Gemstones

Gemstones

Industry: Jewelry

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Gemstones

Diamond cut

Fashion; General jewelry

Also known as the Brilliant Cut, the style of cutting a stone with multiple facets to maximise brilliance. Modern round brilliant cuts have 58 facets.

Dichroism

Fashion; General jewelry

Term meaning the ability of some gems to display a second shade of the same colour when viewed from a different angle. A dichroscope can see this change, and is used for identifying certain stone.

Form of heat treatment that adds one or more chemicals to the heating process to change the colour of a gemstone. Typically the treatment does not penetrate deep into the stone, so gems treated in ...

Dispersion

Fashion; General jewelry

He property of a transparent stone to split light into the seven spectral colors, causing the "fire" which is refracted by the internal facets. Diamond has a very high dispersion, hence its high ...

Fissure

Fashion; General jewelry

Surface crack on a gemstone. Gems with fissures may be Fracture Filled.

Fluorescence

Fashion; General jewelry

He ability of some gems to appear a different colour when viewed under ultraviolet light. If or not a stone has fluorescence is a valuable aid in gem identification.

Fracture filling

Fashion; General jewelry

Mall cracks or fissures in a gemstone can interrupt the flow of light through the stone, creating white or "dead" spots in the colour of the stone. Sometimes these fractures will be filled with ...