‘Secret Cove’ Blue Montana Sapphire 3.42cts. This All American Sapphire® has been cut into our special design cut cushion called the ‘Secret Cove’. The design has near perfect symmetry and so it is quite lively displaying the highest possible color and scintillation from within the sapphire. This large heated Montana sapphire is very rare because of its size and it is quite free of imperfections. It has the best color available showing blue in daylight and shifting to a teal in fluorescent. Anyone who is interested in seeing the best in Montana sapphire will be drawn to the stone. There’s an excellent value.