As per Watchbatterybuyers.com, you can expect to get paid $15 to $30 per pound of rolled gold plate (RGP), according to the grade of the material; and sometimes more.
Since an item that is marked RGP has less than 1/60th of its weight made up of the marked gold, then an 18K-RGP only has 1.25% pure gold. Price will depend on the kind of jewelry. To give you an idea here are some items that are made from 18krgp:
Attractive Shiny Plated 18krgp Printed 5mm Gold Chain - US $5.27 to US $6.42 per piece
Crystal Heart Necklace in Gift Box (18KRGP) - US $3.16 per piece
18KRGP crystal designer rings 2014 wholesale - US $3.99 per piece
Rolled Gold Plate items, again, are "more valuable" when they are non-magnetic. Magnetic gold-filled items are based on stainless steel, which is much more difficult to refine. Therefore, always carry a magnet.
Please note that financial services provider such as Money Mart do not purchase gold plated (GP), gold-filled (GF) rolled gold plated (RGP) or gold shell (GS) marked items. As gold pieces that are gold plated, gold filled, gold shelled or rolled gold plated items do not have any value because they do not have any real karat weight except on the filing or plating.
One of the main uses for gold is Jewelry. When buying a gold necklace, a pair of earrings, a bracelet or ring you really need to look at the gold content in what you’re buying and think about what this jewelry will be used for.
Check out some tips on how to understand the meaning of gold hallmarks at Jewelry-auctioned.com.
Jewelry scams are popular throughout the world now, so never act like this is your first time in a jewelry store. Here's how to buy jewelry like a jeweler shared by Vice.com.