I'm assuming opaque means no light passes thru. I have 3 hanging 1955 Rotoflex lights over my dining room, on a dimmer, so I can really replicate the early dim lightning! But I'm sure they could take them out into the daylight or hold them up to a dim light and see translucent. Would be surprised if they didn't know what kind of marble they were marketing. Nontheless, using my LED flashlight, no light passes thru. Do I not have Master Comets....?🤔
. 5/8"