Natural Black Rutilated Quartz – Hexagon Faceted – 3.915 ct – 9.9 × 9.9 × 6.2 mm
This gemstone has several premium characteristics:
✔ Natural Black Rutilated Quartz
✔ Attractive hexagon fantasy cut
✔ Large and clear visible rutile needles
✔ Good transparancy despite the inclusions
✔ Excellent for custom jewelry or collectors
✔ Weight: 3.915 ct
✔ Symmetry: good
Certificate : FA-QUAR026RB-003-501 Gem Type: Natural Clear Quartz Weight: 3.915 Carat Shape: hexagon, mixed cut Size: 9.8 x 9.9 x 9.9 x 6.2 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
