20.90 Carat Blue SRI LANKAN Cushion Sapphire GUBELIN

This is a 20.90 carat cushion-cut sapphire of Sri Lankan origin with no reported treatment. The stone carries certification from Gubelin, an independent gemological laboratory. It is offered as a loose stone, allowing for independent setting or evaluation. The blue coloration and substantial carat weight make this a notable example of untreated sapphire from the island's corundum deposits.