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How to classify a precious stone

Amongst so many varieties of these precious minerals, it cannot be otherwise than that there should be important differences in their various characteristics, though for a stone to have the slightest claim to be classed as “precious” it must conform to several at least of the following requirements:

It must withstand the action of light [...]

Cutting diamonds

The great Cullinan diamond.

Cullinan Diamond and some of its cuts

From this remarkable diamond a great number of magnificent stones were obtained, the two chief being the largest and heaviest at present known.

Some idea of the size of the original stone may be gathered from the fact that the traditional Indian diamond, [...]

mystic influences of gemstones

mystical properties of gemstones

The physical properties of gems are a matter of scientific determination.

Not so the talismanic, curative, and supernatural powers with which since very early times man has endowed them, certain gems preserved him from incubi, vampires, and kindred terrors, others preserved him from the powers of sorcery or conferred the [...]

Jasper gemstone

Red jasper gemstone

Iron oxide, which for the most part gives color to the various kinds of chalcedony, when present in still greater amounts in the gel phases of quartz, produces opaque, deeply colored varieties of this kaleidoscopic mineral.

These deep colored, opaque quartz varieties are included under the general term of jasper. [...]

Agate gemstone

agate gemstone PI

The gel phase of silica deposition formed by successive layers of quartz produces, as we have seen, the variously colored varieties of chalcedony.

When we consider that the constitution and consequently the color of the quartz forming solutions may undergo a change or many changes in the process, we come [...]