The travertine is a limestone, composed of calcite, aragonite and limonite, with compact bands, parallel to each other, in which small cavities are observed, where they predominate the tones that pass through the white, green or pink, often presenting marks of branches and leaves. It is also known by the name of limestone tufa.
There are large quarries of this type of rock in Mexico, Turkey and Peru, but the most famous varieties are Italian, with Tivoli being one of the most sought after.
The photographs presented do not imply that their supply is absolutely identical, for example in tonality, since they are natural products, which although carefully selected and elaborated, may be subject to slight variations in shade, granulation or composition.
These variations that nature introduced can not be considered as defects.