It is controlled by difficulty level. Only drops on Torment and higher. And if you are able to run T6 it will drop 100% of the time. And goes down from there.
Now I'm not totally sure of the other numbers but here is a rough guess:
T6 100% drop rate.
T5 80-90%
T4 65-75%
T3 50-60%
T2 30-40%
T1 is I think I saw somewhere a flat 25% chance.
Like I said I don't know the numbers for sure except the 100% on T6. So take all of the other numbers with a grain of salt.
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Now I'm not totally sure of the other numbers but here is a rough guess:
T6 100% drop rate.
T5 80-90%
T4 65-75%
T3 50-60%
T2 30-40%
T1 is I think I saw somewhere a flat 25% chance.
Like I said I don't know the numbers for sure except the 100% on T6. So take all of the other numbers with a grain of salt.