Natural Red Ruby - 18.987 ct - rough ruby - untreated - Africa

Natural Red Ruby - 18.987 ct - rough ruby - untreated - Africa

Certificate: RO-RUBR025RE-003-003

Gem Type: Corundum - Ruby

Weight: 18.987 Carat

Shape: Rough

Size: 19.99 x 11.5 x 8.2 mm.

Color: Red 

Clarity: Opaque

Luster: N/A

Treatment: untreated

Birefringence : 0.008-0.009
Luster : Vitreous
Hardness : 9
Inclusions : included but avoidable in cutting
Refractive index : 1.757-1.779
Specific gravity : 3.99-4.1
Dispersion : 0.018

COMMENTS :

No indications of heating or any other treatment

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