As of 12/2008, Numismedia quotes the fair market value (FMV) at $19.00 for a clad set and $35.00 for a silver "Prestige" set.
Not gold, and not proof. All proof coins dated 2000 were minted in San Francisco, and the US never struck gold quarters. You almost certainly have a normal Philadelphia quarter that's been plated with a thin layer of gold. The plating makes it an altered coin with no added value.
The 10 coin set with box list at $33.00 retail
The standard 18-coin set has a average current retail value is $26.00, issue price was $29.95
The Mint sells them for $52.95+$4.95 for S&H.
The only U.S. Mint issued proof gold set dated 1991 is the gold bullion 4 coin set. It has the $50, $25, $10 and $5 gold coins as a set. Current average market value is $4,000.00.
Current value is about $4.00
Although the 2000 Proof set originally sold for $19.95, it's value today (September 2017) is between $4 and $6.
The 2000-S, Silver 10-piece proof set has an average retail price of $40.00. The issue price was $31.95.
As of 07/2010 a 2000 silver proof set retails for about $35. Your proof set's package should say that it's a "Prestige" set. Anything else contains copper-nickel coins, not silver and sells for about $14.
What is value of proof set of Commonwealth of the Bahams proof set 1974
Numismedia lists the value around $7 dollars for clad(non-silver) and $65 for silver proof sets as of a 5/2012.
The current value of a 1962 US proof set is $29.
The current value of a 1950 proof set is $750.
The value of the set is dependent on condition. However, the proof set value is between $50 and $70 US.
1976 bicentennial proof set silver dollar half and quarter what's the value of this uncirculated set?
The current average value of a 1962 US proof set is $29.
A 1988 proof set has a retail value of $8.00 issue price was $11.00