From the Provence Collection, the Provence Princess Stone Necklace with Blue Topaz Elements features a center cluster of London, sky, and Swiss blue topaz stones in different geometric shapes surrounded by small white diamonds on an 18k yellow gold chain with white diamonds set into it. 

18K Yellow Gold
London Blue Topaz, Sky Blue Topaz, Swiss Blue Topaz, White Diamonds
Diamong Weight: 0.20ctw
Length: 18 inches