For more than 30 years, Bowling Green forgot about its historic and natural gem located in the heart of the city.

Only under the microscope can they he told from natural gems.

The large natural gem, owned by Billionaire Business Enterprises, is a bluish-green in color.

Cubic zirconia is relatively hard, 8-8.5 on the Mohs scale- slightly harder than most semi-precious natural gems.

Floyd Bennett Field is a 1,115-acre historical and natural gem in the southeast corner of Brooklyn.

The natural faceted gems were interspersed with hand-turned columns of rare and beautiful wood.

Gemology or gemmology is the science dealing with natural and artificial gems and gemstones.

A beautiful natural gem of a river that had been turned into a garbage dump and an oil slick because no one had thought to protect it.

Synthetic diamonds of gem quality are still more expensive than comparable natural gems because of the elaborate apparatus needed to make them.

Until the 20th century they were ground from tiny pieces of natural gems.