There are 5 scrap value tiers in Droid Tycoon, based on the available guide information: Common, Gold, Diamond, Rainbow, and Beskar. The guide describes them as upgrading in that order, with income increasing at each step and a larger jump at Beskar.

Quick Scoop

The scrap value system appears to follow five levels , not counting any separate non-tier bonuses or effects. One Reddit discussion also suggests scrap value is treated as a percentage-based boost tied to your base rate, but it does not contradict the 5-tier structure.

Tier Order

  • Common.
  • Gold.
  • Diamond.
  • Rainbow.
  • Beskar.

Note

Flawless is mentioned separately as a shiny effect, not a scrap value tier, so it should not be counted among the tiers.

TL;DR: Droid Tycoon has 5 scrap value tiers : Common, Gold, Diamond, Rainbow, and Beskar.