Hi - Diamond stud earrings are the most versatile item in a woman’s jewellery wardrobe. They are suitable for all occasions and look fine wearing as part of a casual outfit, with a little black dress, or for a formal event.
Also less chance of little fingers pulling them off like could happen with a pendant.
Good luck.
Check out Lightbox jewelry for lab diamond pendants and earrings under $1.5k! Costco is great too! You could also get her a designer purse (if you know what she would like) or home made "gift certificates" including one for a weekend getaway.