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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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【12/31 22時販売】《限定15石》ブルー石ガチャ（ブラジル産パライバトルマリン0.157ct・ドイツ産アウイナイト3.5mm・トップクオリティのベニトアイト・パライバトルマリンインクォーツ4.5mm・カスタムカットのアクアマリン）《複数購入割引有》

【12/31 22時販売】《限定15石》ブルー石ガチャ（ブラジル産パライバトルマリン0.157ct・ドイツ産アウイナイト3.5mm・トップクオリティのベニトアイト・パライバトルマリンインクォーツ4.5mm・カスタムカットのアクアマリン）《複数購入割引有》 Sale price¥6,980
Sold out [Available at 10 PM on January 1st] Limited to 10 Blue Stones Gacha ① (Paraiba Tourmaline from Brazil, Paraiba Tourmaline from Mozambique, Auchenite and Benitoite from Germany) [Multiple purchase discounts available]

[Available at 10 PM on January 1st] Limited to 10 Blue Stones Gacha ① (Paraiba Tourmaline from Brazil, Paraiba Tourmaline from Mozambique, Auchenite and Benitoite from Germany) [Multiple purchase discounts available]
Sold out パンダカットガチャ💎ブラジル産パライバトルマリン（0.226ct/CuO:0.7%,MnO:2.5%）1石・パンダカット5石《複数購入割引有》

パンダカットガチャ💎ブラジル産パライバトルマリン（0.226ct/CuO:0.7%,MnO:2.5%）1石・パンダカット5石《複数購入割引有》
[Available at 10 PM on December 31st] [Limited to 20 stones] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) [Multiple purchase discounts available]

[Available at 10 PM on December 31st] [Limited to 20 stones] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) [Multiple purchase discounts available] Sale price¥9,800
coming soon 【1/17 22時販売】オーストラリア産ブラックオパール 1.091ctルース

【1/17 22時販売】オーストラリア産ブラックオパール 1.091ctルース Sale price¥9,800
モザンビーク産パライバトルマリン 0.270ctルース

Paraiba tourmaline from Mozambique 0.270ct loose Sale price¥18,800
メキシコ産ウォーターオパール 1.790ctルース

Mexican Water Opal 1.790ct Loose (Contralus Opal) Sale price¥29,800
Paraiba tourmaline from Brazil 0.066ct loose

Paraiba tourmaline from Brazil 0.066ct loose Sale price¥18,800
【1/12 22時販売】K18YGブラジル産パライバトルマリン 0.048ctダイヤモンドピンキーリング（CuO:1.7%,MnO:2.2% ）

【1/12 22時販売】K18YGブラジル産パライバトルマリン 0.048ctダイヤモンドピンキーリング（CuO:1.7%,MnO:2.2% ） Sale price¥98,000
【1/12 22時販売】K18/Pt950 ブラジル産パライバトルマリン・ダイヤモンドペンダントトップ（ネックレストップ）

【1/12 22時販売】K18/Pt950 ブラジル産パライバトルマリン・ダイヤモンドペンダントトップ（ネックレストップ） Sale price¥89,800
[1/11 22:00 Sale] Brazilian Green Tourmaline 4.345ct Loose Stone

[1/11 22:00 Sale] Brazilian Green Tourmaline 4.345ct Loose Stone Sale price¥69,800
[12559052] Brazilian Blue Tourmaline 0.827ct Loose

[12559052] Brazilian Blue Tourmaline 0.827ct Loose Sale price¥19,800
[On Sale at 10 PM on January 9th] Brazilian Indigolite Tourmaline 0.421ct Loose Stone with Certificate of Authenticity

[On Sale at 10 PM on January 9th] Brazilian Indigolite Tourmaline 0.421ct Loose Stone with Certificate of Authenticity Sale price¥35,800
[On Sale at 10 PM on January 6th] Mexican Water Opal (Faceted) 0.215ct Loose (Contralus Opal)

[On Sale at 10 PM on January 6th] Mexican Water Opal (Faceted) 0.215ct Loose (Contralus Opal) Sale price¥18,800
[On Sale at 10 PM on January 6th] Brazilian Indigolite Tourmaline 1.470ct Loose Stone with Certificate of Authenticity

[On Sale at 10 PM on January 6th] Brazilian Indigolite Tourmaline 1.470ct Loose Stone with Certificate of Authenticity Sale price¥98,000
[1/4 22:00 Sale] Australian White Opal 1.175ct Loose

[1/4 22:00 Sale] Australian White Opal 1.175ct Loose Sale price¥9,800
[On Sale at 10 PM on January 9th] Brazilian Paraiba Tourmaline 0.361ct Loose Stone (CuO: 1.0%, MnO: 3.6%)

[On Sale at 10 PM on January 9th] Brazilian Paraiba Tourmaline 0.361ct Loose Stone (CuO: 1.0%, MnO: 3.6%) Sale price¥198,000
[On Sale at 10 PM on January 9th] Brazilian Paraiba Tourmaline 0.115ct Loose Stone (CuO: 2.0%, MnO: 0.6%)

[On Sale at 10 PM on January 9th] Brazilian Paraiba Tourmaline 0.115ct Loose Stone (CuO: 2.0%, MnO: 0.6%) Sale price¥59,800
ミントカラートルマリン 0.198ctルース

Mint color tourmaline 0.198ct loose Sale price¥4,980
ミントカラートルマリン 0.229ctルース

Mint color tourmaline 0.229ct loose Sale price¥4,980
ピンクトルマリン 0.205ctルース

Pink tourmaline 0.205ct loose Sale price¥4,980
メキシコ産ウォーターオパール 1.100ctルース

Mexican water opal 0.212ct loose (contrarus opal) Sale price¥18,800
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
[12/13 10 PM Sale] {Limited to 13 Stones} Tourmaline Gacha: Including Indigolite Tourmaline worth ¥50,000 and Rubellite worth ¥60,000. Plus, get one Canary Yellow Tourmaline. {Multiple Purchase Discounts Available}

[12/13 10 PM Sale] {Limited to 13 Stones} Tourmaline Gacha: Including Indigolite Tourmaline worth ¥50,000 and Rubellite worth ¥60,000. Plus, get one Canary Yellow Tourmaline. {Multiple Purchase Discounts Available} Sale price¥5,980
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
【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
{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
[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 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
[Option] Paraiba Tourmaline component analysis sorting issuance fee

[Option] Paraiba Tourmaline component analysis sorting issuance fee Sale price¥5,000
[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 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 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 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
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 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
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
Opal 0.123ct loose stone

Opal 0.123ct loose stone Sale price¥5,980
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

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.