Most people associate aquamarines with the color blue, but many are sea green and almost all aquamarine in its natural state has some green in it. Ferric iron is responsible for the hue, so the stones are usually heat-treated, which eliminates the green and leaves a rich, blue tone. When it comes to aquamarines, tone is a major factor in price, with dark, but not too dark, blues fetching the highest prices.
Interestingly, blue has not always been the preferred color for aquamarine. Victorian Era jewelers produced rings, earrings, and necklaces using aquamarines that were greenish. More recently, in the 1980s, blue was actually the stone’s liability, as the atomic structure of colorless topaz was altered in a linear accelerator to produce a cheap alternative to true aquamarine, thus temporarily depressing the gem’s value.


Antique Aquamarine and gold brooch?
This piece is marked "Loran Sim&…









