There is little to add to the others comments about gold and perseverence. Flatly put, the more you look the more you will find.
But, let's discuss a few other things on the matter that are pertinent.
First, you gotta understand that there just is not that much good gold lost. Go to any big-box store and look at the quantity of costume jewelry versus gold. They are at least even, and I'd wager the fake stuff outnumbers the good stuff 2:1. Add to that all the junk jewelry from gum machines, Avon and the many other sources and you see the odds are stacked heavily against you.
Also, when you see a nice piece of gold jewelry displayed, you have no idea what led to it's recovery, how much deduction or blind luck was involved or even what odds were overcome to get it. So give up on negative envy right off.
When you do, you have passed the first test to becoming a true detectorist.
However, don't be dismayed. There are some recognized things you can do to tilt the odds in your favor; these things you must consider.
Read on, my friend
THE BIG THREE
There are three primary elements involved in recovering lost gold jewelry. You hit on the first yourself, summarized by this question: "Where are you hunting?" Gold jewelry is made to stay on a person. It isn't meant to come off. So, there must be the right sort of activity to jar it loose from it's owner. Athletics, outdoor activities, work activities, etc. are what you want to look for.
Second, adults for the most part, have the good gold. Kids and adolescents may have a bit of it, but by and large the good stuff is worn by adults with enough money to buy the good stuff. So, you need to look for the places where earning adults are active enough to lose their good gold jewelry.
Third, there needs to be large numbers of people frequenting in the places you wish to hunt. This dramatically skews the odds in your favor. Most valuable jewelry, when discovered missing, is searched for and often found. So there must be a lot of people to both lose gold items and fail at recovering them. You really need to understand site usage and the numbers of people which pass through a given locale, if you are to get ahead of the odds.
A BLIND DOG
Now, "any one thing can be in any one place," to quote H. Glenn Carson. But he wasn't endorsing random searching with these words. Rather, he too, was suggesting adding focus to your efforts.
I was commissioned last year to search for a fellows college graduation ring. The ring had been lost in a residential backyard, while the man had gone about feeding his pet horse. It was found, without difficulty, but it was the only piece of jewelry recovered there. It was a one of a kind situation, and I was led to where it was.
So even a blind dog can sniff out a bone, now and then. But, that is definately NOT what you are after. What you must concern yourself with and focus on, is increasing the odds of finding gold jewelry.
BACK TO MATH CLASS
Lets sum this up in a short and yet familiar way - mathematically. Simply put, we have a basic "gold equation" at hand: Physical Activity + Earning Adults + Large Numbers = gold jewelry
This illustrates why the beaches along any shore produce jewlery in such steady numbers.... all three factors in the equation are present at the beach. But, you must also multiply our basic equation with what I like to call the "Beach Factor." The Beach Factor is really an amalgam of elements and includes: water (which causes skin to shrink and stretch), sweat (from sun and strenouous activity), suntan oil, sudden cloudbursts, sudden wind gusts and all the other things associated with beach going.
When we include the Beach Factor, our previous equation mow looks like this: Physical Activity + Earning Adults + Large Numbers (Beach Factor) = MORE gold jewelry
This is universal in it's application, too. From the near arctic to the equator, wherever people flock to the beach you will find a probable jewelry hotspot. If you do not have any beaches nearby, or never hunt them, then your annual jewelry finds are probably going to decrease.
Happily, there aren't many places you can live where there is no swimming area of some sort, whether freshwater or salt, within easy driving distance.
THE KEYS TO THE KINGDOM
Finally, here is the real secret, the thing most people don't talk about much: You must become selective, even exclusionary in your recoveries if you want to find gold jewelry.
I notice you have a lot coins in that pile. Quarters, dimes, cents, nickels, brass tokens - it's all there. I commend you on your effort. But only the nickles and tokens represent what would be seen by your detector as gold jewlery. When I searched for that mans ring I mentioned, I recovered nothing in the coin range except nickles and screwcaps.
Occasionally a jewelry piece will go outside the "nickle and brass" realm, but I recall a study done by Fisher years ago. In the study, it was found that 76% of gold rings were found in the nickel/pulltab range. There were a few outside of that, notably small womens jewelry which tend to be below and the 10K class ring, which tends to ring up around screwcap. But, by and large, gold jewelry falls right in the low-to-center midrange.
This means you must be eager to dig targets in this range and NOT waste time on the others - if gold is your target.
THE LOWLY PULLTAB
I don't see any pulltabs in your pile. Pulltabs are the low brow kin to gold jewelry, and they far outnumber their more valuable cousins. However it is a brutal truth of detecting that beverage pulltabs look like gold rings to a detector. Period. You cannot sugar coat that inconvenient truth, and you may as well burn that into your mind now. Go ahead, we'll wait...........
On the other hand, where you are finding pulltabs you know these things:
1. People have been there, and they have at least been active enough to be drinking beverages.
2. You are finding the right target range for gold jewelry.
So pulltabs, contrary to what you may think, are your friends and you must dig them if you want the gold jewelry. Your GTI 1500 is a premier intrument for finding that which you seek. But, when it tells you it sees a pulltab - you must believe that and dig it. You cannot shirk, or whine or pass it up, "just this once." No sir, you must recover it.
And yes, you will dig a lot of trash and very few coins that way. I'll notch in quarters or dimes when searching for rings, but that is just to keep it interesting. They are not my main quarry.
DOES IT WORK?
There was a fellow detectorist here on the forum some time back, Ralph Bryant. He notch-selected only the midrange targets and used a little Ace 250. He didn't dig coins at all, except for nickles. And he found alot of rings... I mean a lot. Not a week went by where he didn't show off a nice one. I spoke with Ralph recently, via email and he is still doing well. And he still uses this method.
Ponder these things, and vow to remain persistent. After all, if finding gold jewelry with a detector were easy, everyone would do it.