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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
ロシア産ノンオイルエメラルド 0.570ctルース

Russian oil-free emerald 0.570ct loose stone GIA Sale price¥298,000
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
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
コロンビア産エメラルド 0.203ctルース

Colombian emerald 0.203ct loose stone with certificate Sale price¥98,000
コロンビア産雲母インエメラルド 1.940ctルース

Colombian mica in emerald 1.940ct loose Sale price¥49,800
ブラジル産アレキサンドライト 0.054ctルース

Brazilian Alexandrite 0.054ct Loose (Emerald Cut) Sale price¥18,800
ブラジル産アレキサンドライト 0.079ctルース（エメラルドカット）

[12558729] Brazilian Alexandrite 0.079ct loose stone Sale price¥31,800
ブラジル産アレキサンドライト 0.071ctルース

Brazilian Alexandrite 0.071ct Loose (Emerald Cut) Sale price¥29,800
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
ザンビア産エメラルド 0.215ctルース

Zambian Emerald 3.7mm/0.215ct Loose (Silky Emerald) 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 [Sale 6/] 10:00 PM - Limited 11 Stones - Sri Lankan Pink Sapphire (Emerald Cut) Average 0.73ct (Multiple Purchase Discount Available)

[Sale 6/] 10:00 PM - Limited 11 Stones - Sri Lankan Pink Sapphire (Emerald Cut) Average 0.73ct (Multiple Purchase Discount Available) Sale price¥2,980
Sold out K18 ルビー 0.75ct ガーネット,サファイア,アメジスト,エメラルド,トパーズ,ダイヤモンドペンダントトップ（ネックレストップ）鑑別書

K18 ルビー 0.75ct ガーネット,サファイア,アメジスト,エメラルド,トパーズ,ダイヤモンドペンダントトップ（ネックレストップ）鑑別書

Sold out コロンビア産パイライトインエメラルド 0.332ctルース

[Item 12564390] Pyrite in Emerald, 0.332ct loose stone from Colombia
Sold out K18 コロンビア産エメラルド 0.17 0.18ct ダイヤモンド　D0.09ct D0.09ctピアス鑑別書

[Item No. 22602833] K18 Colombian Emerald 0.17ct/0.18ct & Diamond 0.09ct/0.09ct Earrings (with Appraisal Report)

Sold out ブラジル産エメラルドキャッツアイ 0.515ctルース

[Item 12564305] Brazilian Emerald Cat's Eye 0.515ct Loose Stone

Sold out ロシア産ノンオイルエメラルド 0.096ctルース

[Available 10/9 at 10 PM] Russian non-oil emerald loose stone 0.096ct

Sold out コロンビア産パイライト・雲母インエメラルド 0.268ctルース 鑑別書

【Item 12564389】 Colombian Emerald with Pyrite and Mica Inclusions, 0.268ct Loose Gemstone
Sold out コロンビア産ノンオイルエメラルドキャッツアイ 0.170ctルース

[Available 10/3, 10 PM] Colombian Non-Oiled Emerald Cat's Eye 0.170ct Loose Stone GIA

Sold out コロンビア産雲母インエメラルド 0.140ctルース

【10/3 22:00 Release】 Colombian Mica-in-Emerald 0.140ct Loose Stone with Identification Report

Sold out コロンビア産ノンオイルエメラルド 5.3mm/0.600ctルース GIA

[Deadline: Sat, Sep 5, 10:00 AM: Lottery Sale_05] Colombian Non-Oiled Emerald 5.3mm/0.600ct Loose Stone GIA
Sold out Pink Diamond Loot Box💎 Fancy Orange Pink 0.188ct and other Fancy-colored pink diamonds (all stones sorted or certified) 《Multiple purchase discounts available》

Pink Diamond Loot Box💎 Fancy Orange Pink 0.188ct and other Fancy-colored pink diamonds (all stones sorted or certified) 《Multiple purchase discounts available》
Sold out ロシア産エメラルド 0.280ctルース

Russian Emerald 0.280ct Loose Stone (F1) GIA

Sold out Pt900 エメラルド 0.47ct ダイヤモンド0.13ctペンダントトップ（ネックレストップ）鑑別書

[Available 9/18 at 10 PM] [Colori] Pt900 Emerald 0.47ct & Diamond 0.13ct Pendant Top (Necklace Top) with Appraisal Report
Sold out Pt900 タンザナイト0.99ct・ダイヤモンド・エメラルド ペンダントトップ鑑別書

[Available 9/18 at 10 PM] [Coloriful] Pt900 Tanzanite 0.99ct, Diamond, & Emerald Pendant Top (Includes Appraisal Report)
Sold out コロンビア産エメラルド 0.070ctルース

【Available 9/21 at 10 PM】 Colombian Emerald 0.070ct Loose Stone
Sold out ザンビア産エメラルド 0.199ctルース

【Available 9/21, 10 PM】 Zambian Emerald 0.199ct Loose Gemstone
Sold out 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
Sold out コロンビア産パイライトインエメラルド 2.905ctルース

Pyrite in Emerald from Colombia, 2.905ct loose stone

Sold out コロンビア産トラピッチェエメラルド 1.591ctルース

[Lottery Sale 0731_05] Colombian Trapiche Emerald 1.591ct Loose Gemstone with Japanese and German Gemological Certificates
Sold out [Sales start 9/5 at 10 PM] 《Limited 5 stones》 Raw Colombian Emerald (avg. 0.52ct) 《Multi-buy discount available》

[Sales start 9/5 at 10 PM] 《Limited 5 stones》 Raw Colombian Emerald (avg. 0.52ct) 《Multi-buy discount available》
Sold out K18WG ブルーサファイア パライバトルマリン、アクアマリン、エメラルド、アイスブルーダイヤモンド(トリートメント)、ブルーサファイア、イエローサファイア、アパタイト、ペリドット、タンザナイト、ブルートパーズリング鑑別書

[Available 9/9 at 10 PM] [Colori] K18WG Blue Sapphire, Paraiba Tourmaline, Aquamarine, Emerald, Ice Blue Diamond, Yellow Sapphire, Apatite, Peridot, Tanzanite, Blue Topaz Ring with Appraisal Certificate
Sold out コロンビア産ノンオイルエメラルド 0.080ctルース

[Lottery Sale 0825_09] Colombian Non-Oil Emerald 0.080ct Loose GIA
Sold out [6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》

[6/ 10 PM JST Release] 《Limited to 11 Stones》Bicolor Gemstone Gacha featuring Paraiba Tourmaline and Euclase 《Bulk Purchase Discount Available》

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.