OK. Maybe some others don’t see a potential problem with this
setting, I’m ondering, since you’re not a jeweler perhaps you are
considering this ring as a purchase?
IMHO, this ring is a time bomb. Yes its a channel, sort of. Could
also call it a modified bar set. It also seems to mimic a tension
setting in appearance. Look below the stone, you’ll see there is not
a whole lotta gold below it, Whatever bridge there may be will have
been weaken when recessed for the pavilion… That ring will tend to
fold under the stone when stressed enough. POP goes the diamond.
Also look at the one o’clock position. See a small dark half oval
’thing’? That looks like the stone was retightened with a graver. Why
did someone have to resort to that?
Having repaired quite a number of similar rings I can say the only
real cure is extreme.