FA-TOPAO24SB-002-143

Natural Gems Belgium Colored Stone Certification FA-TOPAO24SB-002-143

IDENTIFICATION : Natural Swiss Blue Topaz - 19.978 ct -oval - irradiated - certified natural

Species : Natural Topaz
Variety :  blue topaz

DESCRIPTION

Shape & Cutting Style : Oval , Mixed Cut
Measurements : 17.8 x 13.0 x 10. mm
Carat Weight : 19.978 carat
Color :  blue (swiss blue)
Clarity : comparable to SI1
Transparency : Transparent
Binefringence: 0.008-0.011
Crystallography : Orthorhombic
Hardness : 8
Luster : Vitreous
Refractive Index : 1.607-1.649 (1631=Brazil)
Specific Gravity : 3.50-3.57 ( 352-353)

COMMENTS

Color iproved by irradiation
tiny chips on girdle not influencing clarity or value

Personal Note From Natural Gems Belgium:

This blue topaz has good to very good cut grade, good to very good polish, good  color, and good symmetry, ct weight is good to very good, the clarity is good to very good.
even there are 2 tiny chips on the girdle, they do not affect clarity level