I think the jewellery shows over the last couple of weeks have been a shambles.
There have been misspellings of gemstones, mispronounciation of jewellery styles, and uncertainty or disagreement about what shades particular gem stones come in. Several presenters keep getting the various eras mixed up.
I think they badly need to get a real expert of some sort, either to front the programmes, or, at the very least, to train the other presenters. I do not consider the people they currently have (Guy Whatsit, Jan Springer) even to be experts, based on some of the odd things they've said.
Some of the regulars would die rather than read a book - I hear them repeating incorrect things said by other presenters, suggesting they use each other (ie a pool of non-experts) as their one and only resource.
Frankly, they'd be better off sticking to 'This is a lovely shade' rather than continually mispronouncing 'bombe', or telling us something floral and organic is 'art deco', in an effort to appear knowledgeable.