Alexandrite is one of the most amazing stones. The main difference between alexandrite and other gemstones lies in its unique ability to change color depending on ambient light. Alexandrite has a bluish-green or grass-green color when white fluorescent artificial lighting is used, but turns violet or ruby-red in sunlight or candlelight. This is called the alexandrite effect phenomenon, and is commonly used with other minerals that are able to change color. For example, garnets, which can change color, are also called garnets with alexandrite effect.

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Alexandrite is a variety of the mineral chrysoberyl. The unusual color change effect is due to the presence of chromium ions in the crystal lattice. Currently, natural alexandrite is recognized as one of the most beautiful and rare gems. Of course, this led to the appearance of forgeries in the market, which only remotely resemble the original stone as they fail to reflect the great color changing effect and light play inside natural alexandrite. Corundum forgeries are very widespread.

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RG Crystals developed a high level of modern chemical technology to grow crystals with Czochralski Method. This process achieved excellent results and allowed the growth of alexandrite, not the corundum forgery.