Frame color: Black; Lens color: Gradient Grey Polar; Frame material: Acetate. These Swarovski SK6031 sunglasses feature a butterfly frame made of acetate, embodying femininity and elegance. The black color and grey lenses create a sophisticated look. They are perfect for round, square, and oval faces as they help to elongate and balance facial features. The sunglasses also include Swarovski crystal embellishments, moulded nose pads, polarized lenses, and slim arms for a comfortable and stylish fit.