Late 1800's Czech glass, rich opaque turquoise/capri blue. This color is amazing, and I love to mix the opaque greens and blues in my jewelry designs. 12mm diameter with 2 1/2mm hole, lamp wound and very rare! Sold by the pair. Last photo shows a pair of earrings I made using a larger handmade Thai silver earwire, item #SS201 for $10.00 per pair.