0.5ct Square Halo Moissanite Ring – Sterling Silver Cushion Halo Engagement Ring for Her, Anniversary Gift for WomenNot sure of your ring size? Find it instantly with our free Ring Size Converter Modern sophistication with a clever twist this 0. 5ct Square Halo Moissanite Ring sets a brilliant 5mm round stone inside a soft cushion shaped halo. The square halo protects the centre stone and creates an optical illusion that makes it read larger and more radiant a sleek, contemporary look for the modern bride. Cushion halo makes a 0. 5ct centre look noticeably bigger