Onyx Stoneis a metamorphic stone formed by the metamorphosis of limestone, the main mineral of which is the most stable form of calcium carbonate. This mineral has large and specific crystals or in the form of granular masses, the most obvious feature of which is the light passing through it due to its high purity and transparency (unlike marble). For this reason, the price of this stone is higher than other stones and they also have very high beauty, polish and transparency.