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emerald

Emerald is the birthstone of May. It is a type of beryl, the same mineral as aquamarine, and is a green gemstone. It is also known as the stone that Cleopatra once loved, and many anecdotes remain. It is characterized by its brittle nature with many scratches and inclusions, so much so that there is a saying that ``There are fewer emeralds without scratches than people with no defects.''

Karatz GemMagazine
" Emerald "

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coming soon [Use the #202509 Campaign] 2025 New Year's Lucky Bag 🎍 Gem Gacha Lucky Bag with 4 or more gemstones (worth ¥25,000) [Discount for bulk purchase of lucky bags]

[Use the #202509 Campaign] 2025 New Year's Lucky Bag 🎍 Gem Gacha Lucky Bag with 4 or more gemstones (worth ¥25,000) [Discount for bulk purchase of lucky bags] Sale price¥15,000
コロンビア産パイライト・雲母インエメラルド 1.192ctルース 鑑別書

[Sale starts 10 PM JST 7/31] Colombian Pyrite and Mica in Emerald Loose Stone, 1.192ct, with Certificate Sale price¥79,800
[Item 12563910] Colombian Pyrite and Mica in Emerald, 0.360 ct Loose Stone

[Item 12563910] Colombian Pyrite and Mica in Emerald, 0.360 ct Loose Stone Sale price¥29,800
コロンビア産トラピッチェエメラルド 0.252ctルース

[Posted as 12563944] Colombian Trapiche Emerald 0.252ct Loose Stone Sale price¥35,800
コロンビア産トラピッチェエメラルド 0.231ctルース

[Listed as 12563943] Colombian Trapiche Emerald 0.231ct Loose Gemstone Sale price¥33,800
コロンビア産エメラルド 0.107ctルース

[Listed as 12563997] 0.107ct Colombian Emerald Loose Stone Sale price¥12,800
コロンビア産トラピッチェエメラルド 0.184ctルース

[On sale July 28th at 10 PM] Colombia Cosquez Trapiche Emerald 0.184ct Loose, with identification certificate Sale price¥25,800
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

[On Sale 7/25 at 10 PM JST] Colombia Cosquez Mine Trapiche Emerald 0.177ct Loose Stone with Certificate Sale price¥29,800
コロンビア産トラピッチェエメラルド 0.157ctルース

[On sale July 28, 10 PM JST] Colombia, Cosquez Trapiche Emerald, 0.157 ct Loose Stone with Certificate Sale price¥22,800
コロンビア・コスケス鉱山トラピッチェエメラルド 0.144ctルース 鑑別書

[Sale starts July 25th at 10 PM] Colombian Cosquez Mine Trapiche Emerald 0.144ct Loose Stone with Certification Sale price¥22,800
コロンビア・コスケス鉱山トラピッチェエメラルド 0.138ctルース 鑑別書

[Sales Start: July 25th, 10 PM JST] Colombia Cosquez Mine Trapiche Emerald 0.138ct Loose Stone with Certification Sale price¥19,800
コロンビア産エメラルド 0.286ctルース

[Available 7/28 10 PM JST] Colombian Emerald, 4.5mm/0.286ct Loose Gemstone, Hoki-kyo Sale price¥69,800
コロンビア産エメラルドキャッツアイ 0.060ctルース

【7/29 10 PM Sale】Colombian Emerald Cat's Eye 0.060ct Loose Stone (Houseki Kyo Appraisal) Sale price¥15,800
【12563934掲載】コロンビア産エメラルド 0.792ctルース

[Posted on 12563934] Colombian Emerald 0.792ct Loose Stone Sale price¥39,800
コロンビア産バイカラーエメラルド 0.824ctルース

[On sale July 22nd, 10 PM JST] Colombian Bicolor Emerald 0.824ct Loose Gemstone Sale price¥25,800
コロンビア産エメラルド 0.191ctルース

[On sale July 12th, 10 PM JST] Colombian Emerald, 0.191 ct loose stone, Hoki Kyokai Sale price¥45,800
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
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} Sale price¥9,800
Limited to 8 stones: 1 loose kite cut stone (illusion sunstone, sapphire, emerald, spessartine garnet, etc.) Multiple purchase discounts available

Limited to 8 stones: 1 loose kite cut stone (illusion sunstone, sapphire, emerald, spessartine garnet, etc.) Multiple purchase discounts available Sale price¥5,980
[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
エメラルド 15.219ctルース 日独鑑

Natural Emerald from Brazil, 15.219 ct, Loose Stone, Nichidoku Identification Report Sale price¥398,000
コロンビア産エメラルド 0.147ctルース

