A couple of rocks from my rock collection:

I was testing out all my currently inked fountain pens today to make sure they were working. I needed to refill a couple of them. I made the design around the rocks with all five pens.

A beautiful collection of stones with a high selling value in my opinion. But I'm a little curious about the color of the stone when using a flashlight?!

Very nice design. I think the pen works very well in skilled hands like yours.