All Rivelin products are available with a choice of three fuel beds, Cool white pebbles, Ceramic ice and Black diamond. Cool white pebbles come as standard and Ceramic Ice and Black Diamond are available at a further cost. It is unusual for white pebbles to be available with an outdoor fire, the Rivelin burner is so clean burning, that we can use white pebbles even on LPG without them getting soot deposits. Ceramic Ice is a wonderful addition offering a modern contemporary look whilst having your guests wondering why the ice is not melting. Black diamond is a sparkling accicular material the equivalent of a black fools gold. Whatever you choose we are sure you will be delighted.