Early 20th Century Austro-Hungarian 18ct Gold and Platinum Ruby and Diamond RingA striking early 20th century ring set in 18ct yellow gold with a platinum topped setting, dating to the 1910s. The design bridges the flowing elegance of Art Nouveau and the emerging geometry of early Art Deco, giving it a wonderfully transitional character. At its centre sits an elongated hexagon shaped diamond, a beautiful and unusual choice for the period. Rings of this design more commonly feature a round cut diamond, making this example