The technical requirements for the identification of rubies by quality requirements and technical standards are as follows:
Gloss: Glass luster to yam diamond gloss cleavage: no cleavage, double crystal development of the gemstone three sets of crack Mohs hardness: 9
Density: 4.00 (+0.05) 2/cm3
Photographic characteristics: heterogeneous, one-axis crystal negative chromaticity: strong, purple red, orange red refractive index: 1.762-1.770 (+0.09, -0.005)
Birefringence: 0.008~0.010
UV fluorescence: long wave: weak to strong, red, orange red short wave: no to medium, red, pink, orange red, a small amount of strong red absorption spectrum: 694nm, 692nm, 668nm, 659nm absorption line, 620~654nm absorption band, 476nm, 475nm strong Absorption, 468nm weak absorption line, absorption in the violet region.
Magnification inspection: needle-shaped inclusion body, gas-liquid inclusion body, fingerprint inclusion body, mist-like inclusion body, negative crystal, crystal inclusion body, growth pattern, growth ribbon, double crystal grain special optical effect: starlight effect, cat eye effect rare)
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