Krementz jewelry was established in 1866. Originally their pieces were made of 14K gold. Later, during the 1880's they begin the thick rolled gold plating giving costume pieces the look of fine jewelry.
They were known for their cufflinks and collar buttons and later, during the 1930's, they expanded into women's costume jewelry. During the Great Depression costume jewelry was in greater demand as many could no longer afford fine jewelry. The rolled gold overlay is a base metal between two thick layers of gold and fused.
Besides their Art Deco cufflinks, some of the more highly sought after pieces are the ones with roses, as shown above.
I just added a couple of pairs of very detailed guilloche art deco cufflinks from Krementz here .
And, here is a video I made showing many different vintage cufflinks: