UBB.threads Forums Edged Weapons HJ Edged Weapons Forum Diamond mounted on the grip?

Gentlemen,

May I ask your opinions please?

I have this early, no ricasso, Anton Wingen JR knife. It looks fine to.
Except for the diamond: it is mounted ON the grip! It is strongly attached, it does not move and I cannot see if under it a part was cut out to hold a (smaller?) diamond... It does not look like a replacement diamond to me...

Has anyone seen this before? All comments are most welcome.

Some pictures are attached.

Best greetings,

Herman