Which is the best option for a short-term course in Jewelry Design and Manufacturing in India, preferably Mumbai?

Asked about Indian Institute of Jewellery (IIJ Mumbai) - Post Graduate Diploma in Jewellery Management

I am an entrepreneur and do international business, handling 2 markets - UAE and America (New York). Want to quickly upgrade my knowledge in the manufacturing processes and learn basics of design to be able to express my creative ideas on paper to customers as well as the workshop. Kindly advice.