The 18k gold ring, which features a 21.86-carat Colombian square-emerald-cut emerald, is from the collection of Cecile Zilkha. The Sotheby’s New York Magnificent Jewels sale achieved $46.9 ...

Diamonds ARE forever. A 100-carat emerald-cut diamond went up for auction Tuesday at Sotheby's in New York City. It ended up fetching more than $22 million, according to Sotheby's catalogue listing.

Diamonds in different shapes. Zimmerman says step cut diamonds – which include emerald, baguette, some cushions and Asscher-cut – are "very much on trend," noting the ring Jennifer Lopez ...