Krementz & Co., the Newark, New Jersey, jewelry manufacturer, made costume jewelry and upscale gold jewelry for stores, including Tiffany & Co. Much was unmarked. They also made “gold overlay” costume jewelry from the early 1900s to 1969. Most of that was marked. The great-grandson of the founder gave designs, cost books and photographs from 1864 to 1969 to the Newark Museum archives. Another donor added 40 scrapbooks of ads from the 1890s to 1970s, patents, trade catalogs, pamphlets, photographs and books. The archives is available for researchers. The ability to identify pieces by Krementz should add to today’s prices for both costume and upscale pins, bracelets, necklaces, gold mesh purses, cufflinks and other accessories.