You have in your possession a stone or have one that looks like a diamond but not sure if it is a diamond? You look at the sparkly stone resting on the palm of your hand and you think to yourself, it must be a diamond.

Below is a guide to help you identify if your stone is a diamond by preforming small tests or identifying different features on the stone.

  • Compare stone features
  • Perform the water test
  • Perform the black light test
  • Seek professional advice

Compare stone features:

Diamonds have distinct features compared with other gemstones, see the pictures below to help you compare their appearances:


Water test

Diamonds posses a different mass compared with other gemstones. A test to identify if the stone is a  diamond is to measure its mass. To do so follow these simple instructions:

  1. Fill up a glass of water
  2. Place your stone in the cup

If the gemstone sinks to the bottom this indicates the stone may be a diamond, if the stone floats to the middle or stays at the top then it is not a diamond.

What causes this phenomenon?

This is be because diamonds are much denser and have a greater mass compared to their imitations.

Black light test

Certain diamonds when exposed to ultra-violet light turn a slight blue color, follow these steps to perform the test:

  • find a dark room or a room with not too much light entering
  • shine the ultra-violet light on the diamond

If the diamond has a blue appearance then this is a sign the stone may be a diamond.

Seek professional advice

If the above tests did not help to confirm the stone or you want to be 100% sure with your results seek the expertise of a certificated gemmologist, diamond grader or jewellery valuer.

The following professionals are trained to identify these gemstones and will ensure you receive the correct final verdict on the gemstone type you have in your possession.

Click here to find a jewellery valuer near you in Australia



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