Rebecca Earrings & Necklace Sterling 18k Bronze

Iconic jewelry designer Rebecca beautiful set I purchased outside US. Statement earrings with long necklace. Over time there is some staining from the natural materials on the sparkling silver part. See picture of darkening spots. It is made with 18K, bronze and sterling silver. I paid 446.00 without taxes over 20 years ago. Will polish before shipping. Authentication tags, brochure and boxes included . I have original invoice but will need to cut out personal information.