Gorgeous Natural Turquoise and Sterling Necklace

This fabulous piece is in very good to excellent pre-owned condition; I have, in fact, been the only owner. The turquoise itself is a beautiful robin's egg blue, with hints of green and some really neat visible matrix! I did try to figure out what it was, but I am not an expert in turquoise identification, alas. It has a lovely floral stamped pattern around stone in sterling silver and a 0.925 stamped sterling chain. There is a small maker's mark in the shape of a diamond on the clasp as well. The measurements are: Chain: ~8 inches per side from clasp to pendant, so about 16 inches in diameter Pendant: ~7/8 inches long and 1/2 inch wide