24 March 2019

MAY BIRTHSTONES – EMERALD is the bluish green to green variety of beryl, a mineral species that includes aquamarine. Gem experts differ on the degree of green that makes one stone an emerald and another stone a less-expensive green beryl. Most gemologists, gemological laboratories, and colored stone dealers call a stone green beryl when its color is “too light” for it to be classified as emerald. Even among that group, however, there’s a difference of opinion about what’s considered “too light.”
Mineral: Beryl;
Chemistry: Be3Al2Si6O183;
Color: Vibrant green;
Refractive index: 1.577 to 1.583;
Birefringence: 0.005 to 0.009;
Specific gravity: 2.72;
Mohs harness: 7.5 to 8;
COLOR: The most desirable emerald colors are bluish green to pure green, with vivid color saturation;
CLARITY: In Emerald expect to see inclusions that dealers like to call an internal “jardin,” or garden;
CUT: Due to the crystal shape emeralds are commonly cut as rectangular step cuts called emerald cuts;
CARAT WEIGHT: Because its density is lower, a one-carat emerald will appear larger in size than a one-carat diamond~24