Named for the northern lights, aurora borealis is a term for crystal stones that have a highly iridescent surface. The effect is achieved by vapor blasting the facets of the lower part of the crystals with an invisible, micro thin metal sheet. Often abbreviated to AB, the term now refers to any highly iridescent surface.

Tin is a pure metallic element, listed on the periodic table as Sn (an abbreviation of Stannum, which is Latin for tin). Tin resists oxidization and corrosion, so it is commonly used in metal jewelry components. Tin is found in alloys such as bronze (a mix of copper and tin) or genuine pewter (a mix of tin with copper, antimony and lead). Tin is also used as an anti-corrosion coating over steel, in solder and in some batteries.

Learn the three-letter codes Fire Mountain Gems and Beads uses to identify the finishes on metal products with this handy chart.

Easy-to-read and comprehensive guide to the names and properties of the metals most commonly used in jewelry designs and components.

This invaluable chart explains the abbreviations used by Fire Mountain Gems to designate treated or enhanced gemstones.