We were lucky enough to purchase a handful of these STUNNING adjustable rings by revered Silversmith Adam Fierro of the Santa Clara Tribe. Each piece is completely handmade using sterling silver. The center stone is surrounded by a silver bezel and fixed to a thick adjustable silver band. The Turquoise is 100% Natural High-Grade Nevada "Godber". The rings are each adjustable between sizes 6.5-9.5, please see photos for measurements.