By Demetria Osei-Tutu This guest on Antiques Roadshow could not believe the appraised value of her grandmother-in-law’s 1910s pearl and diamond necklace. The rare and beautiful necklace was inherited by the couple when her husband’s grandmother died at the age of 102. The woman brought it in to appraiser Gloria Lieberman on the TV show. Gloria, who is one of the world’s renowned experts on antique jewelry according to her PBS bio, confirmed that the “very special piece” was most likely designed by Paulding Farnham during his 20 year stint as the lead designer at Tiffany & Co. For all the lates…