The Gemological Institute of America (GIA) has expanded its melee-screening capabilities, with the organization now able to test whether parcels of fancy-shaped diamonds contain lab-grown or treated stones.
The melee-analysis service separates natural diamonds from synthetics, simulants and stones that are potentially treated using High Pressure-High Temperature (HPHT). Since launching it in 2016, the GIA has only been able to sort round-brilliant melee, the GIA said last week.
The service processes 1,800 to 2,000 stones per hour, and can also sort screened round diamonds by color and size range. Once diamonds are sorted, the melee is sealed in a secure package and returned, the GIA noted. 
Source: DCLA