Hey, Normally we know that Costume jewelry means which are made as per our costumes. In another way, it is made up of inexpensive gemstones, such as Lucite, silver, nickel or brass. But Now a day Modern costume jewelry incorporates a wide range of materials like crystals, diamonds, and some semi-precious stones. Recently I bought some amber stone, which is also a semi precious gemstone from "Drfinejewels.com" and use those for making a bracelet. Really, it is a good site by providing a variety of stones.