About six months ago, before finding you, I purchase a Tahitian Baroque Necklace from a reputable jeweler in Canada. It is 18' in totoal, pearls diameter 11.00 to 13.5mm with an 18Kt whitegold with diamonds clasp. No mention of grade but appears to be relatively free of blemishes. The pearls are relatively round. What is a reasonable price for this necklace?