Crystal Caste
Crystal Caste, a manufacturer of gaming accessories like dice, used to have a line of really cool stone Icehouse pyramids. They were available either completely solid or stackable, and are made from various different kinds of stone.
![Crystal Caste Pyramids](http://static.miraheze.org/looneypyramidswiki/9/98/StonePyramidsMontage.jpg)
They are described in detail in the Wunderland Weekly News, and were bought from Crystal Caste.