The Princess of Wales brought back a sparkling necklace and earring set for a Cancer Research UK event.

Ruby necklaces have long been a love, passion, and grace accessory. The deep red of the ruby, also known as the "king of the gemstones," has fascinated those who wear jewelry since time immemorial.

Difficult-to-impress gem dealers attending the week-long Baselworld watch and jewelry show that ended on Thursday were lining up to see a $35-million necklace set with 60 carats of rare Burmese rubies ...