As used in this chapter, the following terms shall have the meanings indicated:
Any person, partnership or corporation who or which, through any means, buys or sells secondhand gold, silver, precious metals or jewelry, and includes anyone advertising the purchase or sale of any of the aforementioned items.
Only those items of genuine quality, and shall exclude those items commonly known as "costume" or "fashion jewelry."
Any person under the age of 18 years.
Any item enumerated herein that is not new.