Jewellery Design Diploma Courses Graduate Diploma in Jewellery Designing & Management – 1 Year Diploma in Jewellery Designing With CAD – 6 Months Certificate Course in Diamond Grading & Identification – 4 Months Certificate Course in Gemology – 4 Months Certificate Course in Rhino – 3D Jewellery Design – 2 Months Certificate Course in Jewellery Design – CAD MATRIX – 2 Months