The Berlin iron antique jewellery: These are typically chunky with a coal black surface. They are characterized by intricate lacy and very delicate designs. They are a rarity and have become collectibles.
Cut steel antique jewellery: Cut steel was faceted and made into beads to imitate diamonds. The beads were then set into desired designs. This was alluring. At certain angles steel caught light and gave a remarkably brilliant shimmer. As they imitated diamonds, they served a similar purpose. They were used to grace shoe buckles, hair ornaments, necklaces, bracelets etc. This style was popular through the 18th and 19th centuries. Dame fashion however turned her back on these in the 20th century. The earlier pieces are more priced because of the better quality of workmanship.
There were other types that were labor intensive and more expensive. The Victorian Essex Crystal jewellery being a case in point.