Certified origin. Untreated material. Average brilliancy of 40 to 60%. Add to 20% or deduct to 10% for other cutting. Prices for ovals and cushions. Add 8% to 10% for rounds and pears. Add 10% to 20% for emeralds and marquis.
Heat treated material. Average brilliancy of 40% to 60%. Add to 20% or deduct to 10% for other cutting. Prices for ovals and cushions. Add 8% to 10% for rounds and pears. Add 10% to 20% for emeralds and marquis. Note: If certified Burmese and untreated, add 50%, except fair or lower grades. Typically, mid-quality untreated blue sapphire will sell for 20-30% more than a treated stone of the same quality. Top-quality unheated stones could get a premium of 50% or higher, especially if they’re large.
Average brilliancy of 30% to 40%. Add to 20% or deduct to 10% for other cutting. Prices for ovals and cushions. Add 7% to 10% for rounds, pears and marquis. Add 15% to 30% for emerald cuts.
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Is a Variety of||Sapphire|
|Colors||Light to medium-tone pink-orange/orange-pink.|
|Fracture||Conchoidal. Frequent parting|
|Luminescence||Pink stones show strong orange-red in LW, weaker color in SW. Orange sapphires show a strong orange-red in the presence of LW. Synthetic orange sapphires: very weak, orange to red in SW.|
|Luminescence Type||Fluorescent, UV-Long, UV-Short|
|Optics||RI: o = 1.757-1.770; e = 1.765-1.779 (usually 1.760, 1.768); Uniaxial (-).|
|Optic Sign||Uniaxial -|
|Luster||Vitreous to adamantine.|
|Polish Luster||Vitreous to subadamantine.|
|Specific Gravity||3.99-4.10; usually near 4.0|
|Enhancements||Heat treatment (common for sapphires); diffusion treatment (occasional); irradiation (rare).|
|Typical Treatments||Heat Treatment, Irradiation, Lattice Diffusion|
|Transparency||Transparent to opaque.|
Padparadscha is a light to medium toned pink-orange to orange-pink hue sapphire.
Padparadscha is a Sinhalese word meaning lotus blossom.