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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 0.317ct原石

Colombian Trapiche Emerald 0.317ct Rough Stone Sale price¥19,800
コロンビア産トラピッチェエメラルド 0.424ct原石

Colombian Trapiche emerald 0.424ct rough stone Sale price¥39,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.073ct原石

Colombian Trapiche Emerald (Reverse Trapiche) 0.073ct Rough Stone 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） 0.078ct原石

Colombian trapiche emerald (reverse trapiche) 0.078ct rough stone Sale price¥7,980
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.111ct原石

Colombian Trapiche Emerald (Reverse Trapiche) 0.111ct Rough Stone Sale price¥12,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.183ct原石

Colombian Trapiche Emerald (Reverse Trapiche) 0.183ct Rough Stone Sale price¥18,800
コロンビア産パイライト付きエメラルド 0.248ct原石

Colombian emerald with pyrite 0.248ct rough stone Sale price¥12,800
エメラルド 2.498ctルース

[Clover in cut] Emerald 9mm/2.498ct {Collaboration} Loose with patch Sale price¥98,000
コロンビア産エメラルド 2.018ctルース

[Koshu precious stone cutter pluethree] Colombian emerald 2.018ct loose Sale price¥98,000
ロシア産エメラルド 0.712ctルース

Russian emerald 0.712ct loose Sale price¥59,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.457ct原石

Colombian trapiche emerald (reverse trapiche) 0.457ct rough stone Sale price¥36,800
コロンビア産トラピッチェエメラルド 13.466ctルース

Colombian trapiche emerald 13.466ct loose Sale price¥398,000
ベニトアイト 0.091ctルース（エメラルドカット）

Benitoite 0.091ct loose (emerald cut) Sale price¥29,800
Myanmar orange jade (jade) 0.584ct loose

Myanmar orange jade (jade) 0.584ct loose Sale price¥6,980
Myanmar orange jade (jade) 0.531ct loose

Myanmar orange jade (jade) 0.531ct loose Sale price¥6,980
【クローバーインカット】コロンビア産エメラルド 8mm/1.663ctルース《コラボ》 ワッペン付

[Clover in-cut] Colombian emerald 8mm/1.663ct loose "Collaboration" with patch Sale price¥88,800
Benitoite 0.123ct loose (emerald cut)

Benitoite 0.123ct loose (emerald cut) Sale price¥39,800
Benitoite 0.107ct loose (emerald cut)

Benitoite 0.107ct loose (emerald cut) Sale price¥35,800
Benitoite 0.104ct loose (emerald cut)

Benitoite 0.104ct loose (emerald cut) 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） 0.168ct原石

Colombian trapiche emerald (reverse trapiche) 3.6mm/0.168ct rough stone Sale price¥19,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.135ct原石

Colombian trapiche emerald (reverse trapiche) 0.135ct rough stone Sale price¥14,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.132ct原石

Colombian trapiche emerald (reverse trapiche) 3.4mm/0.132ct rough stone Sale price¥14,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.131ct原石

Colombian trapiche emerald (reverse trapiche) 0.131ct rough stone Sale price¥14,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.107ct原石

Colombian trapiche emerald (reverse trapiche) 3.0mm/0.107ct rough stone (faceted cut) Sale price¥12,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.098ct原石

Colombian trapiche emerald (reverse trapiche) 0.098ct rough stone Sale price¥9,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.091ct原石

Colombian trapiche emerald (reverse trapiche) 3.2mm/ 0.091ct rough stone Sale price¥11,000
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.082ct原石

Colombian trapiche emerald (reverse trapiche) 0.082ct rough stone Sale price¥9,800
コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.078ct原石

Colombian trapiche emerald (reverse trapiche) 3mm/0.078ct rough stone Sale price¥8,800
コロンビア産エメラルドキャッツアイ 0.110ctルース

Colombian emerald cat's eye 0.110ct loose Sale price¥12,800
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
コロンビア産エメラルドキャッツアイ1石ルース（平均0.35ct)《初めての方向け》

Colombian emerald cat's eye 1 stone loose (average 0.35ct)《For first-time users》《Multiple purchase discount available》 Sale price¥12,800
coming soon 【11/29 22時販売】オーストラリア産エメラルド 0.320ctルース

【11/29 22時販売】オーストラリア産エメラルド 0.320ctルース Sale price¥39,800
coming soon コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.072ctルース

Colombian trapiche emerald (reverse trapiche) 0.072ct loose Sale price¥6,980
coming soon コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.095ctルース

Colombian trapiche emerald (reverse trapiche) 0.095ct loose Sale price¥6,980
coming soon コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.113ctルース

Colombian trapiche emerald (reverse trapiche) 0.113ct loose Sale price¥9,800
Sold out コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.053ctルース

Colombian trapiche emerald (reverse trapiche) 0.053ct loose
Sold out コロンビア産エメラルド 0.121ctルース

[11/2 22:00 Sale] Colombian Emerald 0.121ct Loose
Sold out コロンビア産エメラルド 3.9mm/0.200ctルース

[On Sale 11/7 at 10pm] Colombian Emerald 3.9mm/0.200ct Loose
Sold out One loose, oil-free emerald from Russia (2.8mm, round cut) (Multiple purchase discounts available)

One loose, oil-free emerald from Russia (2.8mm, round cut) (Multiple purchase discounts available)
Sold out Limited to 6 stones: One loose, oil-free emerald from Russia (3.2mm, round cut) [Multiple purchase discounts available]

Limited to 6 stones: One loose, oil-free emerald from Russia (3.2mm, round cut) [Multiple purchase discounts available]
Sold out K18YG ミャンマー産翡翠（ヒスイ） 0.434ct・エメラルドリング

18K Yellow Gold Myanmar Jadeite and Emerald 0.434ct Ring
Sold out コロンビア産ノンオイルエメラルド（NONE） 0.110ctルース GIA

[Posted 12548175] Colombian oil-free emerald 0.110ct loose

Sold out ラベンダー翡翠（ヒスイ） 78.496ctルース 中宝

Lavender Jade (Jade) 78.496ct Loose Medium Treasure
Sold out 【12541077掲載】エメラルド 67.796ct原石

[On sale at 10pm on August 7th] 67.796ct rough emerald
Sold out エメラルド 0.111ctルース

Emerald 0.111ct loose
Sold out One loose, oil-free emerald from Russia (2.2mm, round cut) (Multiple purchase discounts available)

One loose, oil-free emerald from Russia (2.2mm, round cut) (Multiple purchase discounts available)

Sold out 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}

Sold out ブラジル産ミントカラーエメラルド 0.281ctルース

Brazilian mint-colored emerald 0.281ct loose stone

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.