From Gwen Stefani's $500,000 sparkler to Mariah Carey's 35-carat emerald-cut diamond, here are the most expensive celebrity ...

Princess cut diamond rings are a symbol of strength ... this shape is best for people who live passionately and boldly. Oval diamond engagement rings offer a distinctive twist to a classic ...

Princess Anne has had not one, but two sapphire and diamond engagement rings. In her engagement to Mark Phillips in 1973, her first ring featured a two-carat cabochon cut blue sapphire stone on a ...

Jennifer Lopez's engagement ring (her second from Ben Affleck ... The unconventional style featured both a teardrop-cut diamond and a princess-cut diamond on a thin gold band.

A week later, Google reported that searches for marquise engagement rings ... cut has an elongated, oval shape with pointed ends, making it stand out from more traditional cuts like round or princess.

Maxwell Stone, of jewellers Steven Stone, said: "Princess Charlene of Monaco’s show-stopping engagement ring features a massive three-carat, pear-cut diamond flanked by smaller diamonds in ...