Yeah there are three different degrees of cleaning. Pls excuse my wording as I'm not a jeweler.
1 - Standard cleaning like cleaning dishes. I usually refer as to having a bath for my items - they really put them in a hot water dish with detergent and use ultrasonic waves. Really shows a difference. Try to bring in as much of my items whenever I visit a boutique. Still don't want to take off the Loves. Scratches obviously will remain.
2 - Deep cleaning. Not sure what they use exactly; most likely a cloth rouge. Look like new but large scratches remain and not possible with diamonds
3 - Intense polish. Not more than 2-3 times, will remove scratches but takes off a layer of gold and may alter the shape. A Love of my SA was treated mistakenly but it looked just perfect, maintaining the sharp edges. Diamonds and emeralds have to be removed first.
This is what I learned over time. As said my PhD is in Chemistry so sbd may know more