Pendant Wand Green Serpentine or Moss Agate Sterling Silver Box Chain 925 KAY

Stunning wand pendant in a green stone - it may be serpentine, moss agate or something else - I really don't know. Rich green color with white veining. Wand is 2" long, or 2.5" with the loop. Box chain is stamped 925 KAY so I assume it's from Kay Jewelers. It's 29" long and weighs about 6 grams. I do not know if the pendant's setting is sterling or not. I suspect this is not the chain it originally came with. Lovely condition.