Does this exist?

Dana ♥

The Centenary Diamond
my guess is that it would depend on the size of the pieces?

i mean it probably doesn't already exist but the components probably do, so a competent jeweler could solder that together for you.

round stampings are readily available in sizes from about 3mm up to 63mm. for reference, 25mm is right at an inch.

now if the jump ring is supposed to be hinged so that it swings, instead of just soldered in place, that makes it a lot more complicated, but not impossible.