Shop › Art Nouveau Opal & Ruby Pendant Necklace Image 1 of 5 Image 2 of 5 Image 3 of 5 Image 4 of 5 Image 5 of 5 Art Nouveau Opal & Ruby Pendant Necklace £375.00 This opal and ruby gemstone pendant necklace dates to the Art Nouveau period and is set on a 15ct gold chain. Quantity: Add To Cart Added! This opal and ruby gemstone pendant necklace dates to the Art Nouveau period and is set on a 15ct gold chain.