FA-CROP024BL-002-010

Natural Gems Belgium Colored Stone Certification : FA-CROP024BL-002-010

IDENTIFICATION : Natural Black Crystal Opal - play of color - 1.892 ct - oval - smoked

Species : Natural Opal
Variety : Black Crystal Opal

DESCRIPTION

Shape & Cutting Style : Oval , mixed cut
Measurements : 12.2 x 8.2 x 5.2 mm
Carat Weight : 1.892 Carat
Color : Black with rainbow play of color opaliscence
Transparency : Transparent
Origin: Ethiopia

Birefringence : none
Crystallography : Amorphous
Dispersion : Very low
Luster : Iridescent
Hardness : 6-6.5
Refractive index : 1.37-1.47
Specific gravity : 2.10

COMMENTS :

Optical Effect : Opaliscence ( White-Red-Orange-Green-Yellow-Violet-Blue )

color enhanced by smoking

Personal Note From Natural Gems Belgium:

• cut grade : good
• color : activation of play of color needs direct sunlight or flashlight
• symmetry : fair
• polish : good
• carat weight : fair