Vintage Diamond Riviere Necklace

Classic diamond Riviere necklace with an estimated 15 carats of diamonds set in platinum. The diamond quality ranges approx G-H color, Si1-Si2. An additional pendant can be attached to the central diamond from an invisible hinged loop. American in origin. Circa 1980. 

Necklace measures 18" in length. Hidden push tab closure at back. It lays beautifully on the neck and would be great layered.