How do you get a royal ruby flawless?

How do you get a royal ruby flawless?

This rank of gem only exists in Reaper of Souls and can only be created by crafting 3 Royal gems. Total cost to make a Flawless Royal: 9.8m gold, 9 Death's Breaths (81 Marquise gems).

What happens to legendary gem after Augment?

The gem is destroyed in the process of augmenting. Each level of the gem adds 5 points to a chosen stat. Augmenting doesn't stack and new augments overwrite the old ones.