A vintage sphere, carved from a solid piece of larvikite and polished. 

Larvikite is an igneous rock, rock which has been solidified by magma or lava, made up of varying pale and colourless crystals among other rock-forming minerals, giving this stone its characteristic silvery, deep blue tones. 

The name originates from the town of Larvik, in Norway, having been formed nearly 300 million years ago.