Proportions: Faceting a gem goes to vain if proportions are not taken care of. A poorly cut stone can affect color zoning and can lead to negative effects such a window.
Well Proportioned
Tolkowsky did not use the term ideal, but this word is now used to describe a well-proportioned diamond. Both rays are reflected back through the crown (top) of the diamond towards the (presumed) viewer. This is obviously good.
PROPORTION FACTORS:
A summary of the decisions made while crafting a diamond which determine the diamond's shape, including its girdle, culet size, spread, durability, and tilt. This is a component of the cut grade, as determined by the AGSL.
The sparkling teardrop has good proportions and refracts the light well. This Loose pear diamond looks best set as a pendant or pair of pear diamond earrings.
Pear shaped diamonds are a variation of the round brilliant cut diamonds.
Proportioning the various cut facets determines the amount of brilliance and sparkle the stone has. There are several different formats for diamond proportions and stones cut to these difficult, precise proportions will have more market value.
Proportion is the single most important factor, because it determines the flow of light more than other quality factors.
Proportion - The full realization of the potential of a diamond's brilliance, dispersion and scintillation and getting the proper balance between these three elements is achieved mainly through proper cut proportions.
Proportion, Symmetry and Polish
Diamond Proportion
To optimally capture light and reflect it back, a diamond's pavilion must have accurate angles and depth.
Proportion Analyzer
For quick measurement of the proportions of the brilliant cut and for determining its percentage ratios, the Proportion Analyzer was first of all developed by the gemological Institute of America, ...
Proportion Diagram: A Graphical profile representation with the diamond's actual proportions.
Proportions and Symmetry
A Diamond could be cut with the right percentages, but if the facets don't line up, if the Diamond has a huge Culet, a large Girdle, or even a lopsided Table, ...
Proportion: The proportions of a diamond are very important so that the maximum amount of light can be reflected off and out of a stone.
Proportions
Relative dimensions and angles of a polished diamond and the relationships between them; these include table size, crown angle, crown height, girdle thickness, pavilion angle, pavilion depth, culet size, girdle outline, ...
Proportionscope - The Proportion Scope combines lenses and movable mirrors to project the silhouette of a diamond on a screen.
Proportion - Proportion is the property of the relationships between the angles and measurements on a polished gem.
proportionscope First designed and manufactured by GIA in 1967. It is an instrument that casts a silhouetted image of a diamond that allows us to check the exact proportions of the subject.
quartz Number 7 on the Mohs' hardness scale.
Proportions for Diamond Cuts
Round Cut Diamonds
Oval, Pear, Marquise & Heart-Shaped Diamonds ...
Proportion:
The relationship between the diamond's angles and parts. Refers to facet angles and the relationship between the crown (portion above the girdle) and pavilion (portion below the girdle).
Refractive Index: ...
Good Proportions are Key
Most gemologists agree that the best cut diamonds are those that follow a set of formulae calculated to maximize brilliance.
PERFECT PROPORTIONS
The style pendulum swung back again after that, as the influence of the Renaissance focussed attention back on ancient Greece and Rome, on classical ideas of proportion and the perfection of the circle, ...
Perfect Proportions
Proportions affect how light travels within the diamond. Diamonds that are cut too shallow and wide, or too deep and narrow lose light out the sides or bottom, causing the diamond to lose brilliance.
DIAMOND PROPORTION DIAGRAM
GIA Diamond Proportion Diagram
Every Lumera Diamond comes with a GIA Grading Report or Dossier certificate, most of which include a proportion diagram.
Proportion refers to the angles and relative measurements of a polished diamond. More than any other feature, proportions determine a diamond's optical properties.
Proportion
An Ideal cut has a specific set of guidelines defining the proportions that give a diamond the highest level of fire and brilliance.
Proportion - The term used in examining the overall symmetry of a gemstone.
Q
Quadrillion - A square cut diamond with 96 facets: 49 brilliant-style, 21 crown and 24 pavilion.
Proportions. The faceted cut is designed to create maximum brilliance and scintillation in the most symmetrically pleasing manner. Faceted gems feature two parts, crown and pavilion.
Proportion: Measurements that include depth percentage, table size, girdle thickness and ratio to determine what grade to give the cut of the diamond.
Proportions
Describes the cutting quality relative to the Table Percentage, Depth Percentage, Girdle Percentage, Crown and Pavilion angles and symmetry.
Radiant Cut ...
Proportions: The distribution of mass of a polished diamond above and below the girdle. The proportions are mathematically derived for the optimum treatment of light.
Proportion describes the relationship between the angles and measurements on a polished gem.
PVD Coated ...
A proportional unit used to describe the purity of gold
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The proportions and finish of a polished diamond (also called make). Cut can also mean shape, as in emerald cut or marquise cut. Proportions are the size and angle relationships between the facets and different parts of the stone.
The proportion and symmetry of the cuts as well as the quality of the polish are factors in determining the overall quality of the cut.
The proportions are calculated in angles & percentages that show how well the diamond refracts and reflects light. They will help you understand the range of well-cut diamonds offered on Diamonds.Com.
GIA proportionoscope
An optical comparator used by GIA for checking proportions of brilliant cut