1 6/8 by 1 1/8 Citrus or Hernando found by me in a field in Terrell County Georgia. It is translucent but I couldn't get a worthy picture indoors. Appears to be made from a high grade costal plains chert.
Beautiful! I vote Citrus due to the convex sides and slightly broader stem. But what do I know as I am a noob, lol. Thanks for posting as I get to practice identification.