A variety of factors determine the value of a piece of jewellery. For one, gold is sold by weight, and heavier pieces can be more costly than lighter ones. Designer jewellery also generally costs more, especially if it’s a one-of-a-kind piece. Special finishes, such as matte or sandblasted, may also affect the cost of the piece. If gemstones are included in the piece, the type of gemstone and quality of the gemstone can also affect the pricing of the item.