Overall view of the aft (active) side of the Gemini heatshield subjected to
reentry-type temperatures. See the NASM collection ID #A19781814000
page, which notes that this heatshield "may have been installed on Gemini 2").
As seems to be common, a number of cores have been removed from the heatshield
(which are even more obvious from the opposite
side), some of which have been replaced with similarly-colored cores
(although there are still some empty holes).
To see what a Gemini heatshield looks like after a core has been removed, see
this photo on Gemini 12 at Adler Planetarium.