I was going to create a wizard with the sailor background. Now the Sailor starting equipment in the PHB states that I get a lucky charm. Either a rabbit foot, small stone with a hole in it, or something from the trinkets table. I rolled a gemstone that looks like coal when inspected by someone else other than me. Also to mention that this gemstone does not specify a price.
Could this gemstone be a diamond?
Can I use this to cast chromatic orb?