Robert mines for  White Topaz crystals in the Tarryall Mtns which are near Lake George, Colorado.  Robert faceted one of those crystals into this 18x14mm pear shaped gem weighing 13 carats.  He then set the gem in a Sterling Silver Pendant.  
 
For this Pendant, we recommend a 20” or 24” Medium Reverse Rope Sterling Silver Chain, #1116.