The physics are simple. A higher refractive index means more light is returned to the eye. A higher dispersion rate means that light is split into a wider spectrum of colour. ZEVERRA stones measure 2.65 on the refractive index — capturing and returning more light than any conventional gemstone. Their dispersion rate of 0.104 produces vivid spectral fire: the flashes of colour that move across the surface as the stone turns in the light. At 9.25 on the Mohs hardness scale, ZEVERRA sits in the highest tier of gemstone durability. The crystal structure resists micro-scratching — the invisible surface damage that causes lesser stones to cloud, dull, and lose their brilliance over time. A ZEVERRA stone will look the same in twenty years as it does today. This is not an imitation. This is engineering.

Brilliance is measured by refractive index — how much light a stone captures and returns to the eye. Fire is measured by dispersion — how widely a stone splits white light into spectral colour. On both measures, ZEVERRA leads.
Cubic zirconia and crystal glass develop surface micro-scratches through daily wear, causing progressive clouding and loss of shine. At 9.25 Mohs, a ZEVERRA stone is resistant to this degradation — which is why we guarantee it for life.