The diamond face shape is a variation of the heart shape. The cheekbones are high and strong, and the distance between them is slightly wider than the forehead length. A pointy chin and high cheekbones define this face shape. Diamond-shaped faces also have a narrow forehead. If you have a diamond-shape face. You have a wider range of sunglasses styles to choose from. Go for round, oval, rectangular, aviator, semi-rimless and cat-eye glasses, which play nicely with a diamond face's angular features.