Orange is a Tier 2 or Tier 3 Jewel that is obtainable by player crafting.

Since they come in both Tier 2 and 3 varieties, you may be able to get the same level of benefit from a higher Tier vs. improving the quality of the jewel.

At this time, this jewel only use is in the reduction of cydroids, but based on the item text, it implies that they can be used to reduce construction time of EcoSim buildings.

Jewel 1

Jewel 2

Jewel 3