If by 20 cents you mean .20 carats, you may be able to purchase such a diamond using this example as a guideline.
Today, on Blue Nile, you can purchase a .23 carat diamond and pay between US$270 and US$782, depending on the colour and clarity that you want. A .23 carat diamond is the smallest diamond available for sale at Blue Nile today.
20 cents
it cost about 20 cents
20 cents
About 20 cents.
it is 20 cents
a dozen eggs cost 20 cents in the 1970'
20 cents.
20 cents
about 20 cents
Bout 20 cents
25 cents a pack
About 10 cents but at the time that was a dollar to them