4 Carat Cushion Cut Sapphire Engagement Ring in PlatinumThis stunning engagement ring features a 4. 18 carat sapphire in platinum. A collection of . 32 carats of tapered baguettes flank the center stone. Sparkling and royal in color! The deep blue sapphire is simply incredible, with a fabulous facet structure creating amazing refraction and a diverse range of blue colors. This is a truly special engagement ring with a clean design and a memorable center stone.