Costume Jewelry Collectors Int’l LLC Logo

A Global Community of Costume Jewelry Enthusiasts

Costume Jewelry Collectors Int’l LLC (CJCI) is a global community dedicated to the study, enjoyment, and promotion of collectible costume jewelry. CJCI brings people together through conventions and social networking. We also fulfill our mission of sharing costume jewelry information and resources through our website free of charge.

CJCI does not operate as a non-profit entity, however, our online resources are made possible by generous donations from the collecting community. This includes keeping the RCJ Marks Guide online as well as hosting many other educational features pertaining to costume jewelry collecting. Many of these, in fact, have been contributed by our community members and we’re pleased to house their ardent research.

Since CJCI was founded in late 2009, seven weekend-long conventions have been held hosting attendees from around the globe. We no longer charge a membership fee but do encourage those who want to participate in future events to sign up for the CJCI mailing list through our website and to follow our page on Facebook. 

Due to the ongoing pandemic, we were not able to hold CJCI Convention 2020 as planned. It is our hope to reschedule the convention at a time in the future when it is safer for our community to travel and gather together again. The costume jewelry show and sale portion of the convention was hosted online by Ruby Lane in October, 2020.

We also invite you to visit the dealers linked below who supported CJCI by participating in the CJCI October Show & Sale online in 2020. For information on possible future CJCI online shows, email (


P.O. Box 446

Benicia, CA 94510

Pamela Siegel, Co-Founder