Richard, I've had these for sometime now... got them before I even had an "N" frame to put them on!
The "L" insert, I believe is silver and the black diamond is what looks like ebony (has a wood grain)
Here are some pics...
As nice as they look, when I got them they had one little problem.... someone drilled a hole in the bottom... I guess for a lanyard ring.
Now you see it...
And thanks to Keith Brown... now it's gone! Keith does some great work... you can barely see where the hole was.
In this pic, the grips aren't tightened down all the way. They probably still need a little sanding down on the forward area.