About Gemstone : Aquamarine
Aquamarine, latin for "Aqua Marina - Water of the Sea"
While the name is almost like a spell from RPG game, It is another beautiful beautiful Gem ( Yep, i wrote beautiful twice on purpose, not because i'm drinking something ), because it is beautiful, and hard to get man..
Aquamarine's mineral class is Beryl, just like Emerald, Morganite, and the list go on...
Hardness is around 7.5 - 8 in mohs scale.
in Comparation, those "anti scratch sapphire" is 9 in mohs scale.
Usually the color is blue ( it's named Water of the Sea, so yeah.. ), but the color is actually Blueish green, blue-green, greenish blue, and well.. blue.
The Chemical formula is Be3Al2Si6O18 + Fe
If you interested how to spell it ( or want to sound smart ), it's beryllium aluminium cyclosilicate + Fe ion.
Be careful though, many naughty seller sell light blue topaz or blue zircon as Aquamarine.
Although Light Blue Topaz or blue Zircon is also pretty, generally, it's cheaper than Aquamarine.
By the way, Aquamarine is the birthstone for people born in March.