What did the servants know about Mr. Carrisford? (chp 12)

From the text:

In the kitchen—where, of course, the servants, through some mysterious means, knew everything—there was much discussion of his case. He was not an Indian gentleman really, but an Englishman who had lived in India. He had met with great misfortunes which had for a time so imperilled his whole fortune that he had thought himself ruined and disgraced forever. The shock had been so great that he had almost died of brain fever; and ever since he had been shattered in health, though his fortunes had changed and all his possessions had been restored to him. His trouble and peril had been connected with mines.

"And mines with diamonds in 'em!" said the cook. "No savin's of mine never goes into no mines—particular diamond ones"—with a side glance at Sara. "We all know somethin' of THEM."