March Birthstone, Aquamarine
Aquamarine is one of those gems that's not easy to find.
Sure, the birthstone jewelry at most jewelry counters will have aqua, but it tends to be pretty pale, or "washed out." Top quality aqua is not plentiful, and, with a high demand in Europe and the East for top quality met with a willingness to pay top dollar, that means the US doesn't often see beautiful examples of aqua.
Fine aqua is available but not in quantity so big stores usually won't have them because they have to have enough to supply all their stores with all the lines in enough quantity to meet the market and sales goals. Look to small, custom jewelers for this specimens of this gorgeous gemstone.