Here are nine lapis lazuli pieces including a5 in the range of 8 mm by 10 mm by 3 mm, one that's 18 mm by 13 mm by 5 mm a pair of stud backed earrings about the same size as the five, and a trilliant cut solitaire that's 13.5 mm on a side by 8 mm at the center.  No chips, no scratches, they came to me in a batch of beads years ago and I couldn't use them.