Though the circle is a pretty common design element, Tiffany managed to elevate it to style must-have when they introduced their now widely copied diamond Bubbles ring. It was later followed by a matching pendant and earrings in various metals and stones.

Judy Geib’s 18k yellow gold and moonstone Bubbly earrings also use circles in perhaps a more playful way. The oversized curlicue form is set with cabochon moonstones, and sells for USD $1875 at Barneys.