Kate Middleton's had an on-again, off-again relationship with her engagement ring for a year. What's the royal secret about ...

Shop the best diamond engagement ring designs, from classic oval engagement rings to lab diamond engagement rings from brands ...

Princess Diana’s iconic sapphire and diamond engagement ... The now iconic ring features a 12-karat oval Ceylon sapphire set in 18-karat white gold and is surrounded by 14 solitaire diamonds.