The most difficult things to detect at the beach

I am a firm believer that target separation is more important than target depth, especially at the beach.
You would be amazed how many Bobby Dazzlers you simply walk over at the beach without even knowing it.
Valuable objects waiting to be recovered by the right person who knows they are at a site but more importantly knows how to recover them!
Many of my best beach treasure hunting days were made after spending hours meticulously and sometimes frantically searching one small area I knew had to hold what I was searching for.
Good beach treasure hunting days do not come easy, but with work hard, patience and a little faith you can experience the thrill of recovering awesome things you put the time in to search for.
My best finds come from some of the lamest looking beach sites, good finds I had to "Winkle" out.
For example beach entrances, areas other people turn their metal detectors on and walk away from, where water hunters enter the water and search away from.
It makes sense right? why hang around a trashy area when you can search for jewelry, coins or artifacts in quite areas, wrong!
Beach entrances are perfect examples of trashy areas used by a lot of people, bottle caps, ring pulls, fishing junk, aluminum foil and clad coins will make searching a popular beach entrance a lesson in frustration.
Perhaps it is understandable why a person using a metal detector would want to walk away from the trashy area, something you can use to your advantage if you understand how target masking works.
A humble one cent coin sounds like it is the size of a man hole cover when you run your search coil over it at the beach, a tin can responds the same way.
Add quarters, dimes, pull tabs and fishing weights to the area and you have a noisy minefield of undesirable objects to navigate in order to recover something of real value.
All undesirable metal objects are more than capable of masking a gold ring, old treasure coin or diamond tennis bracelet. 
One persons trash often hides another persons treasure at the beach, if you have the patience to pick thru the trash to find the treasure. 
Some of my best gold chains came off beaches after three day holiday weekends, I recovered a couple after using my secret beach hunting weapon a size 11 dive boot.
Taking the time to foot swipe tin cans, towels or fast wrappers to one side before sweeping my search coil over the trash free sand.
I have recovered dozens of diamond rings including these three beauties after investing in a few pennies, taking the time to recover several pennies from the same area instead of walking away. 

The most difficult things to detect at a beach are good things hidden between and close to trash.
Im not saying you have to dig everything, but you certainly have to remove or move a lot of unwanted stuff to get to what you are really searching for.
Iron objects mask many good targets at the beach, non ferrous objects mask just as many good targets.