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George L. Paine Co. was only in business from 1909 until 1922, so this brooch is fairly easily dated and it's style is easily Edwardian or Art Nouveau.
Measuring just under 2 inches long and 3/4 inches wide this piece is a stunner. The pin does not open as widely as modern pins do, only opening to about a 45 degree angle. The stone moves in the setting when touched , however it is still very secure and I would wear it with confidence.
I do not know if it is real gold or not, nor am I an expert jewelry to be able to identify if its a genuine amethyst.