The auction on Thursday totaled $30 million, with strong demand for colored gemstones, white and colored diamonds and jewels ...

The engagement ring, designed by celebrity jeweler Neil Lane, features an emerald-cut diamond centerpiece flanked by tapered diamond baguettes. The platinum band showcases 56 round brilliant-cut ...

A platinum ring centered with a 19.14-carat emerald-cut diamond with D-color and VS1 clarity. The main stone is flanked by several baguette-shaped diamonds. Its estimate is $700,000 - $1 million.

While we're all familiar with the more classic circular, square, emerald or oval cuts, the marquise-cut engagement ring ...