This gem is 100% Natural with Natural color. Not Treated in any way. Beautiful Center-stone for an engagement Ring. Will make a Gorgeous Ring or Pendent accented with Diamonds. Gem with High Luster and Good Clarity. Large Sizes are Extremely Rare. A Gem of Lasting Beauty. UNHEATED SAPPHIRES - Almost all Sapphires mined Raw or Geuda form are Heat Treated to high temperatures to induce color and to enhance clarity and luster. This process is now the Industry Standard for Sapphires. This Sapphire is UNHEATED. Certified No Thermal Treatment(Please see Certificate)
Refractive Index: 1.759-1.778 Hardness :9 Chemical Comp. : AL 2 2O 3 Density : 4.00 Crystal Group :Hexagonal
The Sapphire belongs to the corundum group, with excellent hardness, exceeded only by Diamond –the hardest mineral on Earth.The oldest sapphire finds are in Ceylon , or Sri Lanka as it is known today where they are mined from ancient times. Ceylon sapphires are recognised by the luminosity of their light to mid-blue colours. ranging from blue to purple and pink.The Blue Sapphire is chosen as the ideal gift for Royalty.Top-quality sapphires are extremely rare. Beauty, magnificent colour, transparency, and durability are the main features.Color determines the value of a sapphire. The most valuable colors for blue sapphires are violetish blue. Highly saturated medium or dark medium tones are best.