CS 12: Ruby Flashcards
In ancient Sanskrit, ruby is called ratnaraj or…
“King of Precious Stones”
The most valuable tone and saturation for ruby are..
Medium to medium-dark tone and vivid saturation
Corundum can form only in an environment that’s low in
Silicon
Rubies that come from marble deposits are typically low in
Iron
Ruby deposits in Thailand, Cambodia, and Madagascar are associated with
Alkali-Basalt
Heat-treating Mong Hsu rubies does what?
eliminates dark centers or cores
The world’s largest corundum marketing center is
Thailand
Switzerland exports rubies that are primarily
High End
What location has supplied the world with most commercial-quality rubies since 1991?
Mong Hsu
In the early 1980s, the major source for rubies was
Thailand
Compared to rubies from Myanmar, most Thai rubies tend to be
Darker
Rubies from Pailin, Cambodia, are similar to those from
Thailand
Vietnamese rubies originate in
Marble
Where are the Penny Lane and John Saul mines located?
Kenya
Newly discovered ruby deposits at Vatomandry and Andilamena are in what country?
Madagascar
What gem can command the highest per-carat price of all colored stones?
Ruby
What does ruby rate on the Mohs hardness scale, making it ideal for frequently worn jewelry?
9
What are the most valuable ruby colors?
Red to slightly purplish red with medium to medium dark tones and vivid saturation
What does chromium in rubies do?
- causes rubies to be red
- can fluoresce which intensifies bodycolor
Where do the finest rubies typically form in?
marble deposits
What is an effect of the iron in basalt-hosted rubies?
Fluorescence
What country imports more rubies than any other country
USA
Where is the world’s largest corundum marketing cnter, exporting most of the faceted commercial-quality rubies on the market?
Thailand
What country deals primarily in high-end rubies and gemstones from other countries?
Switzerland
What is the most important historical ruby source?
Mogok, Myanmar
What country supplies the majority of commercial-quality rubies?
Mong Hsu, Myanmar
