It's most probable the Seb noticed the wedding ring which Lois forgot to take off.
I would think that Lois would feel obligated to Seb to replace, or pay for the opal in some way. Maybe she can get her super husband to 'mine' a few choice pieces to act as payment for the one she took.
Tank (who knows that it would be too much to hope that Lois' disguise as a young man would include a haircut)
