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 "
![[On sale from 10pm on 4/13] Limited to 20 stones Gem gacha💎 One loose stone of pink tourmaline Sakura in-cut and mint diopsite with many inclusions and chips (multiple purchase discounts available)](http://store.karatz.jp/cdn/shop/files/collage_ee8d39f0-5dfd-4e3a-aa8c-14a6b8e755a4.png?v=1744419768&width=2000)
![[On sale from 10pm on 4/20] Limited to 5 stones, 1 loose Mexican hyalite opal (average 0.5ct) [Multiple purchase discounts available]](http://store.karatz.jp/cdn/shop/files/collage_e013a3d8-a888-4b9b-a0e2-59246ca0b07d.png?v=1745105671&width=2000)
【5/6 22時販売】オーストラリア産ボルダーオパール 6.160ctルース
Sale price¥18,800
【5/6 22時販売】オーストラリア産ボルダーオパール 4.980ctルース
Sale price¥19,800
【5/5 22時販売】オールラリア産ブラックオパール 2.530ctルース
Sale price¥29,800
【5/6 22時販売】《限定8石》独特な色合いのメキシコ産ファイアオパール1石ルース（最大2.2ct含む）《複数購入割引有》
Sale price¥3,980
【5/5 22時販売】Pt900/Pt850 ブラジル産パライバトルマリン 0.043ct ペンダント（ネックレス）
Sale price¥98,000
【5/5 22時販売】イリュージョンピンクトルマリン（イリデッセンストルマリン） 4.097ctルース
Sale price¥55,800
【5/5 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 5.357ctルース（CuO:0.2%、MnO:4.6%）
Sale price¥98,000
[On sale 5/4 at 10pm] Mexican Cantera Opal 18.00ct loose stone
Sale price¥29,800
[On sale 5/3 at 22:00] Mexican fire opal 1.320ct loose stone
Sale price¥13,800
Mexican water opal 0.304ct loose stone
Sale price¥8,800
[On sale 5/3 at 22:00] Mexican water opal 0.300ct loose
Sale price¥8,800
Mexican water opal 0.404ct loose stone
Sale price¥12,800
[On sale 5/3 at 10pm] Mexican Opal 0.461ct Loose
Sale price¥8,800
[On sale 5/3 at 22:00] Australian opal 0.227ct loose
Sale price¥6,980
[On sale 5/3 at 10pm] Australian Opal 0.371ct Loose
Sale price¥8,800
Australian Opal 0.423ct Loose
Sale price¥6,980
Australian Opal 0.706ct Loose
Sale price¥8,800
Australian Opal 0.633ct Loose
Sale price¥9,800
![[On sale at 10pm on 4/28] Brazilian Paraiba Tourmaline in Quartz 3.678ct loose stone](http://store.karatz.jp/cdn/shop/files/P3284311_ea7175ab-4374-48cb-93d2-c0b2687261a9.jpg?v=1745754832&width=2921)
[12542794] Nigerian pink tourmaline 1.527ct loose stone
Sale price¥18,800
![[On sale from 10pm on 4/26] {7 stones only} Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (damaged) {Multiple purchase discounts available}](http://store.karatz.jp/cdn/shop/files/collage_b7a430e1-0f20-4abd-a80a-4f266df831e4.png?v=1745377088&width=2000)
![[On sale from 10pm on 4/26] {Limited to 2 stones} 1 loose Australian opal (pear cut) {Multiple purchase discounts available}](http://store.karatz.jp/cdn/shop/files/P1010011_f504e07b-e476-4a56-b862-ea240367ae2f.jpg?v=1745376455&width=3272)
[On sale from 10pm on 5/1] Mexican Hyalite Opal 5.2mm/0.439ct Loose
Sale price¥12,800
[On sale from 10pm on 5/1] Mexican Hyalite Opal 5.0mm/0.378ct Loose
Sale price¥11,000
[On sale 5/3 at 22:00] Brazilian pink tourmaline 0.361ct loose stone
Sale price¥9,800
[On sale 4/23 at 10pm] Australian black opal 0.660ct loose
Sale price¥12,800
[On sale 4/23 at 10pm] Australian boulder opal 3.930ct loose
Sale price¥35,800
![[On sale from 10pm on 4/20] Brazilian Paraiba Tourmaline 0.229ct loose stone (CuO: 0.6%, MnO: 1.0%)](http://store.karatz.jp/cdn/shop/files/P3316906.jpg?v=1745102518&width=3073)
![[On sale at 10pm on 4/18] Brazilian Paraiba Tourmaline in Quartz 2.864ct loose stone](http://store.karatz.jp/cdn/shop/files/P4217547_33d96e7e-8a71-4322-a364-721ee08b4d3e.jpg?v=1737852565&width=2906)
![[On sale at 22:00 on 4/18] Brazilian Paraiba Tourmaline in Quartz 2.801ct loose stone](http://store.karatz.jp/cdn/shop/files/P4217505_6ef85642-f45f-483b-9d0e-9f0f4f6d60da.jpg?v=1737852567&width=3245)
[On sale at 10pm on 4/20] Mexican Cantera Opal 3.176ct loose stone
Sale price¥39,800
[On sale at 22:00 on 4/19] Mexican Cantera Opal 2.038ct loose stone
Sale price¥29,800
[12558119] Afghanistan Seafoam Tourmaline 0.426ct Loose Stone
Sale price¥18,800
[12558007] Brazilian green tourmaline 0.270ct loose stone
Sale price¥9,800
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.
