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Emerald Cabochon

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Original price $40
Current price $35

Mix colors of cabochon Emerald of different sizes and shapes.

Price per carat: 35 $ per carat (5,600 PKR per carat)

Total number of stones in the lot: 18

Total Weight of all the rubelites: 44 carats

Total Price of the whole lot: 1,540 $ (246,000 PKR)

Origin: Afghanistan

Color: Green


18 stones of different sizes, shapes and beautiful colors.

 

You can also buy one stone of your choice for 35 $ per carat (5,600 PKR).

 

 

EMERALD

Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor. Emerald is a cyclosilicate.

Emeralds, like all colored gemstones, are graded using four basic parameters–the four Cs of connoisseurship: color, clarity, cut and carat weight. Normally, in the grading of colored gemstones, color is by far the most important criterion. A fine emerald must possess not only a pure verdant green hue but also a high degree of transparency to be considered a top gemstone. Emeralds occur in hues ranging from yellow-green to blue-green, with the primary hue necessarily being green. Yellow and blue are the normal secondary hues found in emeralds. Only gems that are medium to dark in tone are considered emeralds; light-toned gems are known instead by the species name green beryl. The finest emeralds are approximately 75% tone on a scale where 0% tone is colorless and 100% is opaque black. In addition, a fine emerald will be saturated and have a hue that is bright (vivid). Gray is the normal saturation modifier or mask found in emeralds; a grayish-green hue is a dull-green hue.

 

GENERAL

Category

Beryl variety

Formula

Be3Al2(SiO3)6

Crystal system

Hexagonal (6/m 2/m 2/m) Space group: P6/mсc

Space group

(6/m 2/m 2/m) – dihexagonal dipyramidal

Unit cell

a = 9.21 Å, c = 9.19 Å; Z = 2

IDENTIFICATION

Formula mass

537.50

Color

Green shades to colorless

Crystal habit

Massive to well Crystaline

Cleavage

Imperfect on the [0001]

Fracture

Conchoidal

Mohs scale hardness

7.5–8

Luster

Vitreous

Streak

White

Diaphaneity

Transparent to opaque

Specific gravity

Average 2.76

Optical properties

Uniaxial (−)

Refractive index

nω = 1.564–1.595,
nε = 1.568–1.602

Birefringence

δ = 0.0040–0.0070

Ultraviolet fluorescence

None (some fracture-filling materials used to improve emerald's clarity do fluoresce, but the stone itself does not)