The "Someone Like You" singer showed off her expensive diamond after confirming she and the sports agent were engaged after ...

“I don’t believe an engagement ring has to be a diamond. Anything you find beautiful—a perfect single pearl, so chic—is right ...

The textured gold mount centering a collet-set pear-shaped sapphire surrounded by brilliant-cut diamonds, size 49, signed Gianmaria Buccellati, Italian maker’s and assay marks for gold.