When using the Auto-Invest feature, you can set the rule based on money amount or gold quantity. As gold price is dynamic and keeps changing over time, you will get the final gold unit price on the day when the Auto-Invest rule is going to be executed. 

See the conditions below that may cause purchased gold might be different from the Auto-Invest rule.

• If you set the rule based on money amount, then the purchased gold quantity will be dynamic (following the gold price that you get on that day). You will receive the gold quantity equal to or less than the estimated amount that you have set.
• If you set the rule based on the gold quantity, then the final money deduction amount will be dynamic (following the gold price that you get on that day). However, the amount of gold that you get will always be consistent in this case.