Question: what are most expensive gemstones?
Answer: Tanzanite. $1,200 per carat. ...  Black Opal—$9,500 per carat. Dark and mysterious, the black opal is very different to its lighter, white and fiery sibling. ...  Red Beryl. $10,000 per carat. ...  Musgravite. $35,000 per carat. ...  Alexandrite. $70,000 per carat. ...  Emerald. ...  Ruby—$1.18 million per carat. ...  Pink Diamond—$1.19 million per carat.