Outstanding Foiled Garnet Ring with Rose-Cut HaloWhile the main objective of foiling was to increase the color of the stone and to increase its brilliance, it was also used to impersonate another gemstone. In the 17th century, diamonds, emeralds, rubies, and sapphires, to name a few, were used in both rivieres and in esclavage necklaces. For those who could not afford these gemstones, rock crystals that had had the backs covered in foil could create the effect of these precious gems. This Victorian