The roughness has soft edges and may be natural to the stone rather than a post production chip - see last photo. It is not easily noticed.
T he piece has nice silver work with an old patina and has not been polished. It has minor scuffs and scratches from normal use. Pin and catch work fine.
It is unmarked but tests as sterling silver. Fresh from a Connecticut estate and new to the market. The item "Great Old Zuni Knifewing Kachina Sterling Silver Multi-stone Pin / Brooch" is in sale since Friday, July 26, 2019. This item is in the category "Jewelry & Watches\Ethnic, Regional & Tribal\Native American\Pins, Brooches". The seller is "rlantiques" and is located in Windsor, Connecticut.This item can be shipped to North, South, or Latin America, all countries in Europe, China, Japan, Australia.