https://www.bjultrasonic.com/shop/ultrasonic-horn/ Manual polishing is a very tedious process, and in particular very small intricate detail work requires additional effort and patience. Ultrasonic polishing machines, available now for quite some time, have been improved in recent years

Ultrasonic cleaners have been popularly and efficiently used to clean intricate works of fine metal and gemstone jewelry. Not only that, but ultrasonic cleaning has also been declared safe for corundum stones, including sapphire and rubies by the Gemological Institute of America’s Essential Colored Stone Reference Guide. However, it should be kept in mind that