Lab grown gemstones:Lab-created gemstones are those that are created in a laboratory, rather than being found in nature. Lapidary is the art and science of cutting and polishing gemstones. A lariat necklace is a necklace that hangs down from the neck, often with a pendant or charm at the end. A laser-inscribed gemstone is one that has had a design or message engraved onto it using a laser.