This is a vintage gold ring stamped 18CT with diamond center flanked by four independently set smaller diamonds, 2 on each side. Diamond weight, approximated by the images, appears to be 1/2 to 3/4 carat size. The 18CT mark opposed to 18K mark indicates that this was likely made in Europe. Current gold market for 18K is $32.36AUD per pram. The estimate is based on actual past recent past recorded auction sales of comparables.