Vintage Silver Link Necklace Black Triangle Pendant with Crystal Etched Gothic Deco

Pretty and unique necklace with textured bar links, black triangle pendant with etched silver designs flowing over it and a crystal.
End loop or ring is stamped CAL and a 3 digit number that’s hard to make out. I’m guessing 925 but it could be 800 or ? It definitely looks to be real silver to me and you could polish it if you’d like it shinier. I love its current look.
I don’t know what the black is made of. Could be onyx, could be glass.
Each bar link is .75”
Length is 17”
Pendant is about 1.5” x 1”