Blue Bead Agave is a large oval shaped concho button, 1.5" across and 1.25", or a tiny bit less, with a faux turquoise center and scallops and diamonds around the edges. Chicago screw is 3/16" deep. Nickel Silver. Made in the Four Corners area of the US, one at a time, by hand, not in a factory in China. No two center stone settings will exactly match, as you can see.