Sterling Silver Green Amber Celtic Knot Round Ring Market value of amber is approximately the same as silver and price for finished piece of jewelry calculated by total weight of the product. Some bright colors of amber, which we have decided to offer you, such as blue, green, purple, green, red, pink have a special coating. The bottom of a gemstone is covered with waterproof varnish, though at very frequent contact with water or mechanical action it can acquire a different hue