Siam Sterling jewelry was manufactured from the 1930s through the 1980s, and was a very popular motif in the 1950-60s. Although Siam officially changed its name to Thailand in the 1940s, the “Siam” nickname for this style of jewelry stuck.
Siam silver is officially called “Nielloware.” Niello is a black mixture of copper, silver, and lead, used as an inlay on engraved or etched metal. American soldiers who visited Thailand in the mid-20th century bought this jewelry for their ladies back home, making it a popular mid-century trend. Much of the filigree was etched by hand by Thai artisans.
Identifying Siam Sterling
Nielloware pieces are usually stamped “Siam” or “Niello” on the back. You will find common examples with figurals such as dancers or peacocks carved out of a black field. All Siam sterling is sterling silver and will usually have some type of black, white or occasionally colored enamel as part of the design. Only the black and silver pieces are considered Nielloware by collectors, and colored enamels fit into another category of Siam silver.
Most pieces aren’t worth a ton of money, but if you think you have something large or unusual, DO YOUR RESEARCH. Collectors of Siam sterling get very serious about unusual colors and large, rare pieces and will pay top dollar.