I like the diamond tennis bracelet. If you would consider buying preowned, you can get a much larger one within your budget - mine is 3.30 carat in 18k white gold (and with lovely bright and white diamonds) and I spent less than £1k, although admittedly that was a total bargain that I think I was very lucky to find. I’m pretty sure you could get at least a 2 carat preowned, maybe more. However, if you do want to buy new I echo what others have said and that you could still get bigger for your budget, so I would shop around.