Gear Score shows this combination of power and quality as an objective, comparable number to a maximum of 515.
The power of a new item is dictated by your collective power and source power (e.g. NPC level, World Tier).
The quality of an item determines how many components an item has and if it has unique talents:
• Worn [Grey],
• Standard [Green],
• Specialized [Blue],
• Superior [Purple],
• High-End [Orange],
• Gear Set [Emerald],
• Exotic [Coral]
An item's power determines how good its properties can be, which is further influenced by the item's quality.
To raise your Gear Score, you need to find and equip better weapons and gear. Some activities, like Stronghold missions, will require you to reach a specific Gear Score before you can access them.
Loot drops you can find in the world are based on your peak available (anything in your inventory or stash) Gear Score and not the current Loadout power. This means you can play with any equipment combination and still receive relevant drops.
Let us know if you have any other questions!