Hello Bari, You asked for a source of very thin sterling chain.
Rio Grande http://www.riogrande.com has a good selection of 1mm
diameter chains. Indian Jewelry Supply (1-800-545-6540) has a
lovely rounded box chain (1mm diameter) - my personal favorite. No
association with either company, etc. Judy in Kansas
Judy M. Willingham, R.S.
Biological and Agricultural Engineering
237 Seaton Hall
Kansas State University
Manhattan KS 66506