The standard

The Indian 22 karat Madras Standard refers to the historical gold purity standard used in the Madras Presidency of British India, comprising the territories of present-day Tamil Nadu, Andhra Pradesh, Telangana, Karnataka and Kerala. The standard set the conventional gold fineness for jewellery and bullion at 22 karat, equivalent to 91.6 percent pure gold by weight, the same fineness that has remained the dominant southern Indian standard through to the present day.

Historical context

The Madras Standard developed during the colonial period as the consolidation of older regional gold-purity practices in the southern Indian kingdoms. The pre-colonial gold standards varied across the southern kingdoms (Vijayanagara, the Madurai and Thanjavur Nayaks, Mysore, Travancore, Cochin) but the 22 karat standard was widely adopted because it represented the practical maximum purity at which gold could be worked into jewellery while retaining sufficient hardness for daily wear. Higher purity (24 karat, 99.9 percent) is too soft for most jewellery applications without significant work-hardening from constant wear.

The British colonial administration, in establishing assay infrastructure in the Madras Presidency, formalised the 22 karat standard for hallmarking and trade purposes. The standard distinguished the Madras gold trade from the lower-purity standards prevalent in some northern Indian markets and from the still-lower silver-alloyed standards in some Southeast Asian gold markets.

Persistence into the modern era

The 22 karat standard, formalised under the Madras designation, persisted through Indian independence in 1947 and continues to dominate the southern Indian retail jewellery market. Modern southern Indian retail jewellers, including the major chains operating in Tamil Nadu, Karnataka, Andhra Pradesh and Kerala, sell predominantly 22 karat gold jewellery, with 18 karat gold (75 percent fineness) gaining share principally in modern design segments and diamond jewellery. The 22 karat standard is now codified in the Bureau of Indian Standards hallmarking system as the 916 mark, indicating 91.6 percent pure gold.

The standard is regionally specific. Northern Indian markets, particularly in Punjab, Delhi, Haryana and Uttar Pradesh, have historically used a slightly lower purity standard around 20 to 21 karat, although the BIS hallmarking framework has now driven the entire Indian market toward the 22 karat standard for traditional jewellery and 18 karat for modern design.

Practical implications

For the working trade, the persistence of the Madras 22 karat standard has practical implications. Southern Indian estate pieces and traditional pieces are predominantly 22 karat. Reset and refurbishment work on these pieces should preserve the 22 karat fineness if the customer values the conventional gold weight retention. Mixing 22 karat gold with 18 karat gold in a single piece is technically feasible but creates galvanic considerations that should be evaluated case by case.