Ruby and Sapphire - Vietnam - 1993
Mineral: Ruby, Sapphire Gemstone
Color: Red, Blue
Country: Vietnam
Year: 1993
Faceted rubies and sapphires gems from Vietnam. (and/or Spinel, Garnet?)
This Vietnamese stamp was issues for the Bangkok World Philatelic Exhibition in 1993.
Souvenir sheet:
Gemstones Vietnam
Vietnamese research in geology has indicated a high potential for gemstones in Vietnam and has found in this last decade numerous gem deposits, especially ruby and sapphire. In northern Vietnam, gem corundums are found in the Luc Yen, Yen Bai and Quy Chau areas, in primary deposits hosted by metamorphic rocks and in placers. In secondary deposits, ruby and sapphire are associated with gem spinel and garnet. In southern Vietnam, sapphires are related to alkaline basalts, with blue sapphires being economic. Sapphires are recovered with gem zircons and peridots in placers. Aquamarine, beryl, topaz, quartz crystals (amethyst, citrine, morion), tektite, fluorite, opal, chalcedony, jadeite, nephrite and amazonite are the other gemstones exploited in Vietnam. Ruby, sapphires and pearls provide important commercial exchanges in the gemstones markets of Vietnam and other foreign countries.
These pictures below are from:
http://www.palagems.com/gemstones_in_vietnam.htm
Figure 1.
Map of Vietnam showing the location of gemstone occurrences.
Figure 2.
Geological map of Yen Bai area with locations of ruby and sapphire deposits.
Figure 3.
Exploitation of ruby in Tan Huong mine.
Figure 4.
The ruby called Star of Vietnam weighing 2.58 kg that was found in the Tan Huong mine.
Figure 5.
Flakes of phlogopite (brown) associated with a 1.5 cm long ruby crystal from Minh Tien area.
Figure 6.
Gem-quality rubies and pink sapphires from Luc Yen deposits.
Figure 7.
The Luc Yen gemstones market.
Figure 8.
Rough ruby from Quy Chau deposit.
Figure 9.
Rough aquamarine from Thach Khoan deposit.
Figure 10.
Rough tourmaline from the Luc Yen deposits.
Figure 11.
Cut peridot from the Tay Nguyen highland of Vietnam that range in size from 2.35 to 8.42 ct.
Figure 12.
Removing oysters from their cages and preparing for the operation of nucleus insertion at Ha Long Bay, northern Vietnam.
These pictures below are from:
http://www.palagems.com/gemstones_in_vietnam.htm
Figure 1.
Map of Vietnam showing the location of gemstone occurrences.
Figure 2.
Geological map of Yen Bai area with locations of ruby and sapphire deposits.
Figure 3.
Exploitation of ruby in Tan Huong mine.
Figure 4.
The ruby called Star of Vietnam weighing 2.58 kg that was found in the Tan Huong mine.
Figure 5.
Flakes of phlogopite (brown) associated with a 1.5 cm long ruby crystal from Minh Tien area.
Figure 6.
Gem-quality rubies and pink sapphires from Luc Yen deposits.
Figure 7.
The Luc Yen gemstones market.
Figure 8.
Rough ruby from Quy Chau deposit.
Figure 9.
Rough aquamarine from Thach Khoan deposit.
Figure 10.
Rough tourmaline from the Luc Yen deposits.
Figure 11.
Cut peridot from the Tay Nguyen highland of Vietnam that range in size from 2.35 to 8.42 ct.
Figure 12.
Removing oysters from their cages and preparing for the operation of nucleus insertion at Ha Long Bay, northern Vietnam.
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