Executive Order 6102 required all persons to deliver on or before May 1, 1933, all but a small amount of gold coin, gold bullion, and gold certificates owned by them to the Federal Reserve, in exchange for $20.67 (equivalent to $400 in 2018)[4] per troy ounce. Under the Trading with the Enemy Act of 1917, as amended by the recently passed Emergency Banking Act of March 9, 1933, violation of the order was punishable by fine up to $10,000 (equivalent to $194,000 in 2018)[4] or up to ten years in prison, or both.
Order 6102 specifically exempted "customary use in industry, profession or art", a provision that covered artists, jewelers, dentists, and sign makers among others. The order further permitted any person to own up to $100 in gold coins (a face value equivalent to 5 troy ounces (160 g) of gold valued at about $6,339 in 2016). The same paragraph also exempted "gold coins having recognized special value to collectors of rare and unusual coins". That protected recognized gold coin collections from legal seizure and likely melting.
The price of gold from the Treasury for international transactions was then raised by the Gold Reserve Act to $35 an ounce (equivalent to $677 in 2018)[4]. The resulting profit that the government realized funded the Exchange Stabilization Fund established by the Gold Reserve Act in 1934
from wikipedia