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As a group of precious gemstones Chrysoberyl is known to occur as three distinct varieties namely Chrysoberyl, alexandrite and cymophane. All varieties are chemically identical, being an aluminate of beryllium (Beryllium alluminium oxide – BeAl2O4 ) although distinctly dissimilar in appearance. Bein..

A variety of chrysoberyl with acicular mineral inclusions oriented in relation to the vertical axis of the chrysoberyl crystal structure capable of producing chatoyancy is identified as cymophane. In its structure these innumerable microscopic needle like inclusions create a silky reflection effect...

Blue corundum in all shades are identified as sapphires. Sri Lanka sapphires are universally renowned for their magnificent quality and the large sizes in which these sometimes occur. Every possible shade of blue is represented among sapphires of Sri Lanka, the various shades ranging from the palest..

The term aquamarine is applied to the pale blue, greenish blue and yellowish blue coloured beryl. The colours are mostly pale or light, the dark shades being less abundant. Aquamarine of a flawless deep blue or greenish blue colour is undoubtedly a stone of beauty. The colours of aquamarine are attr..