Blue sapphire
Sri Lankan blue sapphire you can see that the stone does have transparency It does however lacks clarity and if anybody knows anything about stones. Their values determined by size cut clarity and color. Generally speaking if the color appeals to the eye then it's going to be more valuable and if it is less appealing to the eye then it will be less valuable. It is a 51 carat stone .51 plus carat stone where it lacks in clarity it makes up for in the size color is not perfect but once again size.