CA-MOON024LB-002-135

Natural Gems Belgium Certification : CA-MOON024LB-002-135

IDENTIFICATION : Natural Moonstone - lightblue and purplish blue adularescence - 3.704 ct - marquise cabochon

Species : Natural Orthoclase (Anorthoclase)
Variety : blue Moonstone

DESCRIPTION:

Shape & Cutting Style : Marquise cabochon, polished both sides
Carat Weight :  3.704 Carat
Measurements : 16.1 x 6.3 x 5.0 mm
Color : clear and milky white with light blue and purplish blue adularescence 
Transparency : Transparant
Hardness : 6.0
Birefringence : 005–0.006
Crystallography : monoclinic
Luster : Opalescent - Vitreous
Refractive index : 1.520-1.525
Specific Gravity : 2.56-2.59

COMMENTS :

No indications of heating, no indications of any other treatment
Inequalities in flat surface
Adularescence is caused by the diffraction of light as it hits thin, alternating layers of orthoclase and albite within the gem. This produces the appearance of a floating, cloud-like, blue to white light inside the gem. A blue sheen is produced if the albite crystals are very fine. 

Personal Note From Natural Gems Belgium:

This clear and milky white with light blue and purplish blue adularescence moonstone is all natural, and it's cut grade is fair to good, symmetry is fair, polish is fair , luster is  good.