This is a turquoise necklace by Michal Negrin. It was mostly just tried on and then put away. I believe the metal discoloration is minimal. ●Comment: This is a globally renowned brand by an Israeli designer of costume jewelry. It is a globally renowned brand by an Israeli designer of jewelry. Many designs are Victorian-inspired, featuring motifs like roses and angels, creating an antique and elegant atmosphere. The materials are brass-based, with options including lace and crystal glass, offering both glamorous and chic pieces. Depending on the shape and fit, it can be stylish for any occasion, from formal to casual. If you are looking for something like this, please consider it☆