I could lose whole days wandering round the virtual shops in Etsy, and I've just found The Lola Collection, which is chock full of gorgeous glass encased pendants.
This vintage LA map is my favourite (although the Hello Blue bangle comes a close second) and the designer is happy to do custom map necklaces, so they'd make a great gift too. Particularly for just $55!
Related: The Wistful Republic Vintage Buttons | Murano glass pendant | Blend Creations' beautiful pendants