A diamond and boulder opal pendant

A diamond and boulder opal pendant <BR> The oval boulder opal, <I>weighing approximately 37.35 carats</I>, to a brilliant-cut diamond line surround with pierced reverse, to the pavé-set brilliant-cut diamond pendant loop, mounted in 18ct white gold, <I>London hallmark, 5.3cm long</I><BR> <I>Accompanied by report no. 04870 dated 18th November 2011 from The Gem & Pearl Laboratory, London, stating that the boulder opal is natural, in its own matrix</I> <BR>