When working with colored gemstones and diamonds, today more than ever, it is essential to be able to have your gemstones independently evaluated. The International Colored Gemstone Laboratory understands this and offers a range of services directly suited to the practical jewelry business. ICL checks every gemstone using state of the art equipment to establish what gemstone has been submitted, whether it has been enhanced in any way, where it comes from, it’s purity and how well it has been cut.