This set of 5 Sterling Silver Round Sapphire Stud Earrings offers a decent selection of colors.  The actual studs are a bit on the small side, but as a set this is a pretty good buy.  You get a set in white, lavender, orange, pink, and blue.  The mounts are fairly standard and appear to be well made.

The posts have a good length on them, so they are easily put on and removed.  The nuts were fairly tight, but over time that will likely solve itself.  Overall, a pretty good buy.