FAQs

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Alexandrite exhibits a remarkable colour change due to its interaction with light under different conditions. This happens because chromium ions within the crystal lattice absorb specific wavelengths of light. In daylight, which has more blue and green light, the stone appears green. Under incandescent light, which has more red wavelengths, it appears red. This phenomenon, known as the alexandrite effect, is a rare optical property. Read More…

Opal displays a vibrant play of colours due to its unique internal structure of microscopic silica spheres. These spheres are arranged in a regular pattern, which diffracts light as it passes through. The size and arrangement of these spheres determine the colours observed. Larger spheres produce red hues, while smaller ones result in blues and greens. This optical effect is called play-of-colour and is exclusive to precious opals. Read More…

The cat’s eye effect, or chatoyancy, arises in gemstones like chrysoberyl when needle-like inclusions or parallel fibres are present inside the crystal. These inclusions align in a specific orientation, reflecting light as a single, narrow band that appears to move across the surface of the stone when it is rotated under light. This effect is enhanced by cutting the stone in a cabochon (domed) shape. Read More…

Gemstones derive their colours from trace elements, crystal structures, and light interactions. For example:

  • Chromophores like iron, chromium, or titanium absorb specific wavelengths of light, producing colours.
  • Structural features like inclusions or defects can scatter or absorb light differently, adding to the colour.
  • Phenomena such as dispersion, diffraction, or interference, as seen in diamonds and opals, can also influence a gemstone’s appearance. 

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The Facets Sri Lanka gem show, started in 1991, is a premier international gem and jewellery exhibition showcasing Sri Lanka’s finest gems, jewellery, and minerals, attracting global buyers and industry experts annually. Read More…