This is a teardrop shaped lab ruby weighing 20 ct and measuring 24.1 x 13.9mm. I cut this one myself in my newly updated 'Bloody Tear' design.
This ruby was grown by the Czochralski method, an advanced growth technique that produces more perfect crystals with purer chemistry than the typical stones used in jewelry. This one is likely codoped with a little bit of iron to give it a more pure red-red color vs the slightly magenta-red of a pure chromium ruby. I don't know for sure what this was grown for but it was likely a technical application like high end watch cases.
