I had not noticed this about Camilla. However, it seems kind of ironic that the Queen also seems to wear the same pearl earrings 99% of the time to daytime functions. I have often wondered if she has some special attachment to these particular earrings and where they came from. Perhaps Camilla is following the Queens lead (you know, imitation is the purest form of flattery)!
I'm sure that is a grat consolation to HM, especially when Camilla appears laden with more diamonds than the Queen herself!
The Queen's pearl earrings belonged to Queen Mary, and are secured with a diamond stud. These earrings were popular with QM for daywear; the Queen must like them for the sentimental attachment and for the fact that they are discreet and perhaps comfortable to wear.
As for Camilla's wardrobe being tasteful and appropriate, opinion is divided over that. Just how frugal she is with her clothing is also open to debate, as her clothing requirements must now be huge, compared to the days when she could tramp around the countryside in an old barbour covered in doghairs and a pair of muddy wellies. These outfits won't come cheap, nor the oversized millinery. There is no denying that she needs to dress to a certain standard and her clothing befits her status (after all, we don't need another 'Princess Parsimonious') but the expense must be considerable. Still Charles pays for all of that, so really it is their business........
Her jewellery collection now rivals that of many queens, augmented by fine pieces from Cookie's collection and frequently enhanced by purchases made by Charles; all a far cry from her down-market country look of yesteryear..............