. "Jak II skull gem locations Requirements Trophy type This page lists the locations of all ~570 skull gems in Jak II. A skull gem is a glowing yellow gem obtained from killing metal heads. Collecting skull gems is related to trophies titled \"Head Over Heels\", \"Head Cheese\", and \"Head Master\". Collecting 50, 250, and 510 skull gems unlocks a bronze, silver, and gold trophy, respectively."@en . . . "Silver"@en . . "Jak II skull gem locations"@en . "Gold"@en . "Bronze"@en . . . "Collect 250 skull gems"@en . "Collect 510 skull gems"@en . "Collect 50 skull gems"@en . . "Jak II skull gem locations Requirements Trophy type This page lists the locations of all ~570 skull gems in Jak II. A skull gem is a glowing yellow gem obtained from killing metal heads. Collecting skull gems is related to trophies titled \"Head Over Heels\", \"Head Cheese\", and \"Head Master\". Collecting 50, 250, and 510 skull gems unlocks a bronze, silver, and gold trophy, respectively."@en .