If you think that will increase their appeal then you don't truly understand why diamonds are valuable. It's what they represent.

The princess doesn't want a gem on her finger that has been cultivated by a nerd and comes with a "vegan, soy-based, cruelty free" approval on it. She wants a warlord to return from conquering and pillaging foreign lands, leaving rivers of blood in his wake, to deliver the prize to his queen as a symbol of her value and his material investment and dedication to her.

Obviously no woman in her right mind is consciously thinking that, but that's the psychology behind it. "Bloodless" is icky.

I don't think you've been associating with the kinds of princesses that I have been.

Where do you find princesses anymore? Sweden?

They used to flock about Jarvis Cocker, the Sloane Rangers and Chelsea Daggers.

There's a London pub nicknamed the Sloaney Pony; maybe try there?

If you'd only read your Daily Mail or Tatler, you'd know to find Princess Gabriella in Monaco.

As far as reigning-house europeans go:

  Princess Elisabeth
  Princess Eléonore
  Princess Isabella
  Princess Josephine
  Princess Marie-Caroline
  Princess Amalia
  Princess Gabriella
  Princess Catharina-Amalia
  Princess Alexia
  Princess Ariane
  Princess Ingrid
  Infanta Leonor
  Infanta Sofía
  Princess Estelle
  Princess Adrienne
  Princess Charlotte
  Princess Lilibet

At press time, Princess Peach was in another castle.

Lagniappe: https://www.youtube.com/watch?v=-TQmo5TvZQY