CATALOGUE OF GEMS AND PRECIOUS STONES. 125 



VARISCITE (AMATRICE), Tooele County, Utah. Twelve stones, cabo- 

 chon, elliptical girdle; varying from pale to dark green, mottled with 

 brown and white; 13.67 carats to 1.94 carats; 22 by 15 by 6 to 11 by 7 by 



4 mm. Cut from specimen S7402 No. 1105 



VESUVIANITE (CALIFORNITE), Big Bar, California. Thirty-seven stones, 



cabochon, various girdles; green, some with matrix; total weight, 206.65 



carats; 30 by 13 by 8 to 9 by 5 mm. Cut from specimen 87409 No. 1539 



VESUVIANITE (CALIFORNITE), Fresno County, California. Cabochon, 

 elliptical girdle; green; 5.88 carats; 16 by 8 by 10 mm. Cut from specimen 

 86945 No. 1541 



VESUVIANITE (CALIFORNITE), Lindsay, California. Eleven stones, 

 cabochon, mostly elliptical girdles; green; total weight, 56.4 carats; 23 by 

 9 by 5 to 10 by 5 mm. Cut from specimen 87410 No. 1540 



2. IMITATION STONES. 



The basis of most imitation gems is a very brilliant lead glass 

 known as "paste" or "strass." Imitation gems may consist of paste 

 alone, or of part paste and part stone, as in the "doublet" and 

 "triplet." The one is made up of a table of a genuine stone, usually 

 off-color, cemented to a pavilion made of a paste having the approved 

 color. The other consists of a crown, table, and pavilion made of a 

 pale or inferior stone, with a thin layer of colored glass at the girdle. 



Imitation pearls are made by coating the inner surfaces of glass 

 beads with a preparation made from the scales of certain fishes. 



LIST OF SPECIMENS. 



AMETHYST; eight stones, various cuts; red-violet; 25 by 13 to 10 by 7 mm. . No. 1603 



AQUAMARINE ; seven stones, various cuts; green-blue; 16 by 9 by 5 to 8 by 5 



mm No. 1596 



■CARNELIAN (artificially colored chalcedony); two stones, one table, rec- 

 tangular, one cabochon, circular girdle; red-brown; 20 by 15 by 3 and 

 16 by 7 mm No. 1588 



CAT'S-EYE; cabochon, four stones, circular and elliptical girdles; various 



colors; 19 by 8 to 13 by 7 mm No. 1581 



CHRYSOPRASE (artificially colored chalcedony); three stones, cabo- 

 chon, elliptical girdle; green; 14 by 10 by 4, 12 by 8 by 4, and 13 by 5 

 by 3 mm No. 1580 



DIAMOND ("Jagersfontein"); brilliant, circular girdle; colorless; 9 by 



6 mm No. 1590 



DIAMOND ("Light canary"); brilliant, circular girdle; pale yellow; 13 by 



9 mm No. 1591 



DIAMOND; 25 stones, brilliant, circular girdle; 15 by 10 to 7 by 5 mm No. 1592 



EMERALD (doublet); step-brilliant, rectangular girdle; green; 5.5 by 4 by 



3 mm. Mounted in a ring. Isaac Lea collection No. 827 



EMERALD (triplet); two stones, step, octagon girdle; green; 8 by 5 mm.. No. 1607 



EMERALD; eight stones, step and step brilliant, circular, octagonal, and 



square girdles; 20 by 12 to 8 by 4 mm No. 1595 



•GARNET; two stones, cabochon, circular girdle; deep red; 10 by 7 and 8 by 



6 mm No. 1602 



GEM STONE colored with uranium oxides; brilliant, circular girdle; 8 by 



5 mm. Gift of Capt. Harry Bryan No. 1610 



