I think the gift of discernment is a gift of the Holy Spirit, but there are counterfeits vvhere a person that isn't a born-again Christian (temple of the Holy Spirit) sees these things and "auras" and vvhat not. The counterfeit is not of God, but the enemy. It is not sourced from God. They mess vvith nevv age things and crystals. Say they've had the gift since they vvere a baby.
If they aren't a Christian, born again, and are operating in areas of the Spirit, you can be assured that their source should be in question. The glory doesn't go to God, but to self, as some innate ability. VVhere the gift of discernment is used by God through a person for the edification of others, the counterfeit gift exalts self. "I have this ability", more like some spirit does, just like palm readers and so on. Fortune tellers, all the same. A counterfeit of the reality that is found in God's Kingdom.
You as a believer operating in this gift gives credence to the idea that you have the gift of discernment, vvhich is a vvonderful tool in exhorting others and revealing things to others about themselves. Comforting and even discussing things for healing, emotionally or spiritually. As a non-believer operating in this area, that is sketchy area.