We sell rough and cut gemstones, offering a wide range of rough gemstones for specimen-cabbing-facet and beautiful cut stones ready for your mount..Either for a new piece of jewelry or replacing a stone in an existing piece of jewelry.We offer thousands of lots, all with individual photos, what you see in the photo is what you will receive. Tommysrocks, an internet only business since 2002, giving our internet customers 100% of our attention.
IF VERY HIGH QUALITY & FREE FROM INCLUSIONS.
VVS HIGH QUALITY WITH VERY SLIGHT INCLUSIONS.
VVS1 HIGH QUALITY WITH SLIGHT INCLUSION.
VS FINE QUALITY WITH INCLUSION SLIGHTLY VISIBLE TO THE NAKED EYE.
VS1 FINE QUALITY WITH INCLUSION VISIBLE TO THE NAKED EYE.
SI GOOD QUALITY WITH INCLUSIONS VISIBLE TO THE NAKED EYE.
SI1 INCLUSIONS BECOMING PROMINENT TO THE EYE.
THIS GEMSTONE IS GRADED: I F
Topaz (aluminum fluor-silicate)
Color: Blue, colorless, pink, orange, red, champagne, sherry-brown, brown and yellow.
Sky Blue - Light blue
Swiss Blue - Medium blue
London Blue - Dark blue, generally with steely undertone.
Imperial - Orange, pink and red.
Mohs hardness: 8
Refractive index: 1.61-1.638
Critical angle: 38°
Specific gravity: 3.53-3.56
Cleavage: Very perfect in one direction.
Fracture: Conchoidal, uneven.
Dispersion: Medium (.014)
Heat sensitivity: None
Pleochroism: Dichroic – Blue: weak (light-blue to pinkish or colorless); Brown: definite (stronger yellowish cast); Green: definite (Pale-green to paler or colorless); Pink: definite (pink to pale pink or colorless); Red: strong (deep red to pinkish red); Yellow: definite (lighter to deeper yellow).
Birefringence (double refraction): Weak (.008-.01)
Crystal structure: Orthorhombic
Treatments: Blues are irradiated and heated.
Cutting: Orient the stone 7 to 10 degrees away from the cleavage plane.
Polishing: Alumina on most common polishing laps or 50,000 diamond on tin/lead or ceramic lap.