Ultrasonic cleaners will make the ring shine but not "bling, bling" like a freshly detailed car. They will remove caked on residues such as soap, dirt and body oils. It's like washing a car; it will shine but not look like it was just waxed.
If you want the "bling" back like a fresh wax job, buy a jewelers rouge cloth. It's a dry cloth that removes coated tarnish that the ultrasonic cleaner doesn't remove. Buff the ring with the rouge part of the cloth, then flip the cloth over and give a final buff with the finishing side of the cloth.
The rouge cloth makes a world of difference with polishing the gold, not the diamonds. The ultrasonic does wonders with the diamonds since you can't polish a diamond at home.
I own a professional ultrasonic cleaner and a few rouge clothes. My jewelry is sparkling. I also like the rouge cloth for buffing my vintage 14k and 18k wrist watch cases.
The clothes are super cheap and will make a huge difference. You do it by hand like you're polishing anything else. I like to wear the ring on the tip of my right index finger and polish with the cloth using my thumb. I'll use my left hand to hold my index finger with the ring on it providing more stability and rigidity.
Just like washing a car (ultrasonic cleaner) does not remove oxidation (tarnish on a ring); polishing the car (rouge cloth) will remove it.
Hope this helps.
Polishing Cloth Rouge 9½" x 10"