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Valuable gemstones

Isn’t it true that an 11ct. cut blue Sapphire gem sold for the price of $2.1 mil. and its color is a flat, dark blue, and its clarity is such that there’s no instrument in existence that can see through it. It seems to me this gem struck out swinging at sparkling beauty, and also the same with its amount of transparency. And, even I can see that the cut of this stone is nice but its not spectacular. What’s left that makes such a stone so highly valuable per carat ? Does anybody have a good, short answer ?
Tom C

There might be a story or provenance behind the stone.

It’s not about what they are worth it’s about what someone is willing to pay! Happens all the time with gemstones and art work! - Mike Acquire Collectibles IGS Certified Pro Gemologist.