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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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Sold out Synthetic alexandrite 1 stone (round, mele size)《Discount available for multiple purchases》
Sold out Top Quality: Brazilian Alexandrite 1 Stone Loose (2.0mm, Hematita Mine) Multiple Purchase Discounts Available
Sold out 1 Russian Alexandrite loose stone (round cut, 1.3-1.6mm) {Multiple purchase discount available}
Sold out Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available
Sold out Limited to 5 stones: 1 Brazilian Alexandrite loose stone (round cut, 1.3mm) Multiple purchase discounts available
Sold out ブラジル産アレキサンドライト 0.058ctルース
Sold out ロシア産アレキサンドライト 0.333ctルース
Sold out Brazilian alexandrite 0.066ct loose (Hemachita mine)
Sold out ブラジル産アレキサンドライト 0.044ctルース
Sold out Pt950ブラジル産アレキサンドライト0.301ct・ダイヤモンドリング
Sold out ロシア産アレキサンドライト 0.046ctルース
Sold out 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)
Sold out 合成アレキサンドライト 0.561ctルース
Sold out 合成アレキサンドライト 0.514ctルース
Sold out 合成アレキサンドライト 0.445ctルース
Sold out 合成アレキサンドライト 0.411ctルース
Sold out ブラジル産アレキサンドライトキャッツアイ 0.223ctルース
Sold out ブラジル産アレキサンドライトキャッツアイ 0.219ctルース
Sold out インド産アレキサンドライトキャッツアイ 0.787ctルース
Sold out ブラジル産アレキサンドライト 0.125ctルース
Sold out 合成アレキサンドライト 0.405ctルース
Sold out ブラジル産アレキサンドライト 0.134ctルース
Sold out ブラジル産アレキサンドライト 0.280ctルース(ヘマチタ鉱山)
Sold out ロシア産アレキサンドライト 0.163ctルース
Sold out ブラジル産アレキサンドライト 0.35ctルース(ヘマチタ鉱山) GIA
Sold out ブラジル産アレキサンドライト 0.055ctルース(ヘマチタ鉱山)
Sold out ブラジル産アレキサンドライト 0.560ctルース

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.