Here's the story with the Native aspects noted:
Castle S7 Ep6–Times of Our Lives
Beckett decides to let Castle go with a semi-stern talking-to and the team focuses on questioning he woman who held him at knifepoint. Her name is Maria Sanchez, and she and her cousin were trying to return the artifact to the Incan people. She says they had nothing to do with the murder.
The mystical Native artifact is a well-worn plot device. It's stereotypical, of course, since real artifacts don't have supernatural powers.
Why don't European artifacts have as much magic as Native ones? Because Native cultures are more fantastical and unreal--at least to us.
At least Castle tried to link the artifact to the Inca religion--claiming it was a portal between universes and not just an evil talisman created by a shaman's curse. And the disk actually resembles the Inca's golden sun disk. As Wikipedia explains:
Inti is represented as a golden disk with rays and a human face. Many such disks were supposedly held in Cuzco as well as in shrines throughout the empire, especially at Coricancha, where the most significant image of Inti was discovered by anthropologists. This representation, adorned with ear spools, a pectoral, and a royal headband, was known as "punchao," meaning 'day.'
One article claimed Maria Sanchez was "a notorious stolen-artifact smuggler." Turns out she's stealing artifacts to repatriate them, which is a better cause than stealing them for profit. So the Latina or indigenous criminal is actually a good guy of sorts. Nonstereotypical minority characters aren't uncommon on TV, but it's always good to see another one.
Castle has addressed artifact smuggling--an important topic in indigenous communities--before. Now it's hinting at the subject again. Nice job, Castle.
Anyway, this wedding episode was good if not great. Even though I guessed the bad guy the moment I saw him, as usual.