A diamond ring from Zameer Kassan Fine Jewelry.

The diamond industry is facing a period of consolidation, but one upstart jeweler is steadily carving out a reputation for himself in a sector that's becoming less dominated by major jewelry producers.

In 2012, Zameer Kassam, a former McKinsey analyst with a family background in jewelry, made the leap from the business world into jewelry design. Armed with a Harvard MBA, Kassam told CNBC his business model is "the complete opposite of opposite of everything in the industry," and hinges on millenials — currently the hottest demographic in business.