(IDEX Online) - Tiffany and Pandora receive the highest rankings for responsibly sourcing their supplies of diamonds, gold and other minerals, in a report by the Human Rights Watch.But overall there is still long way to go to wipe out human rights abuses across the supply chain, it concludes.The US and Denmark-based jewelers performed strongly by taking significant steps towards responsible sourcing but were not ranked as excellent.Chow Tai Fook (Hong Kong), Christ (Germany) and Tanishq (India) were all scored as weak, having taken few steps to ensure their supply chain was free of human rights abuses.The New York-based NGO selected 15 of the of the industry's largest and best-known jewelry and watch companies for its report entitled Sparkling Jewels, Opaque Supply Chains.Four of them Kalyan (India), Mikimoto (Japan), Tribhovandas Bhimji Zaveri Ltd. (TBZ)(India) and Rolex (Switzerland) did not provide information. Bulgari (Italy), Cartier (France) and Signet (United States) were ranked moderate, and Boodles (United Kingdom), Chopard (Switzerland) and Harry Winston (United States) were assessed as fair. Almost all the companies (except for Mikimoto and Chow Tai Fook) featured in a similar report in 2018. HRW said there had been been some progress in individual company practice and in industry standard-setting since then.But it lamented the fact most companies still "fall short of meeting international norms, and existing certification schemes lack rigor and transparency". Much more needs to be done to assure consumers that the jewelry they buy is sourced responsibly, say the authors.They say most jewelry companies are still not able to trace their gold and diamonds to the mines of origin, so they are unable to even check on workers' conditions.Generic pic shows diamond panning in Indonesia