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.
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
There are also nicer artificial sapphires which are grown in similar conditions as natural ones. These have inclusions similar to natural ones, but they are usually uniform in color. Natural ones tend to have parts that are more saturated. It's not a technical limitation though, so I'm sure you can make less perfect-looking artificial sapphires that can fool your average jeweler. However, gemological testing will use advanced spectroscopy, which spits out enough data to distinguish between natural and artificial ones.