Heartseeker Weapon Gems?

I’ve seen some builds online using Topaz and I’ve seen some builds using Sapphires (and the builds are very similar). Then I see people in-game using Emeralds with Heartseeker.

Which gem should you really use for Heartseeker builds?

The advice I saw was you should run vulnerable until you hit around the 1500% mark, then use the basic attack gems.

They’re very similar in performance at the end of the day, the margin of difference is a fraction of 1% so you can really use either gem (sapphire or topaz).