Tiruchi:N. Gopaldas and Co., city-based diamond jewellers, has launched ‘Vande Mataram,’ tricolour diamond collections, marking the 60th year of Independence.Launching the collections here on Monday, Managing Partner Diljit D. Shaw said the coloured diamond jewellery was “new entrants” to south India.Since the naturally coloured diamonds are rare and expensive, the white diamonds were subjected to high-pressure colour treatment to make them cost-effective. It was completely “dosham-free,” Mihir D. Shaw, one of the partners, said.