Natural Golden Rutilated Quartz – 3.855 ct Octagon Cut Loose Gemstone – 11.9 × 7.8 mm
This gemstone has several premium characteristics:
Reasonable transparency
Strong, long and well-defined golden rutile needles
Good face-up appearance
Nice elongated octagon-cut proportions
Excellent collector and custom jewelry potential
Certificate : FA-QUAR026RG-003-505 Gem Type: Natural Clear Quartz Weight: 3.855 Carat Shape: Octagon, mixed cut Size: 11.9 x 7.8 x 5.1 mm. Color: clear/yellow Clarity: Transparent Luster: submetallic Treatment: commonly heated to stabilise materials Optical Phenomenon : rutilated (golden rutile 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
