Agate is less rare than emeralds but no less beautiful—the semi-precious stone has been prized for ... but shades of blue and green are sometimes also observed." Related: People Born in March ...

Known for its deep red hue, rubies are highly prized and valued at around $4,625 per carat. One of the hardest and most sought-after gemstones, diamonds cost approximately $9,502.13 per carat. A light ...