Robin Thicke Gets Stoned

6/11/2014 12:08 PM PDT

Robin Thicke Gets Stoned

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Robin Thicke re-upped his chakra security after visiting a gem store this week ... picking up a jumbo-sized crystal used for protection.

The singer dropped by Crystalarium in West Hollywood with 4-year-old son Julian Tuesday and snagged a 2 foot high chunk of Amethyst.

Spiritual sources tell us ... Thicke spent a few thousand bucks on the stone -- which is used for purification and protection ... as well as getting in touch with the higher consciousness.

Thicke has been making a full-court press to get back with wife Paula Patton.  Rock on, dude.