The soil should be free and open, so that water may pass off readily.
Some online businesses may try to pass off fakes as the real thing.
Every morning she came in like that, and every morning prayed that the daily interview might pass off well.
Unscrupulous jewelers may pass off the total weight of the doublet as the weight of the stone and you will end up paying the opal's carat value for the total weight of the doublet, including the background stone or material.
A "power seller" with a high rating is less likely to try and pass off a fake on you.