Luzon Itak?

[jmings]

Originally Posted by seller

In the center of each side of the grip is what appears to be a ½” diameter chunk of clear faceted glass. It is very hard, and at first I thought it was stone, but I can see thru it.

There are a lot of clear stones. I doubt that they are diamonds, but quartz or white sapphire are just 2 possibilities. A jewler could use an eyepiece to check for double refraction and heat dissapation. You might be pleasantly suprised.