Have you got any pics of it? Might help out with identifying the exact model, and make it easier for those that might be able to offer some advice - congratulations on the purchase.
I picked the Garret ADS Deep seeker up this morning and tried it out on a gold ring about 6 Inch deep and it did detected it easy.
Had to learn the settings and it looks like i am missing the little stalk going from the handle on the box to the elbow rest
So have to make one at work tomorrow if i have some time.
This thing is very sensitive and i have to see how i can learn how to operate it.
I have the manual and printed it out to take with me on my first outing with it.