Gold Spot Price vs Gold Buying Price
The spot price is what a troy ounce of pure gold trades at on the world market. It is a wholesale figure for large quantities of refined metal.
A buying price is what a shop pays you for a piece of jewellery. It follows the spot price but is not the same number, because your piece is not pure, not refined, and not an ounce.
Anyone quoting you the spot price for a 9ct chain is not quoting you honestly. We publish both so you can see the difference for yourself.