Harvesting Ambition's Investiture

[Trusk'our he/him]

We've seen in Stormlight that a Cognitive Shadow with decay and travel to the Beyond when captured in a polestone, so if you used a Raysium dagger with a Perfect Gemstone to capture a Shade, would the Cognitive Shadow fade away and leave you with a Gemstone of Ambition's Investiture?

[Quantus he/him]

We cant really say for sure, since we don't know how Shades work, and Cognitive Shadow is a pretty category.  That Cognitive Shadow passed to Beyond because it was being sustained by an external Connection (the Oathpact) and the gem prison cut them off from it.  A Spren (which is very similar to a CS in most respects) doesnt have that problem, and there's at least one more that was (apparently) infused with enough Investiture to just persist on its own, so that one might be ok with a gem prison.