This document provides a case study analysis of DeBeers Diamond, including a PEST analysis and application of Michael Porter's 5 Forces model. The PEST analysis examines political, economic, social and technical factors affecting DeBeers. It outlines amendments to diamond laws in Africa, DeBeers' antitrust issues in the US, and instability in diamond-producing countries. The 5 Forces analysis ranks potential entrants as low, suppliers as high power, sightholders as medium power, buyers as medium power, and substitutes (synthetic diamonds) as a high threat to DeBeers' business model.