Alexandrite: Alexandrite is one of the more rare varieties of color changing chrysoberyl that changes color depending on the type of light that hits it. In daylight it generally appears greenish, while it appears red while indoors due to the incandescent lighting. This gem was first discovered in the Ural Mountains of Russia in the 1830s, but has since been found in Sri Lanka, Brazil, and even East Africa. (read full)

Chrysoberyl: Chrysoberyl appears as prismatic, tabular crystals often v-shaped twins forming pseudo-hexagonal crystals. Single crystals are rare. May be colorless, green, yellow, gray or brown. A variety, alexandrite, is red in tungsten light but dark green in daylight. This pronounced color change is highly-prized, and the exact tone of colors is important, the ideal being brilliant green turning to fie (read full)

Unarovite: Uvarovite is a rare, calcium-chromium emerald-green variety of Garnet. Together with grossular (calcium-aluminum) and andradite (calcium-iron), it makes up the series of ugrandite garnets. These three have similar crystal structure and form, but just have different chemical proportions. It occurs in mixed crystals, so there is a partial replacement of some elements by others. It stands out from t (read full)