Solitaire Cushion Cut Sapphire Engagement Ring in Platinum.  This modern engagement ring features a magnificent 4.45 carat cushion cut sapphire with .42 carats of accent diamonds and is set in platinum. The classy design of the ring starts at the incredible sapphire which is then flanked by trapezoid diamonds that run into baguette cuts. The shoulder accents are laid out in such a clever and deliberate design all of the stones look like they were meant to be next to one another. If you are looking for a striking sapphire engagement ring, you cant do much better than this ring.