A 5mm cut padparascha sapphire is set in water-cast and granulated sterling. US size 5.25. Padparadscha is a scarce variety of sapphire. In fact, it's the rarest and most prized form of sapphire. It is also one of the most expensive gems in the world, with prices similar to those of emeralds and rubies. Padparadscha is also one of the hardest gems in the world, second only to diamond.Padparadscha is a gentle stone with enormous energy that is said to have many positive attributes. It is a stone that represents joy, vital energy, and foresight.