About Diamonds > Lustre, Brilliance & Fire

These are more than just poetic terms. Each is a phenomenal characteristic in which diamonds surpass all other gems.

  • Lustre is the way in which light is reflected from the surface of the stone. The mirror-like finish achieved by the polisher ensures that 17% of light is immediately reflected (glass is about 5%). This is higher than the lustre of polished metals.
  • Brilliance. The light that enters the stone is then reflected off the back facets inside the stone and out through the top again. The best test of brilliance is to hold the stone at arm’s length or view it at a distance. A well-cut stone will look as if it has a light behind it.
  • Fire is the word used to describe the way in which diamond is able to break white light up into the rainbow colours. Hundreds of little flashes of ‘fire’ will be seen in a well-cut stone.

About Diamonds > Lustre, Brilliance & Fire

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