Shankha and its X-Ray pictures
One of the main features of a genuine Shankha is the rib/ridge like horizontal raised lines, at the inside opening. These ridges in the conch cavity, called Pilae, go through the inside of the Shankha center, called columella, right to the top. People can create fake ridges on the outside of the opening by carefully filing away a part of it and leaving out 3 or 4 faint raised lines to make it look like a real Dakshinavarti, but one thing no one can fake is this inside spiraling of the ridges to the top. This is shown clearly in the X-Ray.
But there are people now who are producing fake Dakshinavartis with fake lines.
