Ruby and diamond ring, circa 1910. Thailand, alongside neighbouring Myanmar (Burma), is famed for its amazing mineral deposits, particularly its superb rubies. The ruby at the centre of this ring epitomises everything that these Thai stones are revered for – a deep, velvety red, with the slightest hint of purple. In addition to this gorgeous body colour, this example is unheated – a rarity for rubies in general, particularly with Thai stones. Finished with a border of glittering white brilliant-cut diamonds and complemented by a yellow gold band, this is the perfect ruby cluster ring – a classic and romantic choice for an engagement.