1. Department of Production EngineeringKTH Royal Institute of TechnologyStockholmSE‐10044Sweden
2. PMADepartment of Mechanical EngineeringKU Leuven & Member of Flanders MakeLeuven3001Belgium
3. Gemological InstituteChina University of GeosciencesWuhan430074P. R. China
4. Department of Materials EngineeringKU LeuvenLeuven3001Belgium