Diamonique is the brand name used by television shopping network QVC for their cubic zirconia simulated diamond and other synthetic gem products (cubic zirconia is a common type of gemstone substitute). QVC acquired the manufacturing facilities, proprietary technology and trade name rights from MSB Industries, Inc. in 1988.
The name "Diamonique" was also used as the brand name of a synthetic garnet that was diamond-like in appearance and manufactured in the 1970s.
References
Diamonique Wikipedia(Text) CC BY-SA