Emerald

About cerussite’s extreme sensitivity to thermal shock, Joel Arem writes: “This property became painfully evident when a 300+ carat, flawless,…

Cerussite, 34.67 cts, 13.7 x 12.8 mm, square emerald cut, Tsumeb, Namibia. Photo courtesy of liveauctioneers.com and Heritage Auctions.

Emerald-cut dioptase, 0.65 cts. Tsumeb Mine, Otjikoto, Namibia. © Rob Lavinsky, www.iRocks.com. Used with permission.

Dioptase rough and cut set. Rough specimen: 4.5 x 4.2 x 4.0 cm (largest crystal: 1.2 cm); emerald-cut gem: 0.65 cts. Tsumeb Mine, Otjikoto, Namibia.…

This Victorian 18k yellow gold brooch features a pear-shaped, natural saltwater pearl center stone surrounded by 2 rubies, 14 emeralds, 10 round…

This chevron pendant/necklace with freshwater pearls, rubies, emeralds, and sapphires in 14k yellow gold won the 1985 AGTA Spectrum Jewelry…

18kt white gold ring with a 3.7-ct emerald-cut sapphire, flanked by two trillion-cut diamonds. Photo courtesy of liveauctioneers.com and Greenwich…

Emerald-cut peridot, 5.46 cts, Norway. Photo © Joel E. Arem, PhD, FGA. Used with permission.

9.84-ct, emerald-cut indicolite, Brazil. A pure, dark blue body color with indigo-colored ends. Photo © Joel E. Arem, PhD, FGA. Used with permission.…