This little old button showed up when our button club talked about “cobalt blue” glass buttons. It looked like a paperweight, but it is not, because it does not have the decorative “set-up”. (See below the glossary definition of the “set-up” in the paperweight.)
It is, instead, a “stratified” white button!
Its color is classified as white by NBS, because the color of a glass button is “judged by the base/back of the button”.
7-4.2–Coronet/color stratified. Div I. A top “crowns” a base, typically of a different
color. More substantial than overlay, it includes buttons with separately molded pieces of
glass joined with heat (fused), as well as those with distinct color layers molded as a single unit. […]
7-4.13–Paperweight. Div. I. Made by fusing together a base, set-up and a cap (threepart) or a set-up and cap (two-part). The set-up is independently made, decorative in
nature, and may appear on top of the base, “float” or form the base. The shank area or
base determines the color and opacity or transparency. […]
National Button Society Blue Book (NBS member resource)
The above is based on the National Button Society's Classification System.
WRBA Button Album encourages discussions across various button groups, in-person or online. Please reach out to us with additional information or suggestions.