Within the catalog of gsi diamond certification https://gemscience.net/ stones, you'll select huge precious stones with clarity of 1 to 7a and little jewels with clarity of 1 to 5. From the crown, which is how the jewel is set in a fixed way, inclusions and surrenders are not obvious to the exposed eye. The foremost invaluable virtue bunches 7 and 7a. With a 10-fold increment, you'll be able to see the abandons of the precious stone, but with the exposed eye, they will not be discernible.
Nothing wrong with jewellery, a lot of women wear it too so it does not make sense for people to hate a guy wearing it. Watches, necklaces, rings, earrings and such can be used to enhance a mans look the same way a nice v neck shirt or a nice suit can enhance a mans look and attract a woman or make him look more respectable even. There seems to be a tone of anger in some of these men with jewellery hating posts. Perhaps they are from jealous men who do not do well with the ladies and are too broke to afford nice accessories.