1 - If you have already broken them and have some space in your inventory I would tell you to guard them until the arrival of the phanton orb store (each SR copy give to you 25 orbs where you can exchange for eildon ssr from past or other events stuff)
2 - the value will remain the same, so it will only be waste gems
edit: for each star of sr you get 25 orbs. MLB = 125