I use a basic silver or bronze chain 2.4mm, see the link below :) Also, the stained glass I use is 1/8th thick. www.amazon.com/Tiparts-Stainless-Necklace-Connectors-connectors/dp/B07HT1TCRR/ref=asc_df_B07HT1TCRR?tag=bingshoppinga-20&linkCode=df0&hvadid=79920803698754&hvnetw=o&hvqmt=e&hvbmt=be&hvdev=c&hvlocint=&hvlocphy=&hvtargid=pla-4583520382344594&th=1
Hi Minnie! Thanks for watching :) I use a basic tacky glue. You can find it at Michael's. Also, if you're going to put your mosaic rock outdoors i recommend sealing it with a grout sealer which you can find at any hardware store that has a tile section. Best to you in your artistic endeavors!