From the ebay listing:
Their appearance was toy-like, cartoonish, or Art Deco, and they featured simple, repetitive motions performed by the doll-like sculptures. No brand names or jeweller's names appeared on the displays; most of them pitched the generic idea of buying diamonds or watches. A typical motion showed technicians working on a "diamond reactor" with dials labelled "fire" and "sparkle," and a plaque noting that "Your diamond will appear much larger in one of our modern mountings." Many depicted couples courting or honeymooning, often in fanciful surroundings such as a Well Fargo stagecoach. Placards often suggested that a diamond could facilitate a favorable courtship outcome: "You will always be on the right road with one of our beautiful diamonds."
Here is the full ebay listing for this animated Baranger diamond display.
[ Thanks Aaron! ]