FA-QUAR026RB-003-500

Certificate : FA-QUAR026RB-003-500
Gem Type: Natural Clear Quartz
Weight: 3.720 Carat
Shape: hexagon, mixed cut
Size: 9.8 x 9.8 x 9.8 x 5.7 mm. (measured on flat sides)
Color:  clear/black
Clarity: Transparent
Luster: submetallic
Treatment: commonly heated to stabilise materials
Optical Phenomenon : rutilated ( black titanium dioxide inclusions trapped during the formation of quartz)

Birefringence : 0.285 to 0.296
System: Tetragonal.
Habit: Prismatic, acicular (needle-like), often elongated parallel to the c-axis.
Crystallography : Hexagonal (tetragonal)
Dispersion : 0.28 (higher then diamond)
Luster : Vitreous
Hardness : 7
Refractive index : the host quartz, typically around 1.544–1.553, while the rutile inclusions themselves have a very high RI (2.616–2.903), 
Specific gravity : 2.651