Black and Blue

Mom passed over to the other side in 2001 and I wasn't ready until now to go through about 12 large tubs she left for me. I'm at number 3, well actually 2 and 1/2. I'm finding all kinds of coolio neat stuff, like this this Clear Crystal, Gold and what I thought was Black Glass, turns out to be very dark Blue. This needs to go to the Jeweler for cleaning and I am curious to find out about the Blue Stones. Could it be Cobalt or Saphire? I really hadn't noticed they were Blue until I had it next to an Onyx and Gold Necklace. It is strung with a fine silver chain that can be seen through the crystals. This Necklace is beautiful as each Crystal reflects the light like a prism and the blue color is really striking.