Can a diamond engagement ring be retrieved after it was flushed down the toilet? Yes! Yes, it can.
I can only help your if you are located in Phoenix Arizona, but a good plumber in any area should be able to retrieve your ring.
Meet the sewer camera.
Make sure that your plumber has a sewer camera. You will need a sewer inspection. Not only can the plumber locate and retrieve your ring, they can also inspect your sewer while they are on site. To learn more about sewer camera see this page on our site about sewer camera inspection.
What to do if you flushed your ring.
STOP using all water and call the plumber immediately. Flushing the toilet, taking a shower, or using any other water will wash the ring further down the drain.
Here is a video showing how the process works:
Once the ring is retrieved, just clean it up! Here are some diamond cleaning tips.