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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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coming soon 【2/10 22時販売】コロンビア産エメラルド 8.90ct原石

【2/10 22時販売】コロンビア産エメラルド 8.90ct原石 Sale price¥69,800
Sold out [Lottery Sale 0201_14] Colombian Oil-Free Emerald 0.190ct Loose GIA

[Lottery Sale 0201_14] Colombian Oil-Free Emerald 0.190ct Loose GIA

coming soon [Lottery Sale 0201_13] Colombian Oil-Free Emerald 0.170ct Loose GIA

[Lottery Sale 0201_13] Colombian Oil-Free Emerald 0.170ct Loose GIA Sale price¥278,000
coming soon 18K Yellow Gold Colombian Emerald Ring

18K Yellow Gold Colombian Emerald Ring Sale price¥128,000
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） 0.082ct原石

Colombian trapiche emerald (reverse trapiche) 0.082ct rough stone

Sold out Colombian emerald rough stone 11.155ct (with pyrite)

Colombian emerald rough stone 11.155ct (with pyrite)
Sold out Colombian emerald 3.0mm/0.098ct loose stone

Colombian emerald 3.0mm/0.098ct loose stone
Sold out K18YGコロンビア産エメラルド0.062ct・ダイヤモンドリング

18K Yellow Gold Colombian Emerald 3.0mm/0.062ct Diamond Ring
Sold out オーストラリア産エメラルド 0.320ctルース

Australian emerald 0.320ct loose 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） 0.108ctルース

Colombian trapiche emerald (reverse trapiche) 0.108ct loose
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 コロンビア産トラピッチェエメラルド（逆トラピッチェ） 0.188ctルース

Colombian trapiche emerald (reverse trapiche) 0.188ct loose
Sold out コロンビア産エメラルド 0.121ctルース

Colombian emerald 0.121ct loose stone
Sold out コロンビア産エメラルド 3.9mm/0.200ctルース

Colombian emerald 3.9mm/0.200ct loose stone
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 【12551738掲載】翡翠（ヒスイ） 69.859ctルース

[12551738] Jadeite 69.859ct loose stone
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 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)
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

Sold out ザンビア産エメラルド 0.119ctルース

Colombian emerald 0.119ct loose stone
Sold out コロンビア産ミントカラーエメラルド 0.244ctルース

Colombian mint-colored emerald, 4.1mm/0.244ct loose stone
Sold out ブラジル産ミントカラーエメラルド 0.638ctルース

Brazilian mint-colored emerald, 5.5mm/0.638ct loose stone
Sold out ザンビア産エメラルド 0.166ctルース

Zambian emerald 0.166ct loose stone
Sold out ザンビア産エメラルド 0.171ctルース

[12560254] Zambian emerald 0.171ct loose stone
Sold out 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)
Sold out 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
Sold out Limited to 5 stones: Pentagon Cut Gacha (Sphene, Sunstone, Emerald, etc.) 1 loose stone (Multiple purchase discounts available)

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 エメラルド 77.265ct原石

[Posted 12541074] Emerald 77.265ct rough stone
Sold out エメラルド 162.375ct原石

[Posted 12541071] Emerald 162.375ct 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） 0.107ct原石

Colombian trapiche emerald (reverse trapiche) 0.107ct rough stone
Sold out ブラジル産アレキサンドライト 0.044ctルース

Brazilian Alexandrite 0.044ct Loose Stone (Emerald Cut)
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 コロンビア産ノンオイルエメラルド 0.535ctルース

Colombian oil-free emerald 0.535ct loose Japanese-German edition
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 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
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 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
Sold out 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

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.