This is the Summer Version of Paul Morelli's Pebble Waterfall Necklace. It 18k yellow, white & black gold (white gold plated with black Rhodium) & 20k pink gold. There are yellow, white & black diamonds integrated with a great variation of semi-precious stones such as Peridot, Blue Topaz, Pink Tourmaline, Citrine & Moonstones. The Pebble Collection was inspired by pebbles sitting below flowing water in a stream in the rear of the designer's cottage in New Hope, Pennsylvania.