This is a beautiful, hand crafted (full size) chess set carved from Travertine, aka Onyx Marble from Pakistan.
The darker pieces are green with bands of red and yellow mixed in creating a gorgeous combination of colors. The white pieces are predominately solid white with some pieces displaying small veins of other colors intermingled.
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.
Please note; every piece is unique and may differ slightly in pattern and color from the example pictured.