Lustre is the surface glow, the deep mirror-like reflection of the light, or inner light. The better the quality and depth of the nacre the better the depth of colour, the better the lustre. Broken Bay peals have an average nacre thickness of greater than 1mm. This quality far exceeds the current Asian standard. The lustre of the Broken Bay pearls is exquisite and a direct result of the temperate and pristine waters in which they are nurtured.