Natural Black Rutilated Quartz Hexagon Cut – 3.720 ct | Unique Included Quartz Gemstone
This gemstone has several premium characteristics:
✔ Natural Black Rutilated Quartz
✔ Attractive hexagon fantasy cut
✔ Large visible rutile needles creating a dramatic pattern
✔ Good brilliance despite the inclusions
✔ Excellent for custom jewelry or collectors
✔ Weight: 3.720 ct
✔ Symmerty: very good
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
