You could either take it to an antique store near by or sell it on ebay. I'd suggest researching what the dress originally sells for and if anyone else is selling the same dress and for what price.
Try ebay.......
VCLM jewelry is vintage pieces of costume jewelry with a specific marking of "VCLM." They are created by the vintage jewelry company VCLM.
"Avon jewelry may not be as pricey and sumptious as other jewelry; vintage pieces are known to sell for $25-$45; but if you are a costume jewel enthusiast, Avon may appeal to you."
Topaz Jewelry, DH Gate, Glitzy Jewels and Amalaan Jewels are some of the stores which sell wholesale costume jewelry online. Apart from these stores, costume jewelries can be bought in low prices at estate auctions and flea markets.
There are online shops that sell vintage jewelry. A good example would be auction sites like eBay, where people sell used jewelry. Many local jewelers and second-hand shops also sell vintage jewelry.
It depends on the type of vintage jewelry that you're trying to sell since various types of jewelry have varying values which fluctuate depending on market demand. To best asses the price you should get it appraised by an accredited appraiser who can will give you the current value for your jewelry pieces and an accurate idea of the cost you'll be able to sell them for.
pawn shop, EBAY.com or Retrophoria.com
There are many online shops that sell vintage jewelry. Amazon.com is one of online shop that sells vintage jewelry with any kind of models. You can visit www.amazon.com
Cheap costume jewelry can be found in dollar stores, thrift shops, discount jewelry stores, and even garage sales. Craft stores sell materials to make your own and school or church sponsored fund raising craft fairs are additional resources.
Walmart sells all kinds of jewelry, from cheap costume jewelry to more expensive jewelry made from fine metals and gemstones. They even sell wedding and engagement jewelry.
RMN is the trademark of The Roman Company. You most likely have costume jewelry or a replica of gold or silver jewelry. It isn't real gold or silver but it is a good knock off.
There is not a way to get the color back in costume jewelry. The jewelry on the costume is not real.
Jewelry stores deal in expensive watches, as well as the more purely ornamental types of jewelry. You can see if a jewelry store might wish to buy your vintage Rolex.