This necklace was made with hematite beads.
From Semi-Precious Stone.Com:
"The iron content in magnetic hematite can help blood pressure disorders and kidney issues. It is said to be effective in healing pain because it maintains the charge of nerve cells. Magnetic hematite will also regulate the blood flow in the body."
(I am not perscribing or giving medical information. Hematite tends to have natural healing properties.)