I only get jewellery when the other half screwed up and is in the doghouse. I am a girl and I do not necessarily like getting jewellery. Men tend to buy big, 'blingy' and gaudy. I like delicate barely there jewellery.
On another note, I only tell the other half he doesn't get it ... when we are having problems ... fighting ... that sort of thing. Sounds to me like he is using jewellery or gifts as a way to express himself or say sorry. Maybe she wants him, his time, his attention, help around the house. But definitely sounds like some undercurrent is running through their marriage at the moment.
Communication might be better than some bling ... hope it all works out for them.