Vintage sterling malachite necklace half moon With Jade beads

Vintage malachite necklace with sterling silver clasp the pendant we are not sure if sterling or brass. the beads appear to be a jade species. it is a stunning unique necklace; ther is a little dent at the back of the pendant. pendant 56x50 mm 30” beads plus pendant. preowned. Item is valued for its uniqness and quality. We are not sure of the composition. J227