For crafting a Ruby in Diablo 4, you need 10 Ruby Fragments for the first- tier gem, and higher tiers cost more. The next tiers shown in current guides are 100, 1,000, and 10,000 fragments for upgraded versions.

Ruby costs

  • Damaged gem: 10 fragments.
  • Gem: 100 fragments.
  • Flawless gem: 1,000 fragments.
  • Royal gem: 10,000 fragments.

In practice

If you’re asking about the basic Ruby, the answer is 10 Ruby Fragments. For endgame crafting, the Royal version is the expensive one, at 10,000 fragments.