This pretty piece is circa 1990s. The gemstone is a Mystic Topaz and the mounting and chain are 14k yellow gold. The heart shaped Topaz is mostly deep red but when you turn it I see a flash of orange and pink and it's a lighter shade than my picture reflects. It measures 1/2 X 1/4 inches, including the bail and the chain is 16 inches long. The Topaz is faceted nicely and for those who are not familiar with Mystic Topaz, they are color treated. The gem mounting has an antique look to it.