Sterling Silver Natural Opal and Sapphire Halo Pendant Necklace

Sterling silver necklace is signed 925 India and a maker's mark and features an approximately 7x5mm genuine natural Opal surrounded by Sapphires.  The pendant measures 3/4 inch, including the bail, by 3/8 inch wide.  It is on an 18 inch sterling silver chain and the weight of the necklace is 2.4 grams.  It is in great vintage condition.