Vintage Kohn & Son's Necklace w/ Diamonds in PlatinumVintage Kohn Sons Necklace w Diamonds in Platinum. This detailed and delicate Edwardian diamond necklace was made by famed New York jeweler Theodore A. Kohn. The intricate detail in the metal is added to by the hanging diamonds that provide great movement and sparkle. This is a lovely design from an era marked by its use of ornamental wire work done in platinum