Lobster Claw Clasp - a clasp that looks just like what the name implies. The lobster claw clasp is a very strong and very secure clasp. They are used on chains, bracelets and anklets and are available in yellow and white gold, platinum and silver.
Loupe - a jeweler's magnifying device used to view gemstones or their settings. 10x magnification is the industry standard.
Luster - the characteristic reflective property of a gemstone's surface.