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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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ブラジル産エメラルド 3.3mm/0.119ctルース

Brazilian emerald 3.3mm/0.119ct loose Sale price¥22,800
ブラジル産エメラルドキャッツアイ0.459ctルース

Brazilian emerald cat's eye 0.459ct loose Sale price¥6,980
コロンビア産パイライトインエメラルド 7.836ctルース

Colombian pyrite in emerald 7.836ct loose Sale price¥398,000
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 Sale price¥258,000
コロンビア産エメラルドキャッツアイ 0.190ctルース

Colombian emerald cat's eye 0.190ct loose Sale price¥15,800
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¥8,800
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
エメラルド 0.111ctルース

Emerald 0.111ct loose Sale price¥14,800
エメラルド 15.219ctルース 日独鑑

Emerald 15.219ct loose Japanese-German book Sale price¥298,000
coming soon 【8/25 22時販売】ザンビア産エメラルド 0.166ctルース

【8/25 22時販売】ザンビア産エメラルド 0.166ctルース Sale price¥8,800
coming soon 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
coming soon 【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
coming soon 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
coming soon コロンビア産エメラルドキャッツアイ 0.093ctルース

Colombian emerald cat's eye 0.093ct loose Sale price¥8,800
Sold out [8/10:22 Sale] {Limited to 5 Stones} Pentagon Cut Gacha (Sphene, Sunstone, Emerald, etc.) 1 Loose Stone {Multiple Purchase Discounts Available}

[8/10:22 Sale] {Limited to 5 Stones} Pentagon Cut Gacha (Sphene, Sunstone, Emerald, etc.) 1 Loose Stone {Multiple Purchase Discounts Available}
Sold out エメラルド 27.866ct原石

[Posted in 12541080] Emerald 27.866ct rough stone
Sold out エメラルド 79.202ct原石

[Posted 12541079] Emerald 79.202ct rough stone
Sold out コロンビア産パイライト付きエメラルド 43.368ct原石

Colombian pyrite emerald 43.368ct rough stone
Sold out コロンビア産パイライト付きエメラルド 30.109ct原石

Colombian pyrite emerald 30.109ct rough stone
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） 0.147ct原石

Colombian trapiche emerald (reverse trapiche) 0.147ct rough stone
Sold out ブラジル産アレキサンドライト 0.054ctルース（エメラルドカット）

Brazilian Alexandrite 0.054ct loose stone (emerald cut)
Sold out 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}
Sold out コロンビア産エメラルド 10.708ct原石

Colombian emerald 10.708ct rough stone
Sold out Ethiopian oil-free emerald 0.32ct loose GIA

Ethiopian oil-free emerald 0.32ct loose GIA

Sold out コロンビア産エメラルド 0.922ct原石

Colombian emerald 0.922ct rough stone (Canutillo)
Sold out エメラルド 3mm/0.126ct ルース

Colombian emerald 3mm/0.126ct loose

Sold out エメラルド 3.1mm/0.117ctルース

Colombian emerald 3.1mm/0.117ct loose

Sold out 【12533497掲載】コロンビア産エメラルドキャッツアイ 0.065ctルース

Colombian emerald cat's eye 0.065ct loose
Sold out コロンビア産エメラルド 2.680ct原石

Colombian emerald 2.680ct rough stone
Sold out コロンビア産エメラルド 0.350ct原石

Colombian emerald 0.350ct rough stone
Sold out コロンビア産エメラルドキャッツアイ 0.079ctルース

Colombian emerald cat's eye 0.079ct loose
Sold out コロンビア産エメラルドキャッツアイ 0.061ctルース

Colombian emerald cat's eye 0.061ct loose
Sold out K18YG コロンビア産エメラルド 0.591ct ペンダント（ネックレス）

K18YG Colombian emerald 0.591ct ruby pendant (necklace)
Sold out コロンビア産ノンオイルエメラルド 0.170ctルース

Colombian Oil-Free Emerald 3.5mm/0.170ct Loose GIA

Sold out ブラジル産アレキサンドライト 0.098ctルース

Brazilian Alexandrite 0.098ct loose stone (emerald cut)
Sold out エメラルド 0.138ctルース

Emerald 0.138ct loose stone

Sold out K18YG コロンビア産エメラルド 0.173ct リング

K18YG Colombian emerald 4.1mm/0.173ct rose cut diamond ring
Sold out コロンビア産パイライト付きエメラルド 40.789ct原石

Colombian pyrite emerald 40.789ct rough stone
Sold out ノンオイルエメラルド 0.564ctルース

Non-Oil Emerald 0.564ct Loose Stone by Nikkei
Sold out コロンビア産エメラルド 1.140ct原石

Colombian emerald 1.140ct rough stone

Sold out コロンビア産パイライト付きエメラルド 1.902ct原石

Colombian emerald with pyrite 1.902ct rough stone
Sold out コロンビア産エメラルド 1.329ct原石

Colombian emerald 1.329ct rough stone
Sold out Colombian emerald 0.625ct rough stone

Colombian emerald 0.625ct rough stone
Sold out コロンビア産ノンオイルエメラルド 0.384ctルース

Colombian oil-free emerald 0.384ct loose Japanese-German edition
Sold out Colombian emerald 0.057ct loose (Mariposa)

Colombian emerald 0.057ct loose (Mariposa)
Sold out ブラジル産エメラルド 3.2mm/0.124ctルース

Brazilian emerald 3.2mm/0.124ct loose

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の取り組みと社会貢献

業界発展のための後進育成や事業協力、宝石の国スリランカの子どもたちへの支援活動など、KARATZの取り組みについてご紹介いたします。

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.