RAPAPORT... Gem Certification & Assurance Lab (GCAL) will work with Everledger to share provenance and grading data that will help bring increased accountability to diamond sourcing.Through the partnership, the grading lab will be able to search Everledger's provenance information, GCAL said Tuesday. Meanwhile, the blockchain provider will gain access to GCAL's certification data and photos, giving itmore information on a diamond's route to market. Everledger can then use these details when mapping the journey of diamonds for the companies with which it works."This partnership with Everledger will enable us to combine sourcing and grading for the best possible insight into the provenance and value of a diamond," said GCAL chief operating officer Angelo Palmieri. "It will provide consumers with greater assurance and additional insight into their diamond's history and retail jewelers with more substantial information about the diamond to help close more sales."Image: Polished diamonds in a shovel. (Shutterstock)