The slain actress’ opal and ruby ring from director Roman Polanski has a controversial history. Sharon Tate was rising to new heights in her acting career—and just over eight months pregnant ...

Our favorite is the five-ring Opal Thick Stacking Set. It includes a delicate rose gold birthstone ring (May shown), a beaded yellow gold spacer ring, and yellow gold, silver, and rose gold name rings ...

She then pointed out that technically it is called a boulder Opal because there is a "beautiful play of colors on the front side," and a matrix on the back. "When we look at the sides of the ring ...