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alexandrite

Alexandrite is known as one of the birthstones for June. Its main feature is its color-change effect, which means that its color changes depending on the light source. It was once mined in large quantities in Russia, but today its main production area is said to be Brazil. Since it is difficult to find large stones, the larger they are and the more obvious their color-change effect is, the more valuable they are.


Carats Gem Magazine
" alexandrite "

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coming soon 【6/7 22時販売】インド・オリッサ産アレキサンドライト 0.764ctルース 鑑別書

【6/7 22時販売】インド・オリッサ産アレキサンドライト 0.764ctルース 鑑別書 Sale price¥29,800
coming soon 【6/8 22時販売】インド・オリッサ産アレキサンドライト 0.760ctルース 鑑別書

【6/8 22時販売】インド・オリッサ産アレキサンドライト 0.760ctルース 鑑別書 Sale price¥19,800
coming soon 【6/7 22時販売】インド・オリッサ産アレキサンドライト 0.759ctルース 鑑別書

【6/7 22時販売】インド・オリッサ産アレキサンドライト 0.759ctルース 鑑別書 Sale price¥22,800
coming soon 【6/8 22時販売】インド・オリッサ産アレキサンドライト 0.715ctルース 鑑別書

【6/8 22時販売】インド・オリッサ産アレキサンドライト 0.715ctルース 鑑別書 Sale price¥18,800
ブラジル産アレキサンドライト 0.128ctルース

【6/5 22時販売】ブラジル産アレキサンドライト 0.128ctルース Sale price¥29,800
Brazilian alexandrite 0.061ct loose

Brazilian alexandrite 0.061ct loose Sale price¥12,800
Brazilian alexandrite 0.058ct loose

Brazilian alexandrite 0.058ct loose Sale price¥11,000
Brazilian alexandrite 0.051ct loose

Brazilian alexandrite 0.051ct loose Sale price¥9,800
Brazilian alexandrite 0.060ct loose

Brazilian alexandrite 0.060ct loose Sale price¥11,000
合成アレキサンドライト 0.379ctルース

[On sale May 22nd at 10 PM] Synthetic Alexandrite 4.3mm/0.379ct Loose Stone Sale price¥9,800
合成アレキサンドライト 1.355ctルース

[On sale May 15th at 10 PM] Synthetic Alexandrite 1.355ct Loose Stone Sale price¥24,800
合成アレキサンドライト 0.885ctルース

[On Sale May 24, 10 PM JST] Synthetic Alexandrite Loose Stone 0.885ct Sale price¥18,800
合成アレキサンドライト 0.979ctルース

[On sale May 24th, 10 PM JST] Synthetic Alexandrite 5.8mm/0.979ct Loose Stone Sale price¥22,800
合成アレキサンドライト 1.320ctルース

[On sale 5/22 at 10 PM] Synthetic Alexandrite 1.320ct Loose Gemstone Sale price¥19,800
合成アレキサンドライト 1.241ctルース

[On sale May 21st at 10 PM] Synthetic Alexandrite 1.241ct Loose Gemstone Sale price¥25,800
合成アレキサンドライト 0.228ctルース

[On sale May 21st, 10 PM JST] Synthetic Alexandrite 0.228ct Loose Stone Sale price¥9,800
合成アレキサンドライト 0.808ctルース

[On sale 5/21 at 10 PM] Synthetic Alexandrite 0.808ct Loose Stone Sale price¥18,800
合成アレキサンドライト 0.414ctルース

【Sale starts May 17th, 10 PM JST】Synthetic Alexandrite 0.414ct Loose Stone Sale price¥12,800
ブラジル産アレキサンドライト・ムーンストーン2石セット（6月誕生石セット）《複数購入割引有》

《Limited to 32 stones》 Brazilian Alexandrite Moonstone 2 stone set (June birthstone set)《Multiple purchase discount available》 Sale price¥3,980
Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available

Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available Sale price¥9,800
[Available at 10 PM on February 15th] [Limited to 150 stones - New in Tucson] Brazilian Alexandrite Loose Stone (Top Quality, Melee Size, Hemachita Mine) [Multiple Purchase Discounts Available]

[Available at 10 PM on February 15th] [Limited to 150 stones - New in Tucson] Brazilian Alexandrite Loose Stone (Top Quality, Melee Size, Hemachita Mine) [Multiple Purchase Discounts Available] Sale price¥3,980
[Sales Start: May 5th, 10 PM JST] Limited 12 Stones - Alexandrite Gacha with Alexandrites from Different Origins, including Russian Alexandrite (normally 69,800 JPY), plus a bonus Sri Lankan Chrysoberyl crystal. Multiple purchase discount available.

