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5月誕生石

May birthstone

The birthstone for May is emerald / jade .

Emerald is a type of beryl, the same mineral as aquamarine, and is the name given to beryl, which contains chromium and has a green color. One of the characteristics is that many of them have scratches and inclusions inside. The most famous and high-quality production area is Colombia. The emerald cut is said to have originated from Colombian emeralds.

Jade is also a gemstone with an impressive green color, but it actually comes in a wide variety of colors, including purple, orange, and white. It is also famous for being mined in Japan, mainly in Niigata and Toyama prefectures, and has been selected as Japan's national stone. Highly transparent green jade called ``Roukan'' is the most valuable.

Karatz GemMagazine
" List of May birthstones and birthstones "

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コロンビア産トラピッチェエメラルド 1.448ctルース

[On Sale at 10 PM on September 22nd] Colombian Trapiche Emerald 1.448ct Loose Sale price¥69,800
コロンビア産雲母インエメラルド 1.314ctルース

Colombian mica in emerald 1.314ct loose Sale price¥39,800
トラピッチェエメラルド 0.650ctルース（逆トラピッチェ）

Trapiche emerald 0.650ct loose (reverse trapiche) Sale price¥6,980
コロンビア産エメラルド 0.222ctルース

[On Sale at 10 PM on September 11th] Colombian Emerald 0.222ct Loose Sale price¥59,800
コロンビア産エメラルド 0.101ctルース

[On Sale at 10 PM on September 19th] Colombian Emerald 0.101ct Loose Sale price¥15,800
[On sale at 10 PM on September 6th] Limited to 8 stones: Kite cut loose stone (Illusion Sunstone, Sapphire, Emerald, Spessartine Garnet, etc.) [Multiple purchase discounts available]

[On sale at 10 PM on September 6th] Limited to 8 stones: Kite cut loose stone (Illusion Sunstone, Sapphire, Emerald, Spessartine Garnet, etc.) [Multiple purchase discounts available] Sale price¥5,980
[On Sale at 10 PM on September 5th] [Limited to 7 stones] One loose, oil-free emerald from Russia (1.6-1.7mm, princess cut) [Multiple purchase discounts available]

[On Sale at 10 PM on September 5th] [Limited to 7 stones] One loose, oil-free emerald from Russia (1.6-1.7mm, princess cut) [Multiple purchase discounts available] Sale price¥9,800
エメラルド 15.219ctルース 日独鑑

Emerald 15.219ct loose Japanese-German book Sale price¥298,000
コロンビア産ミントカラーエメラルド 0.214ctルース

[On Sale at 10 PM on August 31st] Colombian Mint Emerald 0.214ct Loose Sale price¥8,800
ザンビア産エメラルド 0.159ctルース

[On sale at 10pm on September 3rd] Zambian emerald 0.159ct loose stone Sale price¥8,800
ザンビア産エメラルド 0.135ctルース

[On sale at 10pm on September 5th] Zambian emerald 0.135ct loose stone Sale price¥8,800
ザンビア産エメラルド 0.119ctルース

[On sale at 10pm on September 4th] Zambian emerald 0.119ct loose stone Sale price¥12,800
ロシア産エメラルド 0.249ctルース

[On sale at 10pm on September 6th] Russian emerald 0.249ct loose stone Sale price¥158,000
ロシア産エメラルド 0.269ctルース

[On sale at 10pm on September 6th] Russian emerald 0.269ct loose stone Sale price¥79,800
ブラジル産エメラルド 0.945ctルース

[On Sale at 10 PM on September 6th] Brazilian Mint-Colored Emerald 0.945ct Loose Sale price¥25,800
コロンビア産ミントカラーエメラルド 0.244ctルース

[Available at 10 PM on August 24th] Colombian Mint Emerald 4.1mm/0.244ct Loose Stone Sale price¥8,800
コロンビア産ミントカラーエメラルド 0.306ctルース

[Available at 10 PM on August 24th] Colombian Mint Emerald 4.3mm/0.306ct Loose Stone Sale price¥8,800
ブラジル産ミントカラーエメラルド 0.638ctルース

[Available at 10 PM on August 24th] Brazilian Mint-Colored Emerald, 5.5mm/0.638ct Loose Sale price¥8,800
ザンビア産エメラルド 0.138ctルース

[12560252] Zambian emerald 0.138ct loose stone Sale price¥8,800
ザンビア産エメラルド 0.166ctルース

[On sale at 10pm on August 25th] Zambian emerald 0.166ct loose stone Sale price¥8,800
ダイヤモンド 0.054ctルース（VSクラス相当,エメラルドカット）

