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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 369

Country 
 NA Not available. XX Not applicable.' Data do not add to total shown because
ofindependentrounding.GEM STONES - 369 
Table 4.—Value of U.S. imports of synthetic and imitation gem stones,
by country 
(Million dollars) 
 1978 1979 
Synthetic, cut but unset: 
Austria                                          
France                                          
Germany, Federal Republic of__________________________ 
Japan.                                          
Korea, Republic of_________________________________ 
Switzerland                                       
Taiwan                                          
Other__________________________________________ 
Total________________________________________ 
Imitation: 
Austria_________________________________________ 
Czechoslovakia____________________________________ 
German~', Federal Republicof__________________________ 
Japan__________________________________________ 
Switzerland______________________________________ 
Other                                           
Total________________________________________ 
 1.9 5.1 
 .9 4.0 
 6.9 2.8 
 1.3 .3 
 .7 .9 
 1.7 3.8 
 .9 .5 
 1.2 5.2 
15.5 22.6 
6.3 8.2 
1.1 1.3 
4.3 3.1 
.4 .3 
.3 .1 
1.1 .8 
13.5 13.8 
Table 5.—U.S. imports for consumption of precious and semiprecious
gem stones 
(Thousand carats and thousand dollars) 
1977 
 1978 1979 
Stones 
. 
Quantity 
Value Quantity Value Quantity Value 
Diamonds: 
  Roughoruncut_ 2,909 638,205 2,463 848,651 2,120 956,340 
  Cutbutunset 3,502 806,332 3,193 1,112,907 2,347 902,755 
Emeralds:Cutbutunset 1,563 64,375 1,643 82,237 2,277 105,064 
Coral, cut but unset, and cameos 
 suitable for use in jewelry  NA 4,410  NA 4,287  NA 3,511 
Rubies and sapphires: Cut but unset  NA 33,544  NA 46,858  NA 53,513 
Marcasites  NA 58  NA 40  NA 134 
Pearls: 
  Natural  NA 544  NA 840  NA 2,453 
  Cultured_  NA 18,260  NA 27,152  NA 39,655 
  Imitation  NA 942  NA 926  NA 1,321 
Other precious and semiprecious stones: 
  Roughanduncut  NA 10,448  NA 15,888  NA 19,198 
  Cutbutunset  NA 35,617  NA 47,809  NA 44,319 
  Othern.s.p.f  NA 3,273  NA 3,951  NA 4,763 
  Synthetic: 
     Cut but unset number (thousands)_ — 15,753 10,391 17,883 15,386
20,223 22,579 
     Other  NA 864  NA 1,074  NA 1,485 
  Imitation gem stones  NA 10,841  NA 13,506  NA 13,814 
 Total XX 1,638,104 XX ' 2,221,511 XX 2,170,904 


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