Population studies paint a dismal picture of the mental health status of adolescents, in the US and worldwide. Positive psychology, which takes a preventative approach to keeping individuals in higher states of well-being, is being implemented increasingly among youth, with the goal of avoiding future mental health and psychological problems. In this study, a novel intervention, which fused the practice of meditation with gratitude visualizations, was tested among adolescents. The purpose of this quasi-experimental study was to determine the extent to which the intervention affected life satisfaction, school satisfaction, and measured gratitude, among a culturally diverse cohort of adolescents. Instrumentation consisted of three positive psychology measures—the Student Life Satisfaction Scale, the School Satisfaction Subscale, and the Gratitude Questionnaire-Six-Item Form. Participants were randomly assigned either to the delayed-intervention, no-treatment control group or to the experimental group. The four-week intervention was manualized primarily from the heart-centered gratitude visualizations outlined in a happiness and positive emotions handbook, The Jewels of Happiness: Inspiration and Wisdom to Guide Your Life-Journey. The intervention significantly affected life satisfaction, school satisfaction, and gratitude of the experimental group, when compared to the control group. Medium to large effect sizes were detected using the ANCOVA statistical test.