[On sale July 5th at 10 PM] Colombian Emerald 0.147ct Loose Stone with Appraisal Sale price¥12,800
コロンビア産エメラルド 0.167ctルース

[On sale July 5th at 10 PM] Colombian Emerald 3.3mm/0.167ct Loose Gemstone with Certificate Sale price¥24,800
コロンビア産エメラルド 0.158ctルース

[On Sale July 5th at 10 PM] Colombian Emerald 3.3mm/0.158ct Loose Stone with Appraisal Sale price¥18,800
K18 白蝶真珠（白蝶パール） 鳥モチーフ ペンダントトップ（ネックレストップ） 鑑別書

[Sale on 6/22 at 10 PM] Colorful K18 White South Sea Pearl, 0.17ct Diamond, Ruby, Sapphire, Emerald Bird Motif Pendant Top (Necklace Top) with Appraisal Report 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¥8,800
コロンビア産トラピッチェエメラルド 0.183ctルース

[On sale June 19, 10 PM] Colombian Trapiche Emerald 0.183ct Loose Stone Sale price¥39,800
コロンビア産トラピッチェエメラルド 0.210ctルース

[On sale June 23rd, 10 PM JST] Colombian Trapiche Emerald 0.210ct Loose Stone Sale price¥39,800
コロンビア産ノンオイルエメラルド 0.210ctルース

[#202607AkihabaraPopUpOnLoan] [Sale 6/7 10PM JST] Colombian Non-Oil Emerald 0.210ct Loose GIA Sale price¥228,000
コロンビア産トラピッチェエメラルド 1.875ctルース

[On sale June 7th at 10 PM] Colombian Trapiche Emerald, 1.874ct Loose Stone, with Identification Report Sale price¥69,800
コロンビア産パイライトインエメラルド 4.221ctルース

[Sale on June 6 at 10 PM] Pyrite in Emerald from Chivor Mine, Colombia, 4.221 ct Loose Stone Sale price¥98,000
コロンビア産トラピッチェエメラルド 0.418ct原石

Colombian Trapiche emerald 0.418ct rough stone Sale price¥39,800
コロンビア産エメラルド 0.145ctルース

Colombian emerald 0.145ct loose stone with precious stone Sale price¥29,800
コロンビア産エメラルド 0.512ctルース

Colombian emerald 0.512ct loose stone (silky type) Sale price¥12,800
ブラジル産グリーンベリル 0.559ctルース

[For sale on May 16th at 10 PM] Brazilian Emerald Cat's Eye 0.559ct Loose Stone with Appraisal Report Sale price¥9,800
ブラジル産エメラルドキャッツアイ0.459ctルース

[On Sale May 16th, 10 PM JST] Brazilian Emerald Cat's Eye 0.459 ct Loose Gemstone with Certificate Sale price¥9,800
ブラジル産グリーンベリル 1.022ctルース

[On Sale May 16th, 10 PM JST] Brazilian Emerald Cat's Eye 1.022ct Loose Stone with Certification Sale price¥12,800
コロンビア産トラピッチェエメラルド 0.611ct原石

Colombian Trapiche emerald 0.611ct rough stone Sale price¥59,800
ノンオイルエメラルド 1.370ctルース

Non-Oil Emerald 1.370ct Loose GIA Sale price¥1,580,000
コロンビア産ノンオイルエメラルド 0.310ctルース

Colombian oil-free emerald 0.310ct loose stone Sale price¥298,000
[On sale 5/4 at 10 PM] Colombian bicolor emerald 0.274ct loose stone

[On sale 5/4 at 10 PM] Colombian bicolor emerald 0.274ct loose stone Sale price¥98,000
コロンビア産ミントカラーエメラルド 0.136ctルース

Colombian mint color emerald 0.136ct loose stone Sale price¥6,980
コロンビア産ミントカラーエメラルド 0.155ctルース

Colombian mint color emerald 0.155ct loose stone Sale price¥7,980
Colombian Trapiche Emerald 0.422ct Loose

Colombian Trapiche Emerald 0.422ct Loose Sale price¥18,800
Colombian emerald 0.499ct rough stone

Colombian emerald 0.499ct rough stone Sale price¥14,800
Colombian emerald 0.443ct rough stone

Colombian emerald 0.443ct rough stone Sale price¥8,800
コロンビア産エメラルドキャッツアイ 0.689ctルース

[On Sale May 14th at 10 PM] Colombian Emerald 0.689ct Loose Stone Sale price¥18,800
コロンビア産エメラルド 0.345ctルース

Colombian emerald 0.345ct loose stone (silky type) Sale price¥15,800

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.