third quarter 19th century, presenting rose cut diamonds and fine Australian opal cabochons, 18 in. L., set in unmarked mixed-karat gold and silver, 47 grams

Comments added on 2/3/15: The diameter x depth of central opal cabochon, plus one of the largest opal drops are approximately 1/2" x 1/4". The length and width of the rose cut diamonds in central cluster are approximately 1/4" x 3/6" and cannot tell the depth. The color and clarity of the diamonds facing up are mine cut, O-P-R. Yes, the necklace moves well and sits well upon the neck. Excellent condition.