These are set in 925 sterling silver. The chain is an 18cable, (width 1.2mm) 925 sterling silver. You may combine items for 7 days for $3.75 for the first item and free per additional item. You may combine as many items as you would like within the 7 day combining period. Please wait until you are finished shopping to combine all items.Darling sterling silver pure pink topaz marquise set genuine diamonds & gemstones i will send an invoice at the end of hte combining period unless you request one earlier. You may combine items for 7 days for $5.00 for the first item and free per additional item. You may combine items for 7 days for $7.00 for the first item and free per additional item. Plesae request a invoice when done shopping. Be sure to add me to your.