I don't think there's certain things that look rich, but I've noticed that there's different principles between people I know who are comfortably affluent Vs people who want to be seen to have money.
Nice car that suits their lifestyle and season of life Vs status car, usually on PCP that's upgraded every couple of years
Obviously good quality handbags that are probably expensive/designer but don't shout look at me Vs the latest it accessible designer bag that is heavily monogrammed /designed to show the label prominently
Dressing in natural fabrics Vs a lot of synthetic fabrics
Dressing in more versatile pieces that are good quality Vs having a style that changes with the trends
Barely there make up / a full face of make up designed to look like they're not wearing much Vs prominent make up
Untanned or lightly tanned skin Vs heavy fake tan
Whatever their preferred sense of style is tends to be mixed with good quality basics, rather than being driven by the trends and fast fashion.