I mined a bunch of lapis and diamond today, and found out that it seems like lapis gets much less flawless ore per ore mined. Considering it's only 10% more common than diamond, I think that the rate of flawless lapis could use with an increase.
The sample size I used was approximately 800 diamond ore and 800 lapis ore.
The sample size I used was approximately 800 diamond ore and 800 lapis ore.