Natural diamond crystals are an absolute favorite of mine! And these are especially high quality, quite amazing.
I think they show the beauty and miracles that only nature can create. Man can only gild the lily, he can't create it.
I love the octahedrons especially. This sounds pretty hokey, but in my mind, they are straight from the hand of God (or Jehovah, or Allah, or whatever your particular name for her is).
I noticed that James Meyer had a ring made with a natural diamond crystal, and personally, it was my favorite of all his pieces. I also admire the rough, round, pebble diamonds. I don't know what they're called, but they're cool too.
You should make a pendent with one of the crystals (completely uncut), VL, it would be a natural treasure!