Markets close daily 17:15-18:00 ET and Fridays at 17:15, then resume trading Sundays at 18:00 ET.

The Gold  "SPOT" price, is the ever-changing benchmark 30-day Futures  value that the  banks use when trading 400 ounce Gold bars.  When retail customers purchase smaller amounts, they will pay a certain premium over the SPOT price, and when they sell, they can expect slightly below  the SPOT price, depending on the amount and condition.