Outside of the base measures 6 and 7/8 in. The inside of the glass measures 6 5/16 in. The base is ground. There are several flea bites. They are not considered chips. This shade sat in a brass student lamp. The crimped top is perfect. Great color. Overall size of the shade is about 8 and 1/4 inches wide. I will give great care in shipping this item. This shade gives the most beautiful light in a room.