Thomas Jefferson is not currently, nor has he ever been, on the U.S. quarter. What you probably have is the Jefferson presidential dollar from 2007. It's worth one dollar.
It's a modern presidential dollar coin from 2007, and is worth one dollar.
That's Ben Franklin, not Thomas Jefferson, and it's worth about $13 as of 28 Feb. 2012.
If it's the gold-colored small dollar, it's worth one dollar.
They're ordinary circulation coins worth $1 each.
It's worth $2.01.
What you're describing is the Thomas Jefferson presidential dollar. Minted in 2007, it's worth exactly one dollar.
Those dates are the years Thomas Jefferson was President. The coin is a modern presidential dollar, minted in 2007, and is worth exactly one dollar.
The 1993 Proof Thomas Jefferson 250thAnniversary commemorative silver dollar was issued as proof & uncirculated. Both have the same retail value of $19.00.
It is worth over three million dollars due to the rarity of the coin. Be careful not to confuse this with a standard Jefferson Presidential dollar coin, which is only worth $1.
I'm not sure where you got those dates, as Jefferson was in office 1801-09. Whatever the case, modern Presidential dollar coins are worth one dollar.
A Jefferson half dollar would be a real find, because Jefferson is on the nickel and JFK is on the half dollar. Regardless, a 1979 nickel is worth 5¢ and a 1979 half is worth exactly 10 times as much.