4 The 'diamond gap' fingernail test can indicate whether you have finger clubbing 4 Finger clubbing causes nails to curve more than usual - the change can happen gradually Credit: Kennedy News and ...

A ‘fog test’ can be helpful Jewellery appraiser Kevin Zavian told PBS’s Antiques Roadshow that one way to test a suspicious stone is to simply breathe on it. “The cz [cubic zirconia, a synthesized ...

In the past, one of the most common techniques to test if a diamond was real or synthetic was to scratch the gem against glass — if the glass is scraped or scratched, the diamond's real. But ...

The five-second 'diamond test' is one method that can aid in early detection of lung cancer. Also known as the Schamroth window test or window gap test, it can be performed at home.

This is a delicate test, because it is difficult to see even a sharp and well-defined object through a diamond. The single refraction of the gem also allows one to determine an uncertain stone.

Imagine stumbling upon a diamond while walking through nature – it’s every gem hunter’s dream! In this video, we reveal the most effective methods to identify rough diamonds and the crucial ...