Limited to 12 stones] Brazilian Indigolite Tourmaline Gacha Loose Stone (4x3mm, Oval Cut) [Multiple purchase discounts available]

[On sale November 1st at 10 PM] [Limited to 12 stones] Brazilian Indigolite Tourmaline Gacha Loose Stone (4x3mm, Oval Cut) [Multiple purchase discounts available] Sale price¥4,980
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

Additional charge: K18WG (base metal) + 10,000 yen Sale price¥18,800
Limited to 8 stones: Ethiopian black opal (heat-treated, identification instructions included, average 2ct, approx. 11x8mm) 1 loose stone (multiple purchase discounts available)

Limited to 8 stones: Ethiopian black opal (heat-treated, identification instructions included, average 2ct, approx. 11x8mm) 1 loose stone (multiple purchase discounts available) Sale price¥8,800
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¥188,000
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
Limited to 8 stones: Mexican Hyalite Opal Loose (Large 4ct, Fluorescent even in sunlight) Multiple purchase discounts available

Limited to 8 stones: Mexican Hyalite Opal Loose (Large 4ct, Fluorescent even in sunlight) Multiple purchase discounts available Sale price¥4,980
オーストラリア産ホワイトオパール 2.092ctルース

Australian white opal 2.092ct loose stone Sale price¥9,800
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

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.