- 18K Gold Plating - Solid Brass Base - Custom Design Inspired By CAMILLA - Cubic Zirconia Crystal Details - Size 7 Ring - Length: 2.5cm Our Palais Aetheria Ring Stack is refined luxury in a wearable statement. Inspired by Art Nouveau adornment, it is handcrafted in solid brass with 18 karat gold plating, inlaid with crystal detailing.