13x7x4.5mm 2.2 cts Loose faceted Aquamarine cut pear q508

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Beryl (beryllium aluminum silicate) 
Types/Color:

Aquamarine – light blue to blue-green

Bixbite – Red to strawberry-red

Emerald – Green

Goshenite – colorless

Heliodor – deep yellow

Morganite – Pink to peach

Other beryls may be referred to by their color, such as green beryl and yellow beryl.

Mohs hardness: 7.5-8

Refractive index: 1.57-1.6

Critical angle: 39.5°

Specific gravity: 2.65-2.75

Cleavage: None

Fracture: Conchoidal, tough

Dispersion: Medium (.014)

Heat sensitivity: None

Pleochroism: Dichroic – Golden: weak (yellow to light-yellow); Goshenite: colorless, no dichroism; Green: distinct (yellow-green to blue-green); Heliodor: weak (gold-yellow to greenish-yellow); Morganite: distinct (pale-pink to lavender-pink); Purple: distinct (purple to colorless); Yellow: (light yellow to medium yellow).

Birefringence (double refraction): Weak (.006-.009)

Crystal structure: Hexagonal