To dream of owning Diamonds is a very propitious dream, signifying great honor and recognition from high places.
For a young woman to dream of her lover presenting her with Diamonds, foreshows that she will make a great and honorable marriage, which will fill her people with honest pride; but to lose Diamonds, and not find them again, is the most unlucky of dreams, foretelling disgrace, want and death.
For a sporting woman to dream of Diamonds, foretells for her many prosperous days and magnificent presents. For a speculator, it denotes prosperous transactions. To dream of owning Diamonds, portends the same for sporting men or women.
Diamonds are omens of good luck, unless stolen from the bodies of dead persons, when they foretell that your own unfaithfulness will be discovered by your friends.
Gustavus Miller's Book of Dreams