Found this one by randomly searching for Carnelian (stupid hard to find gem stone) and how have I never heard of this series?
Following Bram Stoker's sister and Sherlock Holmes' niece this reminds me slightly of the Stalking Jack the Ripper and Veronica Speedwell series'. Single, young women way ahead of their time solving murders....and killing vampires, of course, plus a little time travel? Hell yes!
Definitely picking up the rest of these