He's very stuck on the word hollow, which seems to have this very negative term in the jewellery industry, Hollow gold = cheap and nasty.
My mom had some solid gold necklace and ear rings, but she also once bought a hollow gold necklace. It was bigger than the necklaces she usually wore (if that thing had been solid, I shudder to think how much that would have weighed!), and certainly you could tell the difference in quality between it and the solid gold chains, but it was a fun, and in its own way nice and tasteful necklace. My mom would wear it for more casual occasions than she would her solid gold ones. Oh, but I believe the most expensive thing she had was the long pearl string necklace. That thing looked very tasteful and luxurious whenever she wore it.