There are a few threads like this that I've posted on...but I'll put them here too
Emma=Suzy's Emerald Princess
Milli=Suzy's Million Dollar Sapphire
My birthstone is an emerald, and my mother's was/my husband's is a sapphire. Both stones are in my wedding band, so that's where I got their names from.
Emma wears everything pink (clothes, barrettes, harness, leash, etc.), since she's a princess. Milli wears everything in blue, since she's my sapphire.