Take caution as some fakes, such as moissanite, may have similar dissipation times. If you have been researching certification and diamond quality, you may have heard the term fluorescence. This describes the phenomena of a diamond emitting a blue glow when viewed under UV light. This glow can range from faint to very strong. However, not all diamonds possess this quality, so an absence of this blue glow does not necessarily indicate that the diamond is a fake. It’s a fun test, but not the most conclusive. TRUTH: This will work for about a quarter to a third of diamonds because most that do will fluoresce blue. Diamonds can fluoresce with other colors, but +90% of those that do go blue. The UV light used at nail salons as a hardener works well. The newspaper test, or read-through test, is one of the ways you can test refractivity (a diamond’s ability to bounce, bend and refract light). Place the stone upside down onto a newspaper over the lettering in a well-lighted area. Be sure that there are no shadows being cast over the stone or the newspaper. If you are able to read the letters (even if there is a slight blur) the stone is fake. A real diamond will refract the light in multiple directions from its various facets. This refraction will prevent you from being able to see clearly through the diamond to read the lettering. TRUTH: This only works for unset, well-cut modern round diamonds. Take caution as it will not help with moissanite. The dot test also examines the refractive properties of a stone. Draw a small dot on a piece of white paper with a pen.
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