Gold bullion is not a monetary instrument for purposes of the US currency declaration requirement. It is not considered a "negotiable monetary instrument".
Just to clarify:
This is traveling into the US, but I imagine the DR law mirrors the US:
Gold bullion in the form of a bar, be it 1oz or 1 pound, while not considered a monetary instrument for inclusion into the $10,000 restriction, must be declared.
More importantly, Gold coins issued by a monetary authority (country) that indicate a value on them (think Maple Leafs/American Eagle etc.) are considered monetary instruments AND are valued NOT on the value listed (Maple Leafs/Eagles are $50.00) BUT on the spot gold price fixed on the days/dates of travel.....unless they are numismatic (collector) coins, in which case the actual value of the coin controls....NOT the amount listed on the coin or its bullion value.
Further, if you travel with more than $10,000.00 between lets say a husband and wife or a family travelling together...you are in violation.
Your personal checkbook and credit cards are ok and need NOT be reported in most jurisdictions.
And what Cdn_Gringo and windeguy posted before me.
Respectfully,
Playacaribe2