Would it make sense to fund Mars missions by bringing back gemstones found on Mars?

We know that Mars has gemstones, opals, peridot, etc.

The whole diamond industry is built off of inflating the prices of diamonds and marketing them to people to make them think they are worth something.

You could put a price on Martian gems for a couple hundreds thousands or millions a kilo, have them be some super uber luxury product, bring them back from Mars on a cargo starship and boom, that can fund long term space and Mars missions.