This is a huge 150mm diameter Sphere or Ball carved from a solid chunk of Travertine, which is banded Calcite, from Pakistan.
This Sphere comes with a clear acrylic stand so you can display it anywhere without it rolling away.
Travertine is a dense, banded rock composed of calcite (calcium carbonate, CaCO3). Formed by the evaporation of river and spring waters, it is a variety of limestone that has a light colour and takes a good polish. This stone commonly has a soft banding pattern and is very similar in color to Chinese Jade and sometimes even sold as it.