Other than to say that there is no perfect infallible way the blog has not addressed assessing ultrasonic performance.
Ceramic g ring.
In an earlier blog i did suggest.
A spinning ring with a solitaire that remains in position on the finger steadfast and unwavering.
Unisex styles of hi tech ceramic band style rings for engagements or just everyday wear.
Wellendorff presents an innovation in jewelry manufacturing.
Steven g jewelry black ceramic band style ring 7mm wide flat center with hashed brush lines bevelled edge high polished.