Katherine Ryan welcomes four up-and-coming jewellers back to the workshop to continue their quest to impress two of the biggest names in the business.

This time, it's all about the sparkle as they work with precious gemstones. To stay in the competition, they are challenged to make an encrusted cuff bracelet before making the ultimate symbol of love: an engagement ring for couple James and Clare. But who will impress the judges enough to make it through to the grand final?