Vintage David Yurman Chalcedony Cabochon Ring in 18k Yellow Gold and Sterling Silver

Vintage David Yurman three-band ring in 18k yellow gold and sterling silver with an oval cabochon cut chalcedony stone.  ID#: RG986 Chalcedony: One (1) bezel set, oval cabochon cut chalcedony stone measuring approximately 7.74mm x 5.73mm x 8.43mm  Metal: 18k yellow gold and 925 sterling silver  Size: 6 Band Width: 12.5mm  Weight: 10.75g  Markings: 'D.Y.' '925' '750'