It is solid Sterling with a thick layer of solid 14K Yellow gold. There are over 70 Natural Gemstones in this piece. The center stone is a large, 5.3 Carat Natural Rose quartz that is 14mm x 10mm.
There are 36 Natural Diamonds and 38 Natural Pink Quartz that are 1mm (three of them are 2mm). It will come with an 18 Figaro chain as shown (although this may not be the correct chain for this large pendant). The pictures just do not do it justice.