According to The Economic Times, platinum, in general, has a low resale value. The main reason is that a relatively small number of people are willing to buy it. This doesn't mean you can't find a reputable buyer, but you'll need to do some searching as you explore your options. Platinum has a good resale value.
Platinum is an excellent material for setting diamonds because it grips diamonds better and is malleable enough to hold stones well. Platinum maintains its value over the years and is a strong and durable metal. Platinum together with diamonds is a very good mix for jewelry.