These 5/8" pieces most likely come from vintage canning jar glass bottles. They tumbled for many years in the Pacific Ocean before being discovered on a rocky shore. They hang from sterling silver, fully closing kidney ear wires. The spiral cage is silver plated for durability.
Your earrings will arrive in a cotton-lined gift box with a card that tells the short story of sea glass and the name of the ocean where your pieces were beachcombed.