 These bulbs tend to be transparent white or colors, and are often ornately designed with crystal-like patterns.Later bulbs called C7½, have diameters of seven and a half 1/8th inches ( in, or 24 mm) using an E12 candelabra base; however, these have a blunt shape (and should therefore be called B7½, or B24).Mixing metric and English units, there are also now G30 globes which are 30 mm ( in, or G9½) in diameter using these sockets.