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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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[On Sale 10/3 at 10 PM] [Limited to 15 stones] Brazilian Silky Alexandrite Loose Stone (2.5-3.0mm, Round Cut) [Multiple Purchase Discounts Available]

[On Sale 10/3 at 10 PM] [Limited to 15 stones] Brazilian Silky Alexandrite Loose Stone (2.5-3.0mm, Round Cut) [Multiple Purchase Discounts Available] Sale price¥7,980
coming soon [12560900] Russian Alexandrite 0.088ct Loose Stone

[12560900] Russian Alexandrite 0.088ct Loose Stone Sale price¥59,800
coming soon [12560899] Russian Alexandrite 0.058ct Loose Stone

[12560899] Russian Alexandrite 0.058ct Loose Stone Sale price¥49,800
[On Sale at 10pm on October 5th] Russian Alexandrite 0.333ct Loose Stone

[On Sale at 10pm on October 5th] Russian Alexandrite 0.333ct Loose Stone Sale price¥79,800
Brazilian Alexandrite 0.073ct Ruth (Hemachita Mine)

Brazilian Alexandrite 0.073ct Ruth (Hemachita Mine) Sale price¥12,800
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 0.097ctルース（ヘマチタ鉱山）

Brazilian Alexandrite 0.097ct Ruth (Hemachita Mine) Sale price¥22,800
ブラジル産アレキサンドライト 0.098ctルース（ヘマチタ鉱山）

Brazilian Alexandrite 0.098ct Ruth (Hemachita Mine) Sale price¥22,800
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 0.082ctルース

Brazilian alexandrite 0.082ct loose Sale price¥15,800
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

[September 20th, 10 PM Sale] 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・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
Brazilian alexandrite (average 0.12ct) loose (multiple purchase discount available)

Brazilian alexandrite (average 0.12ct) loose (multiple purchase discount available) Sale price¥19,800
Top Quality: Brazilian Alexandrite 1 Stone Loose (2.2mm, Hematita Mine) Multiple Purchase Discounts Available

Top Quality: Brazilian Alexandrite 1 Stone Loose (2.2mm, Hematita Mine) Multiple Purchase Discounts Available Sale price¥11,000
Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available

Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available Sale price¥12,800
Limited to 12 stones: 1 Brazilian Alexandrite loose stone (round cut, 1.0mm) Multiple purchase discounts available

Limited to 12 stones: 1 Brazilian Alexandrite loose stone (round cut, 1.0mm) Multiple purchase discounts available Sale price¥4,980
Limited to 9 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3mm/average 0.105ct) Multiple purchase discounts available

Limited to 9 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3mm/average 0.105ct) Multiple purchase discounts available Sale price¥9,800
合成アレキサンドライト 1.538ctルース

[Sold at 10 PM on September 18th] Synthetic Alexandrite 1.538ct Loose Stone Sale price¥29,800
アレキサンドライト 0.326ctルース

[On sale at 10pm on September 6th] Brazilian Alexandrite 0.326ct Loose Stone Sale price¥79,800
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
アレキサンドライト 0.138ctルース

[Posted 12532932] Alexandrite 0.138ct loose Sale price¥18,800
アレキサンドライト 0.272ctルース

[On sale at 10pm on August 14th] Alexandrite 0.272ct loose stone Sale price¥59,800
合成アレキサンドライト 1.552ctルース

[25.06CP] Synthetic Alexandrite 1.552ct Loose Stone Sale price¥18,800
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
ロシア産アレキサンドライト 0.065ctルース

Russian Alexandrite 0.065ct loose stone Sale price¥59,800
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 Sale price¥18,800
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
ブラジル産アレキサンドライト 0.082ctルース

Brazilian alexandrite 0.082ct loose Sale price¥12,800
ロシア産アレキサンドライト 0.093ctルース

Russian alexandrite 0.093ct loose Sale price¥39,800
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¥29,800
ブラジル産アレキサンドライト 0.091ctルース

Brazilian Alexandrite 0.091ct loose stone (princess cut) Sale price¥22,800
Pt950 ブラジル産アレキサンドライト 0.144ct リング

Pt950 Brazilian Alexandrite 0.144ct Ring Sale price¥79,800
ブラジル産アレキサンドライト 0.056ctルース

Brazilian Alexandrite 0.056ct loose stone Sale price¥22,800
ブラジル産アレキサンドライト 0.054ctルース

[Available at 10 PM on August 17th] Brazilian Alexandrite 0.054ct Loose Stone (Emerald Cut) Sale price¥18,800
ブラジル産アレキサンドライト 0.095ctルース

0.095ct Brazilian Alexandrite Loose Stone (Emerald Cut) Sale price¥35,800
coming soon [12558729] Brazilian Alexandrite 0.079ct loose stone

[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 0.078ctルース

Brazilian alexandrite 0.078ct loose Sale price¥29,800
ブラジル産アレキサンドライト 0.071ctルース

Brazilian Alexandrite 0.071ct loose stone (emerald cut) Sale price¥29,800
インド産アレキサンドライトキャッツアイ 0.643ctルース

Indian Alexandrite Cat's Eye 0.643ct Loose Stone Sale price¥18,800
ブラジル産アレキサンドライト 0.147ctルース（プリンセスカット）

Brazilian Alexandrite 0.147ct loose stone (princess cut) Sale price¥29,800
ブラジル産アレキサンドライト 2.8mm/0.100ctルース

Brazilian Alexandrite 2.8mm/0.100ct Loose Stone Sale price¥19,800
ブラジル産アレキサンドライト 0.052ctルース

Brazilian Alexandrite 0.052ct loose stone Sale price¥9,800
ブラジル産アレキサンドライト 0.145ctルース

Brazilian alexandrite 0.145ct loose Sale price¥35,800

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.