Large Sterling Silver Cognac/Honey Amber Pendant

You could call this Cognac or Honey colored Amber. I tried several photos and background to try to show the color and insides. I also have several pictures from the back to show two things. First, more views of inside. Second, I do not see a sterling maker's mark. This was a gift but from a local jeweler who thinks no mark as it is handmade. This could be turned into a brooch by a Jeweler. Non smoking home, no pets.