This Modern Era engagement ring might just give Princess Dianas engagement ring a run for its money. Set in platinum, the center stone is a stunning 7.62 carat, cushion cut, blue sapphire set in four prongs. The sapphire is surrounded by 2.15 carats total weight of diamonds, but what makes this ring unique is that while there are ten (10) round brilliant diamonds that crest the top and bottom of the sapphire, two (2) trapezoid shaped diamonds which fit perfectly into the halo.