$3800 additional all US dollars for 4 diamonds is a major commitment, IMO. So I can see Mackennas concern. I would try and figure out if the ocean or your specific activities involving salt water is more harsh on diamonds or not. My SA said I can wear my RG one to the beach or swimming but I don't have diamonds so I'm not sure if that would change anything.
I also only use sulfate free body wash--- so I'm pretty neurotic as it is. [emoji23]
Why not just insure it?
Yes, why not just insure it & wear some kind of protective cover on it while scuba diving. If you wear a wetsuit while diving, that should already protect it from falling off & scratching.
Arwen--- what's the correct side up?