Choose Your Goblet

Number Theory Level 2

One of the seven goblets above is made of real gold. If you start counting at A and wind back and forth while counting (A, B, C, D, E, F, G, F, E, D, ...), then the golden goblet would be the $1000^\text{th}$ one that you count.

Which one is the golden goblet?

A B C D E F G