AU Cornerstone uses only the highest quality materials from metal alloys to colored stones and diamonds. All metal is purchased from United Precious Metals to insure quality and correct alloy content. NATURAL NUGGETS: Natural gold nuggets from the Alaskan Yukon, no two nuggets are exactly alike. GOLD QUARTZ: Each piece of gold quartz is one of a kind, hand cut and polished, and brought to you in many unique designs. OPAL: Opal is the finest in natural or gilson opal, your choice.
