Need help with this pin

[sora]

Hi, I got this at a garage sale,so far I know it's from 1951, has Latin writing, its religious,and maybe has something to do with school.
I would like to know where it could be from what it was for and maybe its value? Just anything ...Thank you!
Its about the size of a nickel ☺

 

[Starfacet]

https://en.wikipedia.org/wiki/College_of_Saint_Teresa
"The College of Saint Teresa was a Catholic women's college in Winona, Minnesota. Previously a women's seminary, it became a college in 1907 and was operated by the Sisters of Saint Francis of Rochester, Minnesota until its closing in 1989."


https://www.ebay.com/itm/1951-Estat...Teresa-Catholic-Purity-Winona-MN/201912410535
According to the eBay listing, the mark on the back says 10K gold.

https://visitwinona.com/directory_entry/alumnae-association-of-the-college-of-saint-teresa/
Alumni association of the school.

 

[sora]

Very cool!!! Thank you!
You rock!!!