Two x half carat approx diamond solitaire rings one very early stone: The older stone measures about 4.5mm wide, but will be slightly wider as this is collet set, it has a reduced number of facets and may be 18th century, the more recent claw set diamond measures 5mm, the estimate of half carat stones is based on diameter size only, and is approximate, the older stone set in un-hallmarked yellow gold, the other in white gold or platinum with small diamonds set in shoulders, sizes N & P (2)