This is a set of 9 sapphires in a square cutting style (not princess), The stones vary in size a bit. The smaller ones are about 3.6mm and larger ones are ~4.5mm. The range from green-blue to medium blue in color. All show no eye visible inclusions (at least to my 61 year old eyes), Nice set of stones for a jewelry designer or a novice. These stones were all part of a lot I bought in Tanzania over a dozen years ago, and have no enhancement other than simple heat.