Vault of Amber

The caster arranges the gems in a circle around up to 500 lbs of non-living material, tracing transmutative sigils above each of them. The objects are then pulled into the largest gem, becoming stored in stasis. While stored, the material doesn't weather, age, or rot. You can just faintly see in the amber the barely visible shaded outline of the object, suspended & miniaturized in the middle of the amber.

The caster can use an action to speak a command word, chosen while casting the spell, to release the stored contents of the gem onto the ground. The contents're also released if the spell was dispelled.

The vault of amber can be stored w/i a Bag of Holding to hide it & its contents from divination magic.