When a gemstone is flawless, it does not have any discernible or visible inclusions or blemishes under 10x magnification. A diamond can be flawless or internally flawless. The latter is possible when there may be surface blemishes that can be polished away but not a single inclusion in the internal structure of the diamond, under 10x magnification. To determine whether a gemstone is flawless, a gemologist has to examine it using a benchmark of 10x magnification.
Most gemstones have at least a few inclusions or blemishes so finding one that has none is very rare. It is so rare to find a truly flawless diamond or gemstone, and the price point goes up significantly, that they may be considered actually less desirable for many diamond buyers
IF – Internaly Flawless Diamonds will Show No Natural Inclusions on the Inclusion Plot Map
