Silver "water rings"

From JSurine on Etsy: Interesting patinaed silver rings from the same block: "These bands are made from the same original piece of metal that has been forged and formed into the band it is now. What was one piece has been cut into two...These rings are then patinaed together, and although the patina process is somewhat unpredictable, the coloring on the rings is more likely to match because it was done at the same time and exposed to the process the same length of time. Resulting in a more similar coloring and finish." Michigan