Not the highest grade aquamarine but it's 100% natural and GIANT. These juicy rondels make a huge impact at a price that makes it hard to believe it's aquamarine- but it is. They are graduated from about 8mm at the ends to the largest center bead which is about 22mm. The facets are sharp and even-very well finished but the impact of these beads is a very "natural" look. There are 43 beads on this 17 inch strand.