Diamond 0.054ct loose (VS class equivalent, emerald cut) Sale price¥8,800
【12533505掲載】コロンビア産エメラルドキャッツアイ 0.112ctルース

Colombian emerald cat's eye 0.112ct loose Sale price¥9,800
コロンビア産エメラルドキャッツアイ 0.094ctルース

Colombian emerald cat's eye 0.094ct loose Sale price¥8,800
エメラルドキャッツアイ 0.417ctルース

Colombian emerald cat's eye 0.417ct loose Sale price¥39,800
[On Sale at 10 PM on August 11th] Afghanistan Oil-Free Emerald 0.100ct Loose GIA

[On Sale at 10 PM on August 11th] Afghanistan Oil-Free Emerald 0.100ct Loose GIA Sale price¥98,000
コロンビア産エメラルド 17.581ct原石　日独鑑

[8/11 22:00 Sale] Colombian Emerald 17.581ct Rough Stone, Japan-Germany Qualification Sale price¥45,800
[On Sale at 10 PM on August 11th] 0.060ct Loose GIA Emerald from Madagascar, No Oil

[On Sale at 10 PM on August 11th] 0.060ct Loose GIA Emerald from Madagascar, No Oil Sale price¥69,800
コロンビア産エメラルド 6.590ct原石

[On Sale at 10 PM on August 7th] Colombian Emerald Rough Stone 6.590ct Sale price¥15,800
エメラルド 9.380ct原石

[12541081 published] Emerald 9.380ct rough stone Sale price¥4,980
エメラルド 77.265ct原石

[Posted 12541074] Emerald 77.265ct rough stone Sale price¥6,980
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.107ct原石

Colombian trapiche emerald (reverse trapiche) 0.107ct rough stone Sale price¥9,800
コロンビア産エメラルドキャッツアイ 0.834ctルース

Colombian emerald cat's eye 0.834ct loose Sale price¥39,800
【甲州貴石切子plusthree】コロンビア産パイライトインエメラルド 5.076ctルース ワッペン付

[Koshu Precious Stone Kiriko PlusThree] Colombian Pyrite in Emerald 5.076ct Loose with Patch Sale price¥98,000
【甲州貴石切子】コロンビア産エメラルド 1.701ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Kiriko] Colombian Emerald 1.701ct《Collaboration》With Loose Patch Sale price¥79,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.101ct原石

Colombian trapiche emerald (reverse trapiche) 0.101ct rough stone Sale price¥12,800
ベニトアイト 0.100ctルース（エメラルドカット）

American Benitoite 0.100ct Loose Stone (Emerald Cut) Sale price¥32,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.329ct原石

Colombian Trapiche Emerald (Reverse Trapiche) 4.3mm/0.329ct Rough Stone Sale price¥29,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.134ct原石

Colombian trapiche emerald (reverse trapiche) 0.134ct rough stone Sale price¥12,800
コロンビア産エメラルド 0.202ctルース

Colombian emerald 0.202ct loose stone Sale price¥59,800
Limited to 6 gems! "Gemstone Encyclopedia" Gacha! 💎 1 gemstone (rough stone) from the gemstone encyclopedia + 1 rough emerald, for a total of 2 gems

Limited to 6 gems! "Gemstone Encyclopedia" Gacha! 💎 1 gemstone (rough stone) from the gemstone encyclopedia + 1 rough emerald, for a total of 2 gems Sale price¥8,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.178ct原石

Colombian trapiche emerald (reverse trapiche) 0.178ct rough stone Sale price¥15,800
コロンビア産エメラルドキャッツアイ 0.084ctルース

Colombian emerald cat's eye 0.084ct loose Sale price¥6,980
ベニトアイト 0.150ctルース

American Benitoite 0.150ct loose stone (emerald cut) Sale price¥69,800
コロンビア産エメラルド3.2mm/0.102ctルース

Colombian emerald 10.940ct rough stone Sale price¥69,800
エメラルドキャッツアイ 4.070ctルース

Brazilian cat's eye emerald 4.070ct loose stone Sale price¥198,000
Kyanite from Nepal, 1 loose stone (indigo blue color, 4 x 6 mm, emerald cut) {Multiple purchase discount available}

Kyanite from Nepal, 1 loose stone (indigo blue color, 4 x 6 mm, emerald cut) {Multiple purchase discount available} Sale price¥6,980
コロンビア産エメラルドキャッツアイ 0.421ctルース

Colombian emerald cat's eye 0.421ct loose stone Sale price¥12,800

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.