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Bureau of Mines / Minerals yearbook: Metals and minerals 1978-79
Year 1978-79, Volume 1 (1978-1979)

Baskin, G. David
Gem stones,   pp. 363-375 ff. PDF (1.3 MB)


Page 364

Gem-quality aquamarine has been found in decomposed pegmatite in the mountains
near Pierce, Idaho. 
 364 MINERALS YEARBOOK, 1978-79 
 In Rabun County, Ga., and Macon County, N.C., small quantities of gem-quality
smoky quartz have been found. 
CONSUMPTION 
Domestic gem stone output went to amathur and commercial rock, mineral, and
gem stone collections, objects of art, and jewelry. Apparent consumption
(domestic production plus imports minus exports and 
reexports) in 1978 was $1,447 million, 39% more than that of 1977. During
1979, apparent consumption decreased to $1,238 million. 
PRICES 
 A sampling of prices which colored-stone customers during December 1979
follows:~ dealers in various U.S. cities charged their 
m stone 
Carat 
weight 
Price range 
per carat 
Median pr 
E 1 
~r 
1979 
ice per carat 
December 
Amethyst                                          
Aquamarine                                        
Cat'seye(chrysoberyl)                                 
Citrrne -                      
10 
5 
2 
10 
$14 $28 
55- 300 
290-1,500 
8- 18 
$15 
168 
850 
12 
$15 
100 
800 
 9 
Emerald: 
Medium tobetter                                  
Commercial                                      
1 
1 
1,600-4,675 
250-1,500 
3,150 
900 
2,700 
900 
Garnet,green(tsavorite,demantoid)                       
Opal,black                                         
Opal,white                                         
Peridot(varietyofolivine)                              
Ruby: 
 Medium tobetter                                  
1 
3 
5 
5 
1 
425- 850 
350- 750 
60- 125 
45- 90 
950-4,000 
600 
500 
 75 
 65 
1,830 
475 
400 
 75 
 55 
1,250 
Commercial                                      
1 
450-1,550 
590 
500 
Sapphire: 
 Mediumtobetter                                  
1 
450-2,500 
750 
600 
Commercial                                      
1 
 90- 630 
225 
150 
Star sapphire: 
 Sky-blue                                         
 Grey                                          Tanzanite(blue-violetzoisite)
: 
5 
5 
5 
80- 900 
25- 150 
300- 700 
250 
100 
500 
250 
83 
413 
Topaz                                             
Tourmaline,green                                   
Tourmaline, pink                                     
5 
5 
5 
150- 265 
30- 110 
30- 145 
245 
70 
80 
193 
48 
70 
1Adjusted from Keystone prices formerly published. 
 A sampling of prices which diamond deal- customers in December 1979 fo1lows:~
ers in various US. cities charged their 


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