Yes… that’s what I said… the extra gem will be the same colour as the gem in the hero’s helm… not the follower’s helm.
I assume you are referring to your hero “Jitters”…
The enchantress follower is wearing the Broken Crown and the hero is wearing a ruby in its helm:
The Broken Crown power is:
Whenever a gem drops, a gem of the type socketed into your helmet also drops. This effect does not apply to Legendary Gems. (Emanates)
Notice how it says “Emanates” at the end… that means that the power will apply to the hero, not the follower. So… whenever a gem drops, a gem of the type socketed in the helmet of the hero (in this case, a ruby) will also drop.
I hope this makes it more clear…