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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 1.494ctルース

Colombian Trapiche Emerald 1.494ct Loose Sale price¥69,800
ノンオイルエメラルド 1.030ctルース グベリン グベリン（Gübelin）鑑別書

Non-Oil Emerald 1.030ct Loose Gübelin Gübelin Certificate Sale price¥698,000
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
【12551964掲載】コロンビア産エメラルド 1.435ct原石

Colombian emerald 1.435ct rough stone Sale price¥18,800
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
コロンビア産ミントカラーエメラルド 0.297ctルース

Colombian mint color emerald 0.297ct loose stone Sale price¥9,800
ブラジル産エメラルド 3.2mm/0.124ctルース

Brazilian emerald 3.2mm/0.124ct loose Sale price¥25,800
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
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 【12562785掲載】コロンビア産エメラルドキャッツアイ 0.574ctルース

【On sale May 2nd, 10 PM JST】Colombian Emerald Cat's Eye 0.574ct Loose Stone
Sold out コロンビア産エメラルド 4.7mm/0.468ctルース

[On sale 5/5 at 22:00] Colombian Emerald 4.7mm/0.468ct Loose Stone

Sold out [Sale starts 10 PM JST on 5/14] Colombian Emerald 1.571ct Loose Stone Pendant Top

[Sale starts 10 PM JST on 5/14] Colombian Emerald 1.571ct Loose Stone Pendant Top
coming soon 【12562864掲載】コロンビア産トラピッチェエメラルド 4.185ctルース

【Lottery Sale 0531_12】Colombian Trapiche Emerald 4.185ct Loose Stone, Chuo (Central Gem Lab) Sale price¥158,000
Sold out コロンビア産パイライトインエメラルド 2.780ctルース

Lottery Sale 13 [For Winners Only] [Listed on 12562799] Colombian Pyrite in Emerald 2.780ct Loose Rare Stone [Limited to 1] 198,000 yen 12562799

Sold out Loose Columbian Pyrite in Emerald 3.346 ct

Loose Columbian Pyrite in Emerald 3.346 ct

Sold out コロンビア産パイライトインエメラルド 2.503ctルース

2.503 ct Loose Emerald with Pyrite from Colombia

Sold out Colombian mica in emerald 1.314ct loose

Colombian mica in emerald 1.314ct loose
Sold out Colombian No-Oil Emerald 0.120ct Loose Stone GIA

Colombian No-Oil Emerald 0.120ct Loose Stone GIA
Sold out エメラルド 2.498ctルース

[Clover in cut] Emerald 9mm/2.498ct {Collaboration} Loose with patch
Sold out 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
Sold out 《Limited to 20 Stones》Emerald Gacha: Win a 2.2ct Columbia Emerald Koshu-Kiseki Cut (normally 79,800 yen) or an Emerald Cat's Eye! 《Multiple Purchase Discount Available》

《Limited to 20 Stones》Emerald Gacha: Win a 2.2ct Columbia Emerald Koshu-Kiseki Cut (normally 79,800 yen) or an Emerald Cat's Eye! 《Multiple Purchase Discount Available》
Sold out Colombian trapiche emerald (reverse trapiche) 3.0mm/0.107ct rough stone (faceted cut)

Colombian trapiche emerald (reverse trapiche) 3.0mm/0.107ct rough stone (faceted cut)
Sold out 【12561946掲載】ブラジル産エメラルドインクォーツ 2.358ctルース

Brazilian emerald in quartz 2.358ct loose stone
Sold out 【12561945掲載】ブラジル産エメラルドインクォーツ 3.367ctルース

Brazilian emerald in quartz 3.367ct loose stone
Sold out Colombian emerald 10.940ct rough stone

Colombian emerald 10.940ct rough stone
Sold out Emerald Gacha (including Emerald Cat's Eye and special cuts) featuring Russian non-oil emeralds, etc. 💎 (Multiple purchase discount available)

Emerald Gacha (including Emerald Cat's Eye and special cuts) featuring Russian non-oil emeralds, etc. 💎 (Multiple purchase discount available)
Sold out Colombian emerald rough stone 18.900ct (with pyrite)

Colombian emerald rough stone 18.900ct (with pyrite)
Sold out 0.243ct Colombian Emerald Pair Loose Stones

0.243ct Colombian Emerald Pair Loose Stones
coming soon Myanmar orange jade (jade) 0.531ct loose

Myanmar orange jade (jade) 0.531ct loose Sale price¥4,980
Sold out Colombian oil-free emerald 0.17ct loose GIA

Colombian oil-free emerald 0.17ct loose GIA

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 Colombian Trapiche Emerald 2.318ct Loose

Colombian Trapiche Emerald 2.318ct Loose
Sold out Colombian emerald rough stone 13.577ct

Colombian emerald rough stone 13.577ct
Sold out Colombian emerald 8.169ct rough stone

Colombian emerald 8.169ct rough stone
Sold out Colombian emerald rough stone 6.933ct

Colombian emerald rough stone 6.933ct

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.