Art Nouveau Inspired Peridot & Marcasite Ring in 18ct Gold Plated Silver Border Terrier Welpen von der Birkenheide. Add a touch of timeless glamour to your ring stack with this beautiful Art Nouveau style ring crafted in gold plated sterling silver, featuring a central marquise cut green peridot surrounded by sparkling marcasite stones. Gemstone Information Ancient Egyptians named peridot the 'gem of the sun' due to the brilliance it showcased in the desert sun. Peridot is the birthstone for August and is used to mark 16th wedding anniversaries. Marcasite is a type of pyrite which reflects with a captivating metallic charm. Popular in the Victorian era of jewellery making, marcasite gems were once used as an affordable substitute for the sparkle of a diamond. Jewellery Collection Bring a touch of old world glamour to the modern day with the Gemondo Art Nouveau inspired collection. This range celebrates the iconic art movement through nature inspired, asymmetrical designs paired with colourful gemstones.