How to efficiently set up tumbled crystals for quick checkout in a new POS system?

We are currently getting our stock entered for our new Shopify POS system. We sell many different types of small tumbled crystals.

What is the best way to set these up for quick check out?

sheets of barcodes at checkout to find certain crystal type and scan?

search out each crystal type to ring in?

anyone sell such items that has figured out the easiest, quickest way to do this? @