Question

Difference between ISI , Agmark and Hallmark.

Answer 1

ISI mark is a mark for industrial products in India. The mark certifies that a product conforms to the Indian Standard, mentioned as CM/L-xxxxxxx on top of the mark, developed by the Bureau of Indian Standards, the national standards body of India. 
AGMARK is a certification mark employed on agricultural products in India, assuring that they conform to a set of standards approved by the Directorate of Marketing and Inspection an attached Office of 
Shop Hallmark for ornaments in all price ranges, including Keepsake Ornaments and personalized ornaments.

Answer 2

ISI-> Beareu of Indian standards which decides that which standard mark will be used to show the purity of an article.

Agmark-> Agricultural mark set by the ISI (previously BSI) as a standard for agricultural articles

Hallmark-> Jewellery mark set by the ISI as a standard for goods like jewellery.

Hope this helps you!