Changes create greater purchasing flexibility for non-Sightholders.
Customer demand and prices increase in 2013 with 31.2m carats mined.
New adverts showcases raw stones to raise consumer awareness of gems.
Event with 60 dealers will take place at same time as BaselWorld.
Latest Rapaport report says outlook for festive period is mixed.
Company's new $35m facility hopes to establish diamond hub in Africa.
Show welcomes 42,000 visitors; toasts young design talents.