70 FIELD MUSEUM OF NATURAL HISTORY 
A model of the Dewey diamond, weight 23 1-2 karats, found 
in 1855, near Manchester, Virginia. 
Diamond (round boart), weight 41 9-32 karats. This vari- 
ety is extremely hard, shows a radiated structure if broken, and 
is peculiar to Brazil. 
Cut and uncut specimens of black diamonds from Bahia, 
Brazil. 
A collection of over fifty diamonds in their natural state, 
and a crystal in matrix from South Africa. 
Gem gravel containing ruby, sapphire, zircon, tourmaline, 
quartz, etc., from Ceylon river beds. 
A collection of fifteen rubies from the Ural mountains. 
North Carolina, and Georgia. 
Cut and uncut specimens of various colored sapphires, found 
on the banks of the Missouri river sixteen miles from Helena, 
Montana. 
Uncut specimens of sapphires from Ceylon, Siam, India, 
and Asiatic Russia. 
Richly colored chrysoberyls and alexandrite, from Ceylon 
and the Ural mountains. 
Six star sapphires, from Ceylon, the largest of which weighs 
134 karats. 
A 99 and a 66 karat yellow sapphire (oriental topaz), a 59 
karat blue sapphire, also yellow, pink, white, and other colored 
sapphires. Spinels, fine red, blue and other colors. 
The Chilton doubly-terminated emerald crystal in a matrix 
of black limestone, from U. S. Colombia. 
Emerald crystal six inches in length and about a half inch 
in diameter, remarkable for its length, from Alexander county. 
North Carolina. 
Case 3. — Blue topaz of fine cutting and exquisite luster, 
from the Ural mountains, also topazes from Brazil, Ceylon, and 
Colorado. 
The 331 5-8 karat Hope aquamarine, the 134 karat Stoneham 
aquamarine and other fine examples of sea-green, sea -blue, 
yellow and pink beryl from Maine, California, Russia and Brazil. 
Turquoise from many localities. Also turquoise beads made 
by the Indians of Santo Domingo, New Mexico. 
Case 4. — An exceedingly fine collection of quartz and 
quartz cuttings, notably: 
A large jewel casket composed of twenty-six engraved crys- 
