Mucking About with Precious Objects

I suppose it's a reliable question: put expensive things with cheap things, or put expensive things with expensive things? Contrast or complement? Tension or calm? It's not like you have to commit to one path or another for a lifetime, but within one photograph, you do. 30" Pearl 

Strand with Diamond Clasp at Kathleen Dughi

Sapphire Cabochon White Gold Ring with Marquise Diamonds at Kathleen Dughi

South Sea Pearl Earrings with Diamond Settings at Kathleen Dughi