GEMSTONE Trademark of Gemstone Foods, LLC. Serial Number
Soak the cracked emerald in acetone and make sure any oils are cleaned from the crack.
From what I've heard that the serial number data for Edison has been largely thrown to the wind.
A gem which is cracked, fissured, devoid of luster, or appearing rough or sandy, should not be used at all.” AGNI-PURANAM: Chapter 246, Verse 7 & 8