false diamond

false diamond

n
(Jewellery) any of a number of semiprecious stones that resemble diamond, such as zircon and white topaz
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
More importantly, make sure your thong is peeping slyly over the top of your waistband with the false diamond nicely polished.
A friend said: "Victoria didn't want anyone to think something was wrong, so she put a false diamond in the ring and no-one noticed."
It was a Frenchman, Georges Frdric Strass, who began experimenting with lead glass in the 18th century, cutting it into facets to produce what he called "false diamonds" which he then set in silver, the glitter of his stones often enhanced with a foil backing.