They will sit flush against your ear lobe which means whey won't catch on your clothes or hair. They are an ethical and completely convincing substitute for diamonds.
Moissanite doesn't weigh the same as diamond but a 4mm Moissanite is equivalent in size to a .25 ct, diamond. So, these are equivalent in diameter to half carat TOTAL WEIGHT diamond earrings.
If you've never heard of Moissanite, it is a man made diamond look alike that is almost identical to a diamond. Moissanite sparkles like a diamond and has almost the same hardness as a diamond (a 9.5 on the Moh's chart). Moissanites differ from diamonds in that they are man made and therefore completely ethical and conflict free. In the past, Moissanites were only available in a very warm color, I-J on the diamond grading scale. They are now available in a much whiter color and look just like a G-H color diamond.
Moissanite is an excellent substitute for April's birthstone.