A prison ring is a type of plastic jewelry fashioned by hand in prisons, by working scrap plastic material, commonly celluloid items such as a toothbrush or a pen. Celluloid was historically a popular material since it could be heat bonded and glues were often less available. A common feature of prison rings were small photos mounted on the bezel.
- Leigh Leshner (28 February 2011). Collecting Art Plastic Jewelry: Identification and Price Guide. Krause Publications. pp. 9–. ISBN 978-1-4402-2751-6. Retrieved 26 August 2012.
- Grasso, Tony (1996). Bakelite Jewellery A Collector's guide. The Apple Press. pp. 94–98. ISBN 1850766134.
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