Any person, firm, corporation or association, and any agent or employee thereof, who or which shall knowingly sell or offer for sale any diamond which shall have been artificially colored or tinted by coating, irradiating, heating, nuclear bombardment or by any other means, without disclosing in writing to the purchaser, or prospective purchaser, that such diamond has been artificially colored or tinted, or without disclosing in writing that the artificial coloring or tinting of such diamond is not permanent, if that be the fact, shall be guilty of a misdemeanor.
New York Legal Code