A. Link Lattice Brilliant Diamond Engagement Set. A. Link Lattice Diamond Engagement Rings. In the Lattice Collection, precious gems take center stage in exquisitely crafted mountings that deliberately expose all of a diamonds dazzling magnificence. Metal is minimized allowing light to fully immerse the diamonds. These rings are made of 18 carat white gold and are set with round brilliant-cut diamonds. The engagement ring has a prong-set diamond and both rings have diamonds set all the way around the band.