Seen in one direction, most blue-blue sapphires to violet-blue blue, from the other direction, are turquoise. Sapphire is a dichroic stone, which means the color varies depending on the angle from which the stone is seen. In blue sapphire, the pieces can affect color in a surprising way. This means matching pairs are difficult to find in larger sizes. Instead, each stone is formed to maximize the results of coarse crystals. blue sapphire weighing one carat or more usually does not cut into calibrated sizes or standard shapes.
Although the supply of commercial-quality blue sapphires is now reliable, the rough quality of blue is always rare and expensive. In fact, silk inclusion can increase the value of stone by giving the impression of velvet like precious Kashmir sapphires.
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