Help me pick a gift for clients

I am project managing a launch of a new mining company. I would like to provide the top management with a gift that reflects their slogan “We see what could be”. There are 3 functions that they are all attending. My idea is to provide them each with a 3 gifts. One at each function. The gifts must not automatically be obvious to what they are but when you put all three together they make something they can use (or display or whatever). In other words they come together as something that you can see what could be. Any ideas?

What are you mining? Should that be incorporated into the gift as well? What if someone can’t/won’t make all three functions? Then they are left with 2/3s of a gift?

…I was going to say “fruit basket” when I saw the title, but now I’ll have to think about it a little more…