They knew what they were doing when they named this huge residential, business and school site in Unit 10 “Los Diamantes,” because that’s Spanish for diamonds and this is development could be a crown jewel for Rio Rancho. It’s been an enormous task to take this 170-acre site, termed “Unit 10” since Rio Rancho Estates was formulated, and have it start to come alive with an elementary school, almost 500 homes and a 38-acre business park.