Gems on The Run (2013)

Three friends, Rith, Sovan, and Dara, made a pact as kids in the late 1990s: they would grow old together, working at a beachside restaurant. Life pulled them apart, but fifteen years later, Dara's death reunites Rith, now a police officer, and Sovan, who has become a gangster. Traveling through southern Cambodia, Sovan is secretly transporting $3 million worth of diamonds – a fact unknown to Rith.