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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
コロンビア産エメラルド 0.150ctルース

Colombian emerald 3.5mm/0.150ct loose stone Sale price¥22,800
ノンオイルエメラルド 1.070ctルース グベリン鑑別書

Non-Oil Emerald 1.070ct Loose Gübelin Certificate Sale price¥698,000
エメラルド 0.484ルース

Emerald 0.484ct loose Sale price¥18,800
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
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 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 Sale price¥348,000
coming soon コロンビア産エメラルド 0.079ctルース

[9/27 10:00 PM Release] Colombian Emerald 0.079ct Loose Stone Sale price¥8,800
coming soon コロンビア産エメラルド 0.121ctルース

[9/27 10:00 PM Release] Colombian Emerald 0.121ct Loose Stone Sale price¥15,800
coming soon コロンビア産エメラルド 0.148ctルース

[9/27 10 PM Sale] Colombian Emerald 0.148ct Loose Stone Sale price¥29,800
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》
coming soon [Deadline: Mon, Sep 28, 10:00 AM: Lottery Sale_08] Russian Emerald 0.280ct Loose Stone (F1) GIA

[Deadline: Mon, Sep 28, 10:00 AM: Lottery Sale_08] Russian Emerald 0.280ct Loose Stone (F1) GIA Sale price¥98,000
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)
coming soon 【12560956掲載】コロンビア産ノンオイルエメラルド 0.290ctルース

[Deadline: Mon, 9/28, 10 AM: Lottery Sale_09] Colombian Non-oil Emerald 0.290ct Loose Stone Sale price¥188,000
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 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
coming soon [Mon, 9/28, 10:00 AM Deadline: Lottery Sale_10] Colombian Pyrite in Emerald 2.905ct Loose Stone

[Mon, 9/28, 10:00 AM Deadline: Lottery Sale_10] Colombian Pyrite in Emerald 2.905ct Loose Stone Sale price¥69,800
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 (In Stock) Lottery Sale 4 [For Winners Only] [Published on 12559711] Colombian Oil-Free Emerald 0.050ct Loose Stone (NONE) GIA

(In Stock) Lottery Sale 4 [For Winners Only] [Published on 12559711] Colombian Oil-Free Emerald 0.050ct Loose Stone (NONE) GIA
Sold out コロンビア産パイライトインエメラルド 4.680ctルース

[Deadline: Thursday, May 14th, 10 am JST] Lottery Sale_0508_10 Colombian Pyrite in Emerald Loose Stone, 4.680ct
Sold out US Benitoite 0.148ct Loose Stone (Emerald Cut) with Gem Identification Report

US Benitoite 0.148ct Loose Stone (Emerald Cut) with Gem Identification Report
Sold out Pt900 コロンビア産ミントカラーエメラルド 4mm/0.22ct ・ダイヤモンド0.16ctペンダントトップ（ネックレストップ）鑑別書

Pt900 Colombia Mint Color Emerald 4mm/0.22ct & Diamond 0.16ct Pendant Top with Certificate

Sold out コロンビア産パイライト・雲母インエメラルド 0.271ctルース 鑑別書

[On sale August 2nd at 10 PM] Colombian pyrite and mica-in-emerald 0.271ct loose stone with gemological report
Sold out コロンビア・コスケス鉱山トラピッチェエメラルド 0.177ctルース 鑑別書

Colombia Cosquez Mine Trapiche Emerald 0.177ct Loose Gemstone with Certification
Sold out コロンビア産エメラルド 1.470ctルース

Colombian Emerald, 1.470 ct, Loose, with Origin Report (Houseki Kyo)

Sold out コロンビア産エメラルド 0.792ctルース

[Sale begins August 5th at 10 PM] Colombian Emerald 0.792ct Loose Stone with Certification
Sold out K18 翡翠（ヒスイ） 1.051ct ペンダントトップ（ネックレストップ）

[Listed 22602671] [Karahuri] K18 Jadeite (Jade) 1.051ct Pendant Top
Sold out ザンビア産エメラルド 1.267ctルース

Zambian Emerald 1.267ct Loose Stone with Certificate
Sold out ザンビア産エメラルド 1.112ctルース 鑑別書

Zambian Emerald 1.112 ct Loose Gemstone with Certificate

Sold out コロンビア産パイライトインエメラルド 4.222ctルース

Colombian Pyrite in Emerald 4.222ct Loose Stone

Sold out コロンビア産エメラルド 0.135ctルース

Loose Colombian emerald, 0.135 ct, Hōki Kyō (Japan Gem Laboratory)
Sold out コロンビア産パイライトインエメラルド 2.107ctルース

Lottery Sale 11 [For Winners Only] [Listing 12562752] Colombian Pyrite in Emerald Loose Stone 2.107ct

Sold out Pt900 エメラルド 0.30ct ・ダイヤモンド0.01ctペンダントトップ（ネックレストップ）

[Karafuru] Pt900 Emerald 0.30ct / Diamond 0.01ct Pendant Top
Sold out "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose cut, or mint green emeralds that normally retail for ¥88,800. 《Bulk purchase discount available》

"Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose cut, or mint green emeralds that normally retail for ¥88,800. 《Bulk purchase discount available》
Sold out コロンビア産パイライトインエメラルド 3.817ctルース

Colombian pyrite emerald 3.817ct loose stone

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 ブラジル産グリーンベリル 0.559ctルース

0.559ct Brazilian Emerald Cat's Eye Loose Stone with Certificate

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.