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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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Single loose Russian oil-free emerald (1.6-1.7mm, princess cut) {Multiple purchase discounts available}

Single loose Russian oil-free emerald (1.6-1.7mm, princess cut) {Multiple purchase discounts available} Sale price¥9,800
コロンビア産ミントカラーエメラルド 0.214ctルース

Colombian mint-colored emerald 0.214ct loose stone Sale price¥8,800
ザンビア産エメラルド 0.159ctルース

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

Zambian emerald 0.135ct loose stone Sale price¥8,800
ブラジル産エメラルド 0.945ctルース

Brazilian mint-colored emerald 0.945ct loose stone Sale price¥25,800
コロンビア産ミントカラーエメラルド 0.306ctルース

Colombian mint-colored emerald, 4.3mm/0.306ct loose stone 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
Afghanistan Oil-Free Emerald 0.100ct Loose GIA

Afghanistan Oil-Free Emerald 0.100ct Loose GIA Sale price¥98,000
0.060ct loose, oil-free emerald from Madagascar, GIA

0.060ct loose, oil-free emerald from Madagascar, GIA Sale price¥69,800
エメラルド 9.380ct原石

[12541081 published] Emerald 9.380ct rough stone Sale price¥4,980
【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
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
コロンビア産エメラルド 0.202ctルース

Colombian emerald 0.202ct loose stone Sale price¥59,800
[Limited to 6 stones] Contains 2 stones in total: 1 gemstone (rough stone) that is actually featured in a gemstone encyclopedia + 1 emerald rough stone.

[Limited to 6 stones] Contains 2 stones in total: 1 gemstone (rough stone) that is actually featured in a gemstone encyclopedia + 1 emerald rough stone. Sale price¥4,980
コロンビア産パイライトインエメラルド 27.414ctルース

Colombian pyrite emerald 27.414ct loose stone Sale price¥298,000
コロンビア産トラピッチェエメラルド 1.343ctルース

Colombian Trapiche Emerald 1.343ct Loose Sale price¥69,800
コロンビア産トラピッチェエメラルド 0.811ctルース

Colombian Trapiche Emerald 0.811ct Loose Sale price¥59,800
コロンビア産エメラルド 0.126ctルース

Colombian emerald 0.126ct loose stone Sale price¥15,800
ザンビア産エメラルド 0.181ctルース

Zambian emerald 0.181ct loose stone Sale price¥8,800
ザンビア産エメラルド 0.099ctルース

Zambian emerald 0.099ct loose stone Sale price¥9,800
コロンビア産パイライトインエメラルド 15.291ctルース

Colombian pyrite in emerald 15.291ct loose Sale price¥1,000,000
コロンビア産トラピッチェエメラルド 0.923ct原石

Colombian Trapiche Emerald 0.923ct Rough Stone Sale price¥45,800
K18YG レッドベリル 0.239ct リング

K18YG American Red Beryl 0.239ct Emerald, Red Beryl and Diamond Ring by Nikkei Sale price¥158,000
コロンビア産エメラルド 0.150ctルース

Colombian emerald 3.5mm/0.150ct loose stone Sale price¥22,800
エメラルド 0.484ルース

Emerald 0.484ct loose Sale price¥18,800
コロンビア産トラピッチェエメラルド 1.494ctルース

Colombian Trapiche Emerald 1.494ct Loose Sale price¥69,800
コロンビア産パイライト・雲母インエメラルド 0.739ctルース

Colombian pyrite-mica emerald 0.739ct loose stone Sale price¥36,800
コロンビア産パイライト・雲母インエメラルド 0.628ctルース

Colombian pyrite-mica emerald 0.628ct loose stone Sale price¥35,800
コロンビア産エメラルド 0.231ctルース

Colombian emerald 0.231ct loose stone Sale price¥28,800
コロンビア産トラピッチェエメラルド 0.372ctルース

Colombian Trapiche Emerald 0.372ct Loose Sale price¥19,800
コロンビア産トラピッチェエメラルド 0.299ctルース

Colombian Trapiche Emerald 0.299ct Loose Sale price¥16,800
コロンビア産パイライトインエメラルド 13.691ctルース

Colombian pyrite emerald 13.691ct loose stone Sale price¥398,000
エメラルド 0.308ctルース

Emerald 0.308ct loose stone Sale price¥14,800
コロンビア産パイライトインエメラルド 6.415ctルース

Colombian pyrite in emerald 6.415ct loose stone Sale price¥298,000
コロンビア産ノンオイルエメラルド 0.290ctルース GIA

Colombian oil-free emerald 0.290ct loose stone GIA Sale price¥198,000
コロンビア産エメラルド ルース・原石2石セット（ラウンドカット3mm）

Colombian emerald loose rough stone set of 2 stones (round cut 3mm)《Multiple purchase discount available》 Sale price¥6,980
coming soon コロンビア産エメラルド 0.286ctルース

【7/28 22時販売】コロンビア産エメラルド 4.5mm/0.286ctルース 宝貴協 Sale price¥69,800
Sold out K18 翡翠（ヒスイ） 1.051ct ペンダントトップ（ネックレストップ）

[Listed 22602671] [Karahuri] K18 Jadeite (Jade) 1.051ct Pendant Top
Sold out コロンビア産パイライトインエメラルド 4.222ctルース

[Lottery Sale 4][For Winners Only][Listed as 12563887] Colombian Pyrite in Emerald 4.222ct Loose Stone

Sold out Pt900 エメラルド 0.30ct ・ダイヤモンド0.01ctペンダントトップ（ネックレストップ）

[On sale July 16th at 10 PM] [Colorfri] Pt900 Emerald 0.30ct & Diamond 0.01ct Pendant Top
Sold out [Sales start 10 PM on 6/26] Limited to 30 sets: 1 in 10 is a pair of 2 stones - Zambian emerald loose stone (approx. 6x4mm, emerald cut) with deep color. (Multiple purchase discount available)

[Sales start 10 PM on 6/26] Limited to 30 sets: 1 in 10 is a pair of 2 stones - Zambian emerald loose stone (approx. 6x4mm, emerald cut) with deep color. (Multiple purchase discount available)

Sold out [Sale 10 PM on June 5] "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose-cut, and mint-colored emeralds, normally priced at 88,800 yen (multiple purchase discount available)

[Sale 10 PM on June 5] "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose-cut, and mint-colored emeralds, normally priced at 88,800 yen (multiple purchase discount available)
Sold out コロンビア産エメラルド 0.167ctルース

Colombian emerald 0.167ct loose stone with jewel
Sold out コロンビア産パイライト・雲母インエメラルド 0.844ctルース

Colombian pyrite-mica emerald 0.844ct loose stone
Sold out 【12562862掲載】コロンビア産トラピッチェエメラルド 0.448ctルース

Colombian Trapiche Emerald, 0.446 ct, Loose Stone, with Certificate
Sold out Non-Oil Emerald 0.555ct Loose Stone by Nikkei

Non-Oil Emerald 0.555ct Loose Stone by Nikkei
Sold out Pt950 ブラジル産バイカラーエメラルド 1.084ct リング

[Sales start 10 PM, May 26th] Colorful: Pt950 Brazilian Bi-Color Emerald 1.084ct and Ice Blue Diamond 0.062ct Ring

Sold out [Sales start 10:00 PM on May 4th] Colombian non-oil emerald (NONE) 0.060ct loose GIA

[Sales start 10:00 PM on May 4th] Colombian non-oil emerald (NONE) 0.060ct loose GIA

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.