My wife thought that I was obsessed with a hobby that I didn't even have any equipment to enjoy the actual hobby. Yet 4 months after expressing my desire to get into the hobby, she got me a subscription to LT. That said, and still not having a machine, my obsession grew. I finally got my machine a couple of months ago. What did I do to [even if only temporary] win her over? I waved my detector over her chest and told her that "I found a heart of gold!"
Now, after months and months of razzing me about my obsession, she was speechless. She turned red and smiled and just stood there without a word to say.
I am planning on salting an area this Spring with a box that contains a bottle of wine and a map. The map will lead us on a predetermined adventure for the day. I'll get to express my appreciation for her understanding my obsession, and she gets an afternoon of me being a dork.
Something else you could do is bury your own time capsule. Make an afternoon of it... flowers, wine, etc. Then take some of the flowers, some poetry or a card you give to her on this day, and bury it. Wrap it up with some corny love notes to each other... and bury them.
My first adventure with my wife was in Puerto Rico where we got married and honeymooned. We buried a personal treasure that included the flowers from her hair, personal messages written by us, my boutonniere, and some other things. We made a map of that area, and we intend on going back some day. We also intend on burying a treasure whenever we take trips back to the island or even other places around the country and add those locations to our maps. We'll either go finding them when we're old and gray (or grayer in my case), or someone else will find them up and go Awwwww.
Give her an awwww factor, and though the thought of jewelry is fantastic, all she's probably wanting to know is that you're not using your outings as a specific way to get away from her. It also lets her know that you're thinking about her, even when you're detecting. Find some small way to include her, and she might even join you again in a few of your trips... even if it is to read books.
I'd say it was my 2 cents, but I dropped one of those cents and I think one of you guys picked it up.
Ohiotech