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Contributors in Gemstones
Gemstones
Refractive index
Fashion; General jewelry
A process using a refractometer to measure the speed and angle of light entering a gemstone. Very important for gem identification.
Rough
Fashion; General jewelry
In gemology, this refers to the raw, natural state in which gems are found, before they are cut.
Rutiles
Fashion; General jewelry
Needle-like inclusions (or foreign matter) within stones. These can produce some gem phenomena as an asterism (star) or cat's eye (chatoyancy.)
Rubellite
Fashion; General jewelry
Used to refer to the red variety of tourmaline, including the colour range from pink to red. More of a marketing than a gemological term; these days gemologists tend to use simply "red tourmaline."
Saturation
Fashion; General jewelry
Saturation is one of three characteristics used to describe the appearance of color. Saturation (also known as intensity) refers to the brightness or vividness of a color. See also hue and tone.
Semi-precious (gemstone)
Fashion; General jewelry
Traditionally, the four precious gemstones are diamond, ruby, sapphire and emerald. Semi-precious gemstones include everything else. But other gems have also been labelled precious at times, ...
Portuguese cut
Fashion; General jewelry
The portuguese cut refers to a particular type of faceting where the gem is cut with three rows (simple cut = two rows) of rhomboidal and two rows of triangular facets above the girdle (crown) and ...
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