Here are a few Different Diamond mold chips I have. I collect manufacturing styles and I also look for the smallest detail variations. Some of these may look the same at first glance, but all are different in the size and shape of the diamonds. Also, the width and spacing of the incuse rings and raised edge areas. The Chinese lettered chip in the center has circles in the mold, but they are worn and hard to see. the chips in the second last row and the white chip in the last row have squares turned on their side to be the diamonds. The white chip in the bottom row has very wide inner and outer circles on either side of the diamonds. The circles on the light blue chip in the second last row, though similar, has narrower circles. Some of the chips are clay and some plastic. Some have metal weighted centers........The devil is in the details.