Diamonds have often been used to set around the finest of cameos. The crystal clear stones enhance the look of the cameo. Many of these cameos would have been carved from other semi-precious gemstones such as amethyst, sardonyx and even emerald.
The cut of diamonds used in jewellery can help identify the age of the piece as many cuts are now no longer used although some cuts are making a comeback in fashion. The website Brilliant Earth has more information the different cuts.