An aquamarine cubic zirconia crystal is set inside 9ct yellow gold to create teardrop-shaped earrings that make a perfect match for a March birthday. With a face size of 7.5mm x 5mm and a distance of 11mm from front to back, the studs have a pin width of 0.65mm and weigh just less than half a gram. Stamped with a 375 metal mark, butterfly backs hold them in place.