It is signed "N & R Nez" on the back. From what I have read online, Nathaniel and Rosemary Nez are Navajo artists who do needlepoint in Zuni style. This piece measures almost 3.5 across. According to my postal scale, it weighs about 2.1 ounces.
The item "Silver Turquoise Needlepoint Cluster Pin Brooch Pendant Signed by N & R Nez" is in sale since Wednesday, March 21, 2018. This item is in the category "Jewelry & Watches\Ethnic, Regional & Tribal\Native American\Pins, Brooches". The seller is "mbrandt916" and is located in Sacramento, California. This item can be shipped to United States.: Signed