Golden Gemstone (also known as Gold Rock in the SNES/PS version) is an accessory in Chrono Trigger. Enabling Marle, Frog, and Robo to use the Triple Tech Master Mune, this gem is acquired in Denadoro Mountains after powering up the Masamune. Select Frog as the leading party member and scale the mountain. When the Free Lancer throws an object at the party, Frog will catch the Golden Gemstone. Once the party has learned Arise, Frog Squash, and Cure Beam, respectively, equip Frog this item to perform the tech in battle.
This gemstone is gold-colored, likely resembling topaz or citrine.