Hessonite is a variety of Grossular garnet with lower specific gravity than other types of garnet. It has low iron content and a light to dark orange color. It is sometimes known as “cinnamon stone.”
Chemical composition: Ca3Al2(SiO4)3; Hardness: 6.5-7.5
Silver was known as Argentum in ancient Rome, thus its abbreviation as Ag. It is a member of the copper group.
Chemical composition: Ag; Hardness: 2.5-3