Illuminated gemstones

Illuminated gemstones crystal lamps

 

A gemstone or gem, also called a precious or semi-precious stone, is a piece of

rock mineral, which when cut and polished  is used to make jewelry or other  adornments such as gemstone sculptures, natural crystal sculptures or rock crystal

sculptures.

Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone.

 

Historically gemstones were classified into two categories; precious and semi-precious. Though today we think primarily of diamond, ruby, sapphire, and emerald as "precious", these categories are based mainly on fashion and the composition of these two lists has changed frequently over time . Semi precious is usualy the category that is used for a  gemstone sculpture,  natural crystal sculpture or rock crystal sculpture

Recently a system named "four C's" (color, cut, clarity and carat), was introduced to help the consumer understand the factors used to grade a diamond. With modification these categories can be useful in understanding the grading of all gemstones. The four criteria carry different weight depending upon whether they are applied to colored gemstones or to colorless diamond. In diamonds, cut is the primary determinant of value followed by clarity and color. Diamonds are meant to sparkle, to break down light into its constituent rainbow colors (dispersion) chop it up into bright little pieces (scintillation) and deliver it to the eye (brilliance). This is a function of cut. In its rough crystalline form, a diamond will do none of these things, it requires proper fashioning and this is called "cut". In gemstones that have color, including colored diamonds, it is the purity and beauty of that color that is the primary determinant of quality

A few gemstones are used as gems in the crystal or other form in which they are found. Most however, are cut and polished for usage as jewelry. Crystal rocks are used in there natural form as natural crystal sculptures, rock crystal sculptures or as they are simply called gemstone sculptures.

Color is the most obvious and attractive feature of gemstones. The color of any material is due to the nature of light itself. Daylight, often called white light, is actually a mixture of different colors of light. When light passes through a material, some of the light may be absorbed, while the rest passes through. The part that is not absorbed reaches the eye as white light minus the absorbed colors.

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