Appreciate the beauty of amethyst with these sterling silver 4mm stud earrings. Made of sterling silver and measuring 5mm High x 5mm Wide x 4mm Deep, the two cubic zirconia crystals are 4mm and cast in a rub over setting, which puts all the focus onto the crystal itself so they'll be sure to stand out! Amethyst is the birthstone for February so these studs make for a simple yet stunning birthday gift. They weigh 1g and have 11mm pins.