Feather light and supremely versatile, these post earrings have become a staple in my personal stash. Made of 18K gold bimetal that is textured and perforated, I seem to reach for them whether I go to the theater, out about town, even to the rock climbing gym. The gold used in these earrings is a bimetal manufactured by rolling and bonding under heat and pressure a thin layer of 18K gold on a substrate of sterling silver.