What does Crest of Lordaeron reward?

Crest of Lordaeron gives a choice of Small Sack of Gems, 6,200 experience.

Where does Crest of Lordaeron start?

It was picked up in Stormwind City.

The quest log lists it at level 22.

Yes. Its quest id is not in Classic Era, so it is part of what Forever adds.

World of Warcraft: Forever · quest · level 22 · new since Classic Era

A level 22 quest in World of Warcraft: Forever in Stormwind City and turned in to Lady Dena Kennedy. Recorded by 7 players running the addon.

Giver shows once a player with the addon opens the quest.

Item	Given	Item level	Vendor sell
Small Sack of Gems	as a choice	1

What does Crest of Lordaeron reward?: Crest of Lordaeron gives a choice of Small Sack of Gems, 6,200 experience.
Where does Crest of Lordaeron start?: It was picked up in Stormwind City.
What level is Crest of Lordaeron?: The quest log lists it at level 22.
Is Crest of Lordaeron new in WoW Forever?: Yes. Its quest id is not in Classic Era, so it is part of what Forever adds.

What sells at this level, and what to keep from these rewards, is in the level 20 to 30 gold guide.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Stormwind City