I got a this Light Earth Mage amulet from a random event...how should i use this item instead of selling it?

Explore - Graveyard - Mage Quest

You get a chance of getting a tome (Say... 2-5m? Depends on shop prices / what people are willing to pay, it's a battle-aid shall we say, helps with stats.) or a crystal shard worth like. 20k-80k? (Off the top of my head with the prices and stuff xD)

thanks for the info!!^^