Aquamarine (Shigar Valley, Pakistan) Garnet (January) and they rely on a

and they rely on a build in electrical sensor called ampullae of Lorenzini

Faden Quartz occurs when Quartz crystals grow in a fault zone

Emeralds are graded by the eye

Crystalline Gold is much more valuable than the gold market's price value and at least 2 times that of a gold nugget due to its value as an extremely rare mineral specimen

and White Quartz

Aquamarine (Shigar Valley, Pakistan) Garnet (January) and they rely on aAquamarine is a light blue variety of beryl with hints of green. The blue color comes from the presence of ferrous iron, and without it or another impurity, beryl would be clear. Other noteworthy types of beryl include emerald, heliodor, and morganite. The name Aquamarine translates as you might expect, aqua marina meaning "water of the sea" in Latin. It is a highly sought after mineral that is most often cut and faceted to use as gemstone in jewelry.