This is the kind of piece that, had I a spare few thousand, I’d plunk it right down on this item.
From Sorellina, it’s described as a, “carved blue lace agate locket with 18K yellow gold and pave white diamond hummingbird. Chain sold separately. 36.28ct blue lace agate; 0.40cttw G-H/SI2 diamonds; 15g.”
This sells for USD$3,400.