Two of those vibrant, bigger, and brightest diamond engagement rings that stand the test of time are given below.       Blue Sapphire with Diamond Halo Prince Charles of Wales proposed to Lady Diana in February 1981 by gifting her an oval-shaped vivid blue sapphire diamond ring. The white diamond band was beautified by adding a halo of tiny solitaires around the main gemstone. Later in 2010, the Duke of Cambridge, Prince William, gifted his mother’s diamond engagement ring to the present Duchess of Cambridge, Kate Middleton. This way, he intended to keep his beloved mother’s memory alive. Besides, the antique diamond ring looks as stunning on Kate’s finger as it was on Princess Diana’s. Emerald and Diamond Ring Another timeless example in colorful diamond engagement rings is the one gifted to Jacqueline Bouvier by John F. Kennedy on June 24, 1953, while asking her hand for marriage. The iconic diamond engagement ring features a baguette diamond of 2.84 carats and a green emerald cut diamond of 2.88 carats at its focal point. The dazzling appeal of the ring is lifted up by giving it an open-halo setting and some filigree detailing. As glamorous and legendary as the beautiful couple, this antique diamond ring never lost its iconic appeal till date.