Thanks so much! May I ask, does your heart necklace also have any T&Co. or 18k/750 or PT/950 markings? The earrings (based on the few pics) didn't have anything other than "Thailand" and the blue velvet box, which would seem to make it very difficult to authenticate unless the stones are laser inscribed and you do a scratch/chemical test for metal purity. I get that Tiffany manufactures some products overseas to lower its costs, but wouldn't they want their brand marked on them as well? Also seems it would be much easier to "fake" these items that lack Tiffany hallmarks, IMHO.
Yes, it has the Tiffany and the PT/950 markings. I can't remember if it says "Tiffany" or "T&Co.".