Finding gold with a seascooter

[Goldman]

Here's a quick look at how we find gold in the Black sea with a Sea scooter ...

 

[CT-Rich]

What does the change in sand color imply? Are these rings old or lost by tourists?

 

[Goldman]

What does the change in sand color imply? Are these rings old or lost by tourists?

Mostly tourist losses, but anything can show up , the oldest pieces I've found were ancient Greek circa 500BC...
Old hard packed sand is usually dark here.