Weighing 0.490 ct, this oval cabochon exemplifies refined natural beauty—crystalline quartz adorned with fine black rutile inclusions that form a singular, unrepeatable pattern. Its expertly polished dome surface transitions seamlessly between fine jewelry applications and curated mineral displays. A distinguished choice for those who value genuine gemstone character and timeless aesthetic refinement.
Certificate :CA-QUAR026RB-003-094 Gem Type: Natural Clear Quartz Weight: 0.490 Carat Shape: oval Size: 4.1 x 5.9 x 2.4 mm. Color: clear/black Clarity: Transparent Luster: submetallic Treatment: 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.
Symmetry: High symmetry (4/mmm)
Key Features: High refractive index, large birefringence, high dispersion, giving it distinct colors and optical effects.
Formation:Rutile needles grow within or on quartz, often epitaxially, aligning with the quartz's crystal structure to minimize stress.
Patterns:Can form random, parallel, star-shaped (sagenitic), or dense bundles.
Color:Golden, red, silver, black (from rutile), with the quartz usually colorless.
Significance:The interaction of their crystal structures (epitaxy) dictates the beautiful patterns, making it popular for jewelry
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
