_Geology of India_
(1881); C. W. King, _The Natural History of Precious Stones_ _and
Precious Metals_ (1883); M. E. Boutan, _Le Diamant_ (1886); S. M.
Burnham, _Precious Stones in Nature, Art and Literature_ (1887); P.
Groth, _Grundriss der Edelsteinkunde_ (1887); A. Liversidge, _The
Minerals of New South Wales_ (1888); _Tavernier's Travels in India_,
translated by V. Ball (1889); E. W. Streeter, _The Great Diamonds of
the World_ (1896); H. C. Lewis, _The Genesis and Matrix of the
Diamond_ (1897); L. de Launay, _Les Diamants du Cap_ (1897); C.
Hintze, _Handbuch der Mineralogie_ (1898); E. W. Streeter, _Precious
Stones and Gems_ (6th ed., 1898); Dana, _System of Mineralogy_ (1899);
Kunz and others, _The Production of Precious Stones_ (in annual,
_Mineral Resources of the United States_); M. Bauer, _Precious Stones_
(trans. L. J. Spencer, 1904); A. W. Rogers, _An Introduction to the
Geology of Cape Colony_ (1905); Gardner F. Williams, _The Diamond
Mines of South Africa_ (revised edition, 1906); George F. Kunz,
"Diamonds, a study of their occurrence in the United States, with
descriptions and comparisons of those from all known localities" (U.S.
Geol. Survey, 1909); P. A. Wagner, _Die Diamantfuhrenden Gesteine
Sudafrikas_ (1909).

Among papers in scientific periodicals may be mentioned articles by
Adler, Ball, Baumhauer, Beck, Bonney, Brewster, Chaper, Cohen,
Crookes, Daubree, Derby, Des Cloizeaux, Doelter, Dunn, Flight,
Friedel, Gorceix, Gurich, Goeppert, Harger, Hudleston, Hussak,
Jannettaz, Jeremejew, de Launay, Lewis, Maskelyne, Meunier, Moissan,
Molengraaff, Moulle, Rose, Sadebeck, Scheibe, Stelzner, Stow. See
generally Hintze's _Handbuch der Mineralogie_. (H. A. MI.)

FOOTNOTE:

[1] Diamonds are invariably weighed in carats and in 1/2, 1/4, 1/8,
1/16, 1/32, 1/64 of a carat. One (English) carat = 3.17 grains = .2054
gram. One ounce = 151-1/2 carats. (See CARAT.)

DIAMOND NECKLACE, THE AFFAIR OF THE, a mysterious incident at the court
of Louis XVI. of France, which involved the queen Marie Antoinette. The
Parisian jewellers Boehmer and Bassenge had spent some years collecting
stones for a necklace which they hoped to sell to Madame Du Barry, the
favourite of Louis XV., and after his death to Marie Antoinette. In 1778
Louis XVI. proposed to the queen to make her a present of the necklace,
which cost 1,600,000 livres. But the queen is said to have