Click image to Enlarge 3mm Heavy Duty Solid Diamond Cut Rope Chain Necklace Extender  10K Yellow Gold Metal Condition Finish Avg. Weight        Width Length Clasp Retail Price Real 10K Yellow Gold (Stamped 10K)  Brand New Polished 2.60 grams (for a 4" extender) 3mm= 1/8" Selectable from the drop-down menu above, from 1" to 8" Lobster Claw Clasp $464 * Thinner or Thicker versions are also listed in our store. The picture shows a 2" = 50mm extender.