What are my big quartz clusters worth?

The black is 3kg, from China. Got lucky in a eBay bid, to the sellers dismay. It's missing some tips, but other tips are undamaged. Has beautiful smoke ribbons when light is shone through.

The Citrine is from the DRC, weighing roughly 1.6kg. Most of the tips are undamaged, and it has some beautiful details and rainbow refractions. Got this one while buying some goods wholesale.

Yes I know, can't put a price on your own relationship with the Stine and all that. But c'mon, I wanna know what you think the are worth?