Having bought these earrings first-hand, the lineage of this item is undeniably direct. I bought them from the man who sold them to me, and the man himself was the silversmith who created them. But this story of lineage does not have to be so simple, and I wish that there were ways that I could investigate further into the background of the man who had sold them to me. How long has he (and presumably his family) been working in Taxco, and by extension, is silversmithing a familial trade? This could say a lot about heritage and work in Mexico, for in my experience it is not uncommon for children to follow in the career paths of their parents, especially when it has to do with a craft. My uncle owns a small taqueria in the town where he has lived his entire life, and although my uncle was an entrepreneur and started the restaurant himself, there is no doubt that one of his two sons will eventually take it over when he retires. Therefore, the earrings themselves may not have a lineage to them, but the craft of silver working is most likely one that has been passed down for at least a few generations in the family of the man I bought them from. There could perhaps be a certain way of making these earrings (and the design within them) that is specific to the way this family works with silver. But, unfortunately, I do not know  for sure. All I can say is that the family trade does not go back further than the aftermath of the Mexican Revolution, because silver in Taxco was not so heavily commercialized (and used as a tourist attraction) before then.