How can I tell the difference beween coloured glass and a cubic zirconia?
In the old days, glass was usually coated on the back to keep the colour, and stones, had no coating. But now with completely coloured glass how can one tell?
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SkateRForeveR
on February 8th, 2012
There are several easy methods. The first is the difference in hardness. The Cubic zirconia will be about 8.5 on the Mohs scale. This is harder than glass.
Another way might be to find the density. Few glasses have a specific gravity betwenn 5.6 and 6 (which is the range for CZ).
If you can measure the dispersion of the light through the gem, the Cubic zirconia will be very high (near .60) which is even higher than that for diamond.
The fastest way for most people without specialized knowledge or equipment is to place the “stone” under a shortwave Ultraviolet light. The CZ will luminesce yellow, greenish-yellow or a shade of tan.
Fractalfallout
on February 8th, 2012
Without any special equipment, examine the facet edges. In glass they can appear rounded or the surface of the stone may be pitted. In glass, air bubbles are not uncommon, whereas you will never see them in CZ. The facet edges of CZ look real sharp. Also, it is so much harder than glass that it would be able to put a scratch on a window, for instance. CZ also splits the light into rainbows, (dispersion) way better than glass, so it’s brighter…more attractive.