Green beryls are called emerald, blue aquamarine. Green emerald
expresses faithfullness and continuity. The coloring agent is
chrome, sometimes vanadium. The color is very stable against light
and heat. The color distribution is often irregular; a dark green is
most desired. Only the fine specimens are transparent. Often the
emerald is clouded by inclusions. These are not classified as faults,
but as evidence to the genuineness of the emerald as compared with synthetices.
Physical Properties: Emerald
Color: Emerald Green, green and yellowish green; Emeralds
Moh's Hardness: 7.5-8; Emeralds Density:
2.67-2.78; Emerald Chemical Composition:
Aluminium Berrylium Silicate; Emeralds Transparency:
Transparent to Opaque; Emeralds Refractive Index: 1.565-1.602;
Emeralds Dispersion: 0.014; Emeralds
Pleochroism: Definite; green, blue, blue green to yellow green.