3mm Heavy Duty Solid Diamond Cut Rope Chain Necklace Extender  14K Yellow Gold Metal Condition Finish Avg. Weight        Width Length Clasp Retail Price Real 14K Yellow Gold (Stamped 14K)  Brand New Polished 2.80 grams (for a 4" extender) 3mm= 1/8" Selectable from the drop-down menu above, from 1" to 8" Pear Lobster Claw Clasp $564 * Thinner or Thicker versions are also listed in our store. The picture shows a 2" = 50mm extender.