This stack comprises of three individual rings.  There is a shiva's eye shell on one band, the next has a triangular moonstone and the last has a rough amazonite gemstone. They are all set on sterling silver bands which have a hammered effect to represent the sea.
The spiral shell is often called ‘shiva’s eye’ and is regarded as a very important symbol especially in India.  The ‘shiva’s eye’ shells are said to awaken a sense of adventure, change and can eliminate fear!  These shells were found in Vietnam so will connect the wearer to the Pacific Ocean 
Moonstone is said to be the stone of the moon, deep healing waters, and sacred feminine energies.  The moonstone brings calm, peace, and balance 
Amazonite is said to filter stresses and have a calming effect on the wearer.  Whilst the colour of the stone conjures up memories of tropical seas. 

When worn stacked together they’ll fit a size 7-7.5 or size M-N