What is the collective noun jewels?

There isn't a single, universally accepted collective noun for jewels.

However, here are some options that could be used depending on the context:

Formal:

* A collection of jewels

* A set of jewels

* A treasury of jewels

* A hoard of jewels

Informal:

* A sparkle of jewels

* A blaze of jewels

* A glint of jewels

Ultimately, the best collective noun to use depends on the specific situation and the tone you want to convey.