I wear mine everyday. Public transport, work, on the beach, supermarket shopping. I'll wear Cartier mixed with fashion jewellery silver, antique, vintage, retro, dressed up or down. There would be no point in me buying things I could not wear - or only wear once in a blue moon, I work almost every day.
Most of my Cartier is plain gold, either wg, yg, rg or a mixture or all three at once (none diamond-set) apart from one ring. I have colleagues who wear the most outrageous gem-set jewellery, particularly e-rings. I would feel more exposed wearing those kind of pieces because they 'demand' to be looked at.