Archive for July, 2007
July 3rd, 2007 at 01:23pm
Under Symbolism
Historically, it has been claimed that diamonds possess several supernatural powers:
A diamond gives victory to him who carries it bound on his left arm, no matter the number of enemies.[27]
Panics, pestilences, enchantments, all fly before it; hence, it is good for sleepwalkers and the insane.[27]
It deprives lodestone and magnets of their virtue (i.e., ability to [...]
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July 3rd, 2007 at 01:22pm
Under Industry
The diamond industry can be broadly separated into two basically distinct categories: one dealing with gem-grade diamonds and another for industrial-grade diamonds. While a large trade in both types of diamonds exists, the two markets act in dramatically different ways.
Gem diamond industry
A large trade in gem-grade diamonds exists. Unlike precious metals such as gold or [...]
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July 3rd, 2007 at 01:21pm
Under Characteristics
The most familiar usage of diamonds today is as gemstones used for adornment. This usage dates back into antiquity and predates other uses.[citation needed] The dispersion of white light into spectral colors, is the primary gemological characteristic of gem diamonds. In the twentieth century, experts in the field of gemology have developed methods of grading [...]
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July 3rd, 2007 at 01:18pm
Under History
Formation
The formation of natural diamond requires very specific conditions. Diamond formation requires exposure of carbon-bearing materials to high pressure, ranging approximately between 45 and 60 kilobars,[10] but at a comparatively low temperature range between approximately 1652–2372 °F (900–1300 °C).[10] These conditions are known to be met in two places on Earth; in the lithospheric mantle [...]
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July 3rd, 2007 at 01:17pm
Under Properties
A diamond is a transparent crystal of tetrahedrally bonded carbon atoms. Diamonds have been adapted for many uses because of the material’s exceptional physical characteristics. Most notable are its extreme hardness, its high dispersion index, and high thermal conductivity, with a melting point of 3820 K (6420 °F) and a boiling point of 5100K (8720 [...]
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July 3rd, 2007 at 01:16pm
Under Diamonds
Diamond is the hardest natural material known to man and the third-hardest known material after aggregated diamond nanorods and ultrahard fullerite. Its hardness and high dispersion of light make it useful for industrial applications and jewelry.
Diamonds are specifically renowned as a material with superlative physical qualities — they make excellent abrasives because they can be [...]
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July 3rd, 2007 at 01:14pm
Under Certifications
To Certify Or Not To Certify
Subheadline
The question: how important is it to get a lab certificate when buying a diamond? The answer: it’s not. Most [...]
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July 3rd, 2007 at 01:13pm
Under Certifications
What is the difference between a Diamond Grading Report and an Appraisal?
A Diamond Grading Report is a document issued by a Gemological Laboratory describing a Loose Diamond. The laboratory will not issue reports on Diamonds which are set in a mounting. A Diamond Grading Report (certificate) issues a “grade” indicating the physical properties of [...]
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July 3rd, 2007 at 01:12pm
Under Certifications
What is a Certificate?
A certificate is a “blueprint” of a loose diamond. Also called the diamond grading report or diamond dossier, it tells you the diamond’s exact measurements and weight, as well as the details of its cut and quality. It precisely points out all the individual characteristics of the stone. [...]
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July 3rd, 2007 at 12:51pm
Under Certifications
Diamond Certificates are invaluable documents that show in detail a diamond’s credentials. They provide a unique fingerprint of a diamond which is a source of vital information to the trained gemologist, jeweller or consumer.
A diamond certificate will contain a complete quality description of the diamond [...]
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