Thanks for an informational and effective method. But it can be easily completed by using a jewelry cleaning machine. You check the best Jewelry cleaner list following http://www.jewelrycleaningmachine.com/ in 2018. Thanks
too much work just use klen Magic liquid just two to three drops scrub twice or thrice clean it with soft cloth it shines like new within a min. it can also clean diamond silver pearls platinum. brass, copper etc.