On Christ the solid rock on which I stand... The Rock Necklace is sterling silver and comes on a 16-inch chain. If you prefer to wear your necklace a bit longer, select 18, 20, or 24 inches for a small additional fee. It contains four round pebble beads that measure approximately 8mm in diameter and a center oval pendant with a cross cut out of the middle. The center pendant measures approximately 5/8 inches in length and 3/8 inches wide. The Rock Necklace is a small reminder that our Rock is solid ~ all else is sinking sand. Metal: .925...