Paid $22 at my favorite thrift shop

I picked this up at my favorite thrift do for $22. Am the gems are super cool. Am ex jeweler who was a customer said the red was coral, the black was either black Onix or obsidian. The rest I’m not sure. All interchangeable. Has some makers marks. Some say “A” and some show “RNM”. They all say 925 as well which is nice. Super neat imo. Thought you all would enjoy