[Sales Start: May 5th, 10 PM JST] Limited 12 Stones - Alexandrite Gacha with Alexandrites from Different Origins, including Russian Alexandrite (normally 69,800 JPY), plus a bonus Sri Lankan Chrysoberyl crystal. Multiple purchase discount available. Sale price¥6,980
Limited to 15 stones: Brazilian Silky Alexandrite Loose Stone (2.5-3.0mm, Round Cut) - Multiple Purchase Discounts Available

Limited to 15 stones: Brazilian Silky Alexandrite Loose Stone (2.5-3.0mm, Round Cut) - Multiple Purchase Discounts Available Sale price¥7,980
Limited to 8 stones: 1 loose synthetic alexandrite (custom cut by Mr. Sanjay, shield cut, octagonal cut, etc.) Discounts available for multiple purchases

Limited to 8 stones: 1 loose synthetic alexandrite (custom cut by Mr. Sanjay, shield cut, octagonal cut, etc.) Discounts available for multiple purchases Sale price¥6,980
Limited to 8 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.2mm/average 0.12ct) Multiple purchase discounts available

Limited to 8 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.2mm/average 0.12ct) Multiple purchase discounts available Sale price¥11,000
Russian Alexandrite 2.5mm/0.078ct Loose Stone

Russian Alexandrite 2.5mm/0.078ct Loose Stone Sale price¥49,800
Brazilian Alexandrite 2.7mm/0.105ct Loose Stone

Brazilian Alexandrite 2.7mm/0.105ct Loose Stone Sale price¥29,800
Brazilian alexandrite 0.070ct loose

Brazilian alexandrite 0.070ct loose Sale price¥39,800
Synthetic Alexandrite 4.3mm/0.430ct Loose Stone

Synthetic Alexandrite 4.3mm/0.430ct Loose Stone Sale price¥12,800
Synthetic Alexandrite 0.338ct loose stone

Synthetic Alexandrite 0.338ct loose stone Sale price¥12,800
Russian Alexandrite 0.091ct Loose Stone

Russian Alexandrite 0.091ct Loose Stone Sale price¥69,800
Alexandrite cat's eye from Sri Lanka 0.947ct loose

Alexandrite cat's eye from Sri Lanka 0.947ct loose Sale price¥18,800
ロシア産アレキサンドライト 0.167ctルース

0.167ct loose alexandrite from Russia Sale price¥98,000
ロシア産アレキサンドライト 0.083ctルース

Russian Alexandrite 0.083ct loose stone Sale price¥69,800
ロシア産アレキサンドライト 0.049ctルース

Russian Alexandrite 0.049ct loose stone Sale price¥49,800
ロシア産アレキサンドライト 2/5mm/0.070ctルース

Russian Alexandrite 2/5mm/0.070ct Loose Stone Sale price¥59,800
K18PGカナリーイエローダイヤモンド（トリートメント）0.214ct・アレキサンドライトリング 中宝付

18KPG Canary Yellow Diamond (Treatment) 0.214ct (SI-1, Fancy Intense Greenish Yellow) and Alexandrite Ring Sale price¥128,000
ブラジル産アレキサンドライト 0.097ctルース

Brazilian Alexandrite 0.097ct Loose Stone (Emerald Cut) Sale price¥38,800
ブラジル産アレキサンドライト 0.099ctルース（ヘマチタ鉱山）

Brazilian Alexandrite 0.099ct Ruth (Hemachita Mine) Sale price¥19,800
ブラジル産アレキサンドライト 0.060ctルース

Brazilian alexandrite 0.060ct loose Sale price¥14,800
ブラジル産アレキサンドライト 0.058ctルース

[12554117] Brazilian Alexandrite 0.058ct loose stone Sale price¥14,800
合成アレキサンドライト 0.827ctルース

Synthetic Alexandrite 5.7mm/0.827ct Loose Stone Sale price¥19,800
ブラジル産アレキサンドライト 0.102ctルース《6月誕生石》

Brazilian alexandrite 0.102ct loose Sale price¥15,800
ブラジル産アレキサンドライト 0.091ctルース

Brazilian alexandrite 0.091ct loose Sale price¥15,800
ブラジル産アレキサンドライト 0.151ctルース

Brazilian alexandrite 0.151ct loose Sale price¥25,800
合成アレキサンドライト 0.460ctルース

Synthetic Alexandrite 0.460ct loose stone Sale price¥14,800
合成アレキサンドライト 0.560ctルース

Synthetic Alexandrite 0.560ct loose stone Sale price¥14,800
合成アレキサンドライト 0.570ctルース

Synthetic Alexandrite 0.570ct loose stone Sale price¥18,800

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.