Federal law requires that gold jewelry sold in the United States must be marked with the gold content. The U.S. jewelry industry has standardized the marking of real gold items through Voluntary Product Standard PS 68-76.
The marking indicates the gold content and “CRP” does not fit any of the standard marking, so it’s probably an abbreviation of the jewelry manufacturer; “CRP” by CRP JEWELLERY (THAILAND) LIMITED.
Karat Markings - marked with the number followed by a letter K . The mark -- for instance, “14K” -- typically is stamped on a place that doesn’t show when the jewelry is worn.
Gold Content - a piece of gold alloy jewelry marked 10K contains 41.67 percent gold, a 12K item is 50 percent gold, a 14K piece contains 58.33 percent gold, an 18K item contains 75 percent gold, and a 22K item contains 91.67 percent gold.
Gold Filled - “gold filled” or GF, “gold overlay” or GO, or “rolled gold plate” or RGP, is made of a base metal such as copper or nickel that has had a heavy coat of 10, 12 or 14 karat gold alloy bonded to it through a mechanical hot rolling process.
Gold Plated - is made of a base metal such as copper that has been thinly coated with 10, 12 or 14 karat gold alloy through a mechanical or electrical plating process. A jewelry item can be sold as “gold plated” or GP if the gold alloy plating is at least 20 micro-inches thick. Such an item could be marked as “14K GP.”
Gold jewelry never goes out of style, and for good reason, because gold is as wearer-friendly as it is beautiful. Check out some tips on how to buy gold at About.com.