Maybe, but realistically, most jewelry will have them inlaid in gold anyway, which is not hard at all. So you need to take care not to scratch it regardless of what gem is used.
Also, many other gems are harder then steel which is about the hardest thing your jewelry would come into contact with.
Diamonds do make sense as gemstones because of their hardness. They’ll stay scratch free for life. But ya, the diamond industry is garbage.
Maybe, but realistically, most jewelry will have them inlaid in gold anyway, which is not hard at all. So you need to take care not to scratch it regardless of what gem is used.
Also, many other gems are harder then steel which is about the hardest thing your jewelry would come into contact with.
So I would say the benefit is minor.
They’re too common to be truly valuable, though, and that’s before factoring in that you can just make them now.