You might have two males, hard to tell from the pics. From my experience with them, my females all have had a pinkish hue to their bellies(except my current female whose coloration is a bit different with a all white body instead of yellowish, I think she might be kind of an albino or something, but I saw her lay eggs so I know it is a she). My males have had longer front lower fins(not sure the correct term for those) and their bodies were 'thinner' when looking at them from the side, sort of like a snow cone shape where the females were more rounded before the tail, hard to explain and I just recently lost my fish pics to a bad hard drive. Like what was mentioned above, the large spot was solid black with my males and you could see flecks of blue with the females.
The coloration of them change too, you will see them getting darker black and almost faded to nothing(depending on their moods/feeding time), usually my dominant ones had the dark colors, the faded ones would get picked on by the others. I had 4 in a tank at one time(I really hate ich), 1 male and 3 females, the female with the least color got picked on by the 3 others and then the other two females would sort of change in the pecking order depending on who had eggs. The male sort of alternated between the two and never 'paired' up with one and stayed with her.
From my other experiences the males are usually the dominant ones in the tank. Any new male I put in with a female(s) might get chased for a day, but as soon as he was fine with his new tank he became the aggressor and would harass/show off for the female(s). My current rams I had to seperate because of the male's constant harassing of the female and noticed some fin damage from his pecking.
I really like rams as a whole, they have always been very curious of the going ons in the tank, and whenever my hand or arm is in there cleaning or moving things they are there pecking at it
. I hope you did get a pair and can see their behaviour when eggs are involved. I've yet to have any hatch though, usually would get eaten or fungus formed. Best of luck to ya!