It is not Hollow or Plated. Perfectly polished, excellent quality, nice looking 7 band puzzle ring. It measures 12.5 mm(~1/2") on the face and 8 mm (5/16") on the bottom. The ring pictured above is size 8 and and weighs almost 10.5 grams of sterling silver. Available sizes 5 to 13 with half size increments. Ring has a hallmark of 925 (which means Sterling Silver) at the inner surface of the face of the ring. Bottom shank of the ring is very well designed against wear.