Keep in mind that, it is not just the metal cost component that defines the price tag of a mens gold ring. These rings often have gems and diamonds set in them, stone cost would also be considered when fixing the price tag. One very important issue related to gems pricing is how, the price of a stone normally rises sharply as the gem size moves up. You can expect mens gem stone gold rings to have gem sizes in the 7mm and above range, it is not uncommon for mens rings to have gem sizes as large as 14x10mm too. The same is true of mens diamond gold rings, you would either find one large diamond or a group of diamonds with size in the 3mm to 4mm range. This is sufficient to push up the price tags of mens diamond gold rings especially, if the diamonds are in the medium to good quality range.
You ofcourse could have mens yellow gold, white gold or even mens rose gold rings. When it comes to gold color for mens gold rings, you can safely follow your personal preference. Pink gold is not very common in gold rings for men but, if you are interested in that color there is no reason why you should not choose it. If you have no specific gold color preference for your mens 14k or 18k ring, consider the gem color that you chosen. Certain gemstones look better when mounted in a specific gold color. One thing you need not worry about is the hardness of a specific gold color. Just keep in mind that, it is the gold karatage (10k, 14k, 18k) that defines the hardness of the metal. Lower karatage numbers imply a higher degree of hardness. The gold color does not influence the hardness, as long as the comparison is being between gold of the same karatage.