Blue 12x16 MM Pear Blue Sapphire (GF) Faceted Loose Gemstones for Birth month April Gem Cutters. Blue Sapphire (GF) Brilliant Translucent with Smooth Faceted Chunky Pear for Birthsign Cancer. Precious Glass Filled Loose Gemstones Approx Weight is in between 11-16 Carat.