Sunken Treasure

So, you think you've got something great? Well, maybe, but this is how it works. When you click on it to open (get the treasure) there is a 20% chance to get an Uncut Crystal. If that fails then there is a 15% chance to get a Silver Bar. But if that fails, there is then a 15% chance to get an Uncut Sapphire. This fail check continues until there is a success which is why there is a 100% for the Raw Pearl Clam which requires every other item to not be selected. It is your consolation prize.

Item	Nominal Rate%	Actual Rate%
Uncut Superior Grade Crystal	20%	20.0%
Silver Bar	15%	12.0%
Uncut Superior Grade Sapphire	15%	10.2%
Uncut Superior Grade Emerald	15%	8.67%
Uncut Superior Grade Ruby	15%	7.37%
Uncut Superior Grade Diamond	10%	4.18%
Gold Bar	10%	3.76%
White Gold Bar	10%	3.38%
Uncut Superior Grade Amethyst	10%	3.04%
Platinum Bar	10%	2.74%
Azurite Bar	10%	2.47%
Fire Stone Bar	5%	1.11%
Uncut Superior Grade Black Opal	10%	2.11%
Uncut Superior Grade Jadeite	10%	1.90%
Wings of Path	50%	8.54%
Poseidon's Permission	2.5%	0.21%
Pluto's Permission	2.5%	0.21%
Sylvanus's Permission	2.5%	0.20%
Raw Pearl Clam	100%	7.91%