In the ordinary course of business, is that the seller must be a merchant who regularlysells this kind of goods? which means heor she cannot be a consumer?

there is another question: if consumer Amy bought a piece of jewelry from a retailer Mary and gave to her Tom as a gift , and it is PMSI consumer good, Mary has security interest in the piece of jewelry. The question is if Amy defaults, can she repossess the jewelry from Tom?