BLUE SAPPHIRE ROYAL BLUE 0.81 CARATS CUSHION SHAPE - 20239 FINEST COLOR OF SAPPHIRE. 5.18 x 4.71 x 3.48 mm.Beautiful Center-stone for an engagement Ring. Heated to enhance Lustre and Color - The industry standard for Sapphire. Will make a Gorgeous Ring or Pendent accented with Diamonds. Gem with High Lustre and Good Clarity.
Large Sizes are Extremely Rare! A Gem of Lasting Beauty. Blue Sapphire: The most sought after color of Sapphire Chosen as the ideal gift for Royality. Royal Blue - The Finest Color of Blue Sapphire Refractive Index: 1.759-1.778 Hardness: 9 Chemical Comp: AL22O3 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 recognized by the luminosity of their light to mid-blue colors. Ranging from blue to purple and pink. Top-quality sapphires are extremely rare. Beauty, magnificent color, transparency, and durability are the main features. Color determines the value of a sapphire.Sri Lanka is known for the finest and the largest sapphires in the world.