Harry brings her shiny baubles at first. She eventually realises that they're not tokens of his love, merely status symbols. 'Look at how well I can afford to treat my wife', they shout. They're purely for show, much like she is.
It takes her a long time to fully realise her place in the world. Longer than it should, probably. But learn she does.
After conquering Earth, Harry – no, she remembers, the Master – decides that, now that no one cares about her appearances, he likes to score dark bruises into her neck, where diamonds once hung.
She misses being ignorant.