CS 12: Ruby

Question 1

In ancient Sanskrit, ruby is called ratnaraj or…

Answer 1

“King of Precious Stones”

Question 2

The most valuable tone and saturation for ruby are..

Answer 2

Medium to medium-dark tone and vivid saturation

Question 3

Corundum can form only in an environment that’s low in

Answer 3

Silicon

Question 4

Rubies that come from marble deposits are typically low in

Answer 4

Iron

Question 5

Ruby deposits in Thailand, Cambodia, and Madagascar are associated with

Answer 5

Alkali-Basalt

Question 6

Heat-treating Mong Hsu rubies does what?

Answer 6

eliminates dark centers or cores

Question 7

The world’s largest corundum marketing center is

Answer 7

Thailand

Question 8

Switzerland exports rubies that are primarily

Answer 8

High End

Question 9

What location has supplied the world with most commercial-quality rubies since 1991?

Answer 9

Mong Hsu

Question 10

In the early 1980s, the major source for rubies was

Answer 10

Thailand

Question 11

Compared to rubies from Myanmar, most Thai rubies tend to be

Answer 11

Darker

Question 12

Rubies from Pailin, Cambodia, are similar to those from

Answer 12

Thailand

Question 13

Vietnamese rubies originate in

Answer 13

Marble

Question 14

Where are the Penny Lane and John Saul mines located?

Answer 14

Kenya

Question 15

Newly discovered ruby deposits at Vatomandry and Andilamena are in what country?

Answer 15

Madagascar

Question 16

What gem can command the highest per-carat price of all colored stones?

Answer 16

Ruby

Question 17

What does ruby rate on the Mohs hardness scale, making it ideal for frequently worn jewelry?

Answer 17

9

Question 18

What are the most valuable ruby colors?

Answer 18

Red to slightly purplish red with medium to medium dark tones and vivid saturation

Question 19

What does chromium in rubies do?

Answer 19

1. causes rubies to be red
2. can fluoresce which intensifies bodycolor

Question 20

Where do the finest rubies typically form in?

Answer 20

marble deposits

Question 21

What is an effect of the iron in basalt-hosted rubies?

Answer 21

Fluorescence

Question 22

What country imports more rubies than any other country

Answer 22

USA

Question 23

Where is the world’s largest corundum marketing cnter, exporting most of the faceted commercial-quality rubies on the market?

Answer 23

Thailand

Question 24

What country deals primarily in high-end rubies and gemstones from other countries?

Answer 24

Switzerland

Question 25

What is the most important historical ruby source?

Answer 25

Mogok, Myanmar

Question 26

What country supplies the majority of commercial-quality rubies?

Answer 26

Mong Hsu, Myanmar