The reproduction diamond – something that is considered okay if the woman is aware of it, but thought to be the ultimate insult when she believes it to be real. Cubic zirconia, which are simply man-made diamonds certainly do not hold the same value is the ones crafted by Mother Nature, so you always want to be aware of what you possess.
The Fog Test If you blow a bit of hot air in the direction of a cubic zirconia, it will fog up quite easily. This milky appearance will remain for a few seconds and then disperse. However, a diamond is not so susceptible. It disperses heat easily and it will be very difficult to get it to fog up at all.
NOTE: Avoid trying the Scratch Test. This is the test that arrived from the theory that diamonds can scratch glass, but that other gemstones (including cubic zirconia) cannot. This isn’t true. Several gemstones can scratch glass and this test can damage your stone. Whether real or fake, it is going to be worth less if you harm it.
The Inclusion Test You will need a special tool for this test. Referred to as the jeweller’s loupe, this magnifying tool allows for close inspection of the diamond. There are various qualities of loupes, but they are easily accessible to the general public. They can even be purchased on sites like ebay.co.uk and amazon.co.uk. They cost as little as £5.
Inspect your stone with the jeweller’s loupe. The goal here is to spot imperfections in the diamond. Minute internal dings, spots, or flaws are present in nearly every natural stone. These are known as inclusions. Cubic zirconia will not contain inclusions, as they are man-made.
See a Jeweller If you still aren’t sure that your diamond is the real deal, visit a jewellery shop and settle the matter. There is no better way to determine the worth of a stone than to ask a professional.