Bakelite mourning ring Prison ring

"prison ring" or "mourning ring" from the 1920s to the 1940s.
Here's more information about this type of ring:
Material: These rings were typically made from early plastics like Bakelite or celluloid.
Origin & Purpose: Often called "prison rings" because they were sometimes fashioned by hand in prisons, potentially from scrap materials like celluloid items (e.g., toothbrushes, combs, pens) to keep photos of loved ones close or as a symbol of mourning during wartime or separation.
Sentimental Value: They served as a tangible link to a cherished person, whether for memorial, romantic, or familial reasons, becoming a significant piece of sentimental jewelry for the wearer.
Not sure of the material... Could be celluloid or bakelite
They are quite collectable and hard to find ... Add one to your collection at a great price!