The colours of gemstones are affected by differences in chemical and atomic structure, leading to the absorption of different wave lengths of light. Their hardness is measured on the MOHS scale, which runs from 0-10. Scroll down to know more about our stones.
emerald brut

Emerald Be3Al2(SiO3)6 Hardness: 7.5-8.0

Ruby Al2O3 Hardness: 9.0

ruby raw
sapphire raw

Sapphire Al2O3 Hardness: 9.0

Onyx SiO2 Hardness: 7.0

onyx raw
zirconia raw

Zircon ZrSiO4 Hardness: 7.5