• 全商品を見る
  • 本日の新着＆更新
  • KARATZの書籍
  • FAQ
  • inquiry
  • See reviews
Login

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
【4/5 22時販売】【宝石商の道具】《残り僅か》宝石用ルーペ（倍率14倍）・ブルーダイヤモンド・ピンクトルマリンorサファイアの3点セット

【4/5 22時販売】【宝石商の道具】《残り僅か》宝石用ルーペ（倍率14倍）・ブルーダイヤモンド・ピンクトルマリンorサファイアの3点セット Sale price¥3,980
【4/13 22時販売】《限定20石》ジェムガチャ💎 ピンクトルマリンのさくらインカットやミントダイオプサイトなど内包物多めやカケ有りの訳あり品のガチャ1石ルース《複数購入割引有》　

【4/13 22時販売】《限定20石》ジェムガチャ💎 ピンクトルマリンのさくらインカットやミントダイオプサイトなど内包物多めやカケ有りの訳あり品のガチャ1石ルース《複数購入割引有》　 Sale price¥3,980
アフガニスタン産シーフォームトルマリン 0.264ctルース

【4/11 22時販売】アフガニスタン産シーフォームトルマリン 4.0mm/0.264ctルース Sale price¥12,800
ブラジル産パライバトルマリンインクォーツ 0.712ctルース

【4/11 22時販売】ブラジル産パライバトルマリンインクォーツ 0.712ctルース Sale price¥15,800
ブラジル産パライバトルマリンインクォーツ 0.735ctルース

【4/13 22時販売】ブラジル産パライバトルマリンインクォーツ 6.0mm/0.735ctルース Sale price¥15,800
ブラジル産パライバトルマリンインクォーツ 0.704ctルース

【4/13 22時販売】ブラジル産パライバトルマリンインクォーツ 6.0mm/0.704ctルース Sale price¥15,800
エチオピア産オパール 0.584ctルース

【4/9 22時販売】エチオピア産オパール 6.0mm/0.584ctルース Sale price¥12,800
ブラジル産パライバトルマリン 0.320ctルース

【4/6 22時販売】ブラジル産パライバトルマリン 0.320ctルース GIA Sale price¥148,000
インディゴライトトルマリン 3.707ctルース

【4/6 22時販売】ブラジル産インディゴライトトルマリン 3.707ctルース 鑑別書 Sale price¥128,000
ブラジル産パライバトルマリン 0.173ctルース（CuO:1.9%、MnO:1.0%）

【4/4 22時販売】ブラジル産パライバトルマリン 0.173ctルース（CuO:1.9%、MnO:1.0%） Sale price¥158,000
メキシコ産オパール 1.465ctルース

【4/1 22時販売】【さくらシェイプ】メキシコ産オパール 8.2mm/1.465ct《コラボ》ルース ワッペン Sale price¥45,800
K18メキシコ産ウォーターオパール 4.3mm/0.175ct リング

【4/5 22時販売】K18メキシコ産ウォーターオパール 4.3mm/0.175ct リング Sale price¥79,800
メキシコ産カンテラオパール 6.629ctルース

【4/1 22時販売】メキシコ産カンテラオパール 6.629ctルース Sale price¥9,800
ブラジル産パライバトルマリン 0.220ctルース

【4/4 22時販売】ブラジル産パライバトルマリン 0.220ctルース（CuO：0.7%,MnO：3.0%）GIT鑑 Sale price¥45,800
モザンビーク産モザンビーク産イリュージョンパライバトルマリン 4.030ctルース

【4/6 22時販売】モザンビーク産イリュージョンパライバトルマリン 4.030ctルース（ CuO:0.3%,MnO:0.9%） Sale price¥98,000
モザンビーク産モザンビーク産イリュージョンパライバトルマリン 2.708ctルース

【3/30 22時販売】モザンビーク産モザンビーク産イリュージョンパライバトルマリン 2.708ctルース（CuO:0.3%,MnO:2.5%） Sale price¥69,800
非加熱ブラジル産パライバトルマリン 0.075ctルース

[On sale 22/3 at 10pm] Unheated Brazilian Paraiba Tourmaline 0.075ct loose stone (CuO: 1.8%, MnO: 2.3%) Sale price¥49,800
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
Limited to 20 stones: Brazilian Paraiba Tourmaline (Batalha mine) 1 loose stone (multiple purchase discounts available)

Limited to 20 stones: Brazilian Paraiba Tourmaline (Batalha mine) 1 loose stone (multiple purchase discounts available) Sale price¥8,800
【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
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 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 Sale price¥1,580
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 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. Sale price¥6,980
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
《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

《9 stones only》Gem gacha "Spring colors"💎Bicolor tourmaline x 1《Multiple purchase discounts available》 Sale price¥6,980
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》 Sale price¥3,980
Limited to 21 stones [Kitty Gacha] Cat cut, blue opal, jade, chalcedony, etc. (One in four people will also receive a paw set) [Multiple purchase discounts available]

Limited to 21 stones [Kitty Gacha] Cat cut, blue opal, jade, chalcedony, etc. (One in four people will also receive a paw set) [Multiple purchase discounts available] Sale price¥7,980
[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
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
[On sale 3/7 at 10pm] {New Arrival in Tucson} Brazilian Paraiba Tourmaline (Batalia) 1 stone 1.2mm {Multiple purchase discounts available}

[On sale 3/7 at 10pm] {New Arrival in Tucson} Brazilian Paraiba Tourmaline (Batalia) 1 stone 1.2mm {Multiple purchase discounts available} 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
[Option] Paraiba Tourmaline component analysis sorting issuance fee

[Option] Paraiba Tourmaline component analysis sorting issuance fee Sale price¥5,000
Limited to 8 stones: 1 Mexican opal loose stone (fire opal, water opal) Discounts for multiple purchases For beginners

Limited to 8 stones: 1 Mexican opal loose stone (fire opal, water opal) Discounts for multiple purchases For beginners Sale price¥5,980
宝石ガチャ💎トルマリン1石（ハートシェイプ）ルース 《複数購入割引有》

Gem Gacha💎Tourmaline 1 stone (heart shape) loose stone {Multiple purchase discount available} Sale price¥3,980
[On sale from 10pm on March 14th] [Limited to 15 stones] [New in Tucson] Australian iron opal, 1 loose stone [Multiple purchase discounts available]

[On sale from 10pm on March 14th] [Limited to 15 stones] [New in Tucson] Australian iron opal, 1 loose stone [Multiple purchase discounts available] Sale price¥3,980
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 Sale price¥5,980
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
1 loose Australian opal (heart shape, 4 x 4mm)《Discount available for multiple purchases》

1 loose Australian opal (heart shape, 4 x 4mm)《Discount available for multiple purchases》 Sale price¥3,980
Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》

Fire Opal (Common Opal) 2 stone set《Discount available for multiple purchases》 Sale price¥3,980
[On sale from 22:00 on 2/2] [Limited to 4 stones] Mexican Cantera Opal 1 loose stone (10 x 8 cm) [Multiple purchase discounts available]

[On sale from 22:00 on 2/2] [Limited to 4 stones] Mexican Cantera Opal 1 loose stone (10 x 8 cm) [Multiple purchase discounts available] Sale price¥4,980

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
[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] Sale price¥3,980
《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
[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 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

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.

The fifth reprint has been decided and is now on sale at bookstores nationwide and online.

Written by KARATZ, book “Jewelry Illustrated Book”

The book provides explanations about over 300 types of gemstones, from new standard birthstones to rare stones that are hard to find, as well as a diary of our company representative, Mr. Koyama's, gemstone shopping experience in Thailand and Sri Lanka, and tips for photographing gemstones, allowing you to learn about the appeal of gemstones from various perspectives.

KARATZ・Five Commitments