1.54 ct Blue Sapphire
While the octagon radiant cuts are common in yellow Sri Lankan sapphires, it's relatively rare to find them in blue. Here is a very attractive example with great color, size and clarity. As with most sapphires, it appears a more saturated color in natural lighting than indoor (see hand shot).
Dimensions: 6.57 x 5.15 x 4.81 mm
Origin: Sri Lanka (Ceylon)
ID Report: AGL