Northern Facet Halo Engagement Ring With 1.50 Carat TW of Diamonds in 18kt White Gold With Platinum Head. Our Colorless Collection engagement ring is a true work of art, crafted with the utmost care and attention to detail to create a piece that is both stunning and timeless. This breathtaking ring features a dazzling 1.50 carat round cut Canadian diamond, expertly cut and polished to maximize its brilliance and fire. The diamond is set in a halo of smaller diamonds, which add a touch of sparkle and glamour to this already breathtaking piece.