Gold jewellery and artifacts having only a four-digit number Hallmark Unique Identification (HUID) number as a hallmark cannot be sold from March 31, the Ministry of Consumer Affairs has announced.

From April 1, only those gold jewellery and artifacts with a six-digit alphanumeric number as a hallmark can be sold, Nidhi Khare, additional secretary, of consumer affairs said. Hallmark Unique Identification (HUID) number is a six-digit alphanumeric code consisting of numbers and letters.