Dido Valley Road is the Topstones factory, the largest gem tumbling plant in the world.
Visitors can watch the operations and there is a factory shop, also refreshments.
It houses a collection of local memorabilia, and depicts the cultural history of the town, including the Royal Naval presence. Cells and stocks can be viewed. Historic walks of the town by arrangement. Access from Court Road and from St. Georges Street. The road winds up the slopes of Simonsberg to a height of 260m and fine views of the coast are obtainable from picnic spots.