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sapphire

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alumina

alumina  

Aluminium oxide (SiO2), a component of dental porcelain. Also used as an abrasive material.
corundum

corundum  

Mineral, Al2O3; sp. gr. 3.9–4.1; hardness 9; trigonal; the two main varieties blue and green, but can be yellow, or brown to almost black, and transparent; adamantine to vitreous lustre; crystals ...
gems

gems  

Minerals (usually of crystallized matter) used for decorating items such as textiles and liturgical objects or for personal adornment. The most highly prized are the precious stones, diamonds, ...
precious stone

precious stone  

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Overview Page
One of the four intrinsically valuable gemstones, diamond, sapphire, ruby, and emerald, which are used in jewellery.
ruby

ruby  

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Overview Page
The transparent red variety of the mineral corundum, the colour being due to the presence of traces of chromium. It is a valuable gemstone, more precious than diamonds. The finest rubies are obtained ...
sapphire

sapphire   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
25 words

Transparent to translucent gemstone variety of corundum. It has various colours produced by impurities of iron and titanium, the

sapphire

sapphire   Quick reference

A Dictionary of the Bible (2 ed.)

Reference type:
Subject Reference
Current Version:
2010
Subject:
Religion
Length:
26 words

The second jewel in the *walls of the new Jerusalem (Rev. 21: 19); and in *Ezekiel's *

sapphire

sapphire   Quick reference

The Concise Oxford Dictionary of Art Terms (2 ed.)

Reference type:
Subject Reference
Current Version:
2010
Subject:
Art & Architecture
Length:
126 words

A rich blue gemstone, the name comes from the Greek word for blue. Sapphire is a variety of the corundum mineral, as is ...

sapphire

sapphire   Quick reference

The Oxford Dictionary of Phrase and Fable (2 ed.)

Reference type:
Subject Reference
Current Version:
2006

a transparent precious stone, typically blue, which was the second jewel in the walls of the New Jerusalem, as described in Revelations 21:19....

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