What do you roll to generate gems?

According to p. 206 of the PDF, when randomly generating a gem treasure hoard, you roll 2d20 for ornamentals and 1d100+80 for brilliants. But what do you roll for gems?

Tangentially, does the PDF update when you correct errata?

You roll straight 1d100 for gems.

The PDF does not update when we correct errata, no.