In June, July, September and October, both schools in Athens and Thessaloniki, organise short courses ( depending on the demand of the teaching subject). These courses can be about workshop techniques or designing programmes, like about enamel wax modeling, engraving, stone setting ( facet ), Jewel-cad computer Aided desinging programme or jewellery design.

HRD Antwerp organise a Certified Diamond Grading courses, in Thessaloniki and Athens - duration of 3 weeks. The students who succeed the exams will receive the Certified Diamond Grader Diploma. The lectures are held in greek, by a greek instructor, while the educational material, the books and the exams are held in english. The organization and the supervision of the courses has the tutor mr. Anastasios Spyridis, gemmologist.