From:
http://www.tradeshop.com/master/melle.shtml
Round diamond prices/per ct "Russian top cuts"
Round Diamonds, 0.02 - 0.07 Carats (1.25-2.7mm)
VS1-2 "E-F" (top quality: $1200 Pct, or $12/point
SI1-2 "G-H" (medium quality: $1000 Pct, or $10/point
Crap that we would get: ?? Pct
1 carat has 100 "points", so .01 carat is 1 point. If you got the 5 point diamond and it was medium quality and cut, it would be worth approx $50 retail. The 1 point diamond falls into a size range so would be less per carat. It would probably retail $5-$8.
These prices assume that the stone is good quality and is cut. I never got on the website, so I don't know. If they are not cut they are worth much, much less.
Get out your ruler and see how big 1mm is, and you have your approximate diamond size!