no it doesn't transmit disease unless if there is some virus in nail
Yes: not a good use for a diamond, but yes, a diamond will scratch a nail.
No
That would be Talc.
i think so
i think so
quartz
dimonds is hard enough to scratch anything.
Nail polish remover... or scratch it off... It does eventually fall off.
Paint it over a new nail polish and wipe it right away
No. Only another diamond can scratch a diamond.
Your nail is 2.5 so the rocks you can scratch are, Gypsum and Talc.
Most likely you would be testing to see if the mineral was harder or softer than the nail.