This is a absolutely stunning blue green Montana sapphire that we had heat treated to bring out it's natural beauty. The clarity is si it does have some flaws but the heating hid them so well so they are hidden most of the time. This is a really rare large Montana at 4.22ct 9.5mm. The color is the true selling point on this piece from deep blue with hints of teal. This is truly a one of a kind piece.