GRENADES with the alexandrite effect

GRENADES with the alexandrite effect
3,51х1,98 mm
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Among the variety of garnets are very rare species - garnets with the alexandrite effect. What is the alexandrite effect? This is a manifestation of different colors depending on the light source. Usually with the electric light, these stones are red, and daylight - green, blue, brown, yellow. The color change is due to admixture of vanadium. Mostly mined in Africa and Madagascar, but they occur in Russia. For example, a small grenade found in Yakutia.