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The phenomenon of widespread genetic ancestry testing has raised questions about its social impact, particularly on issues of race. Some accounts suggest testing can promote bridging social capital – connections between racial groups. In this multi-method paper, we ask whether (1) taking genetic ancestry tests (GATs) and (2) receiving results of African, Asian, or Native American ancestry increases network racial diversity for White Americans. We use a randomized controlled trial of 802 White, non-Hispanic Americans, half of whom received GATs. Unexpected findings show that test-takers' network racial diversity decreases after testing. Using 58 follow-up interviews, we develop and test a possible theory, finding initial evidence that test-takers' network racial diversity declines because they reconsider their racial appraisals of others in their networks. [ABSTRACT FROM AUTHOR]