This exquisite 0.475 ct oval cabochon presents nature's artistry in its purest form—transparent quartz interlaced with delicate black rutile filaments that create an entirely individual composition. The polished, domed surface renders it equally suited to bespoke jewelry design or discerning gemstone collections. A testament to authentic mineral sophistication and enduring natural beauty.
Certificate :CA-QUAR026RB-003-093 Gem Type: Natural Clear Quartz Weight: 0.475 Carat Shape: oval Size: 3.9 x 5.9 x 2.3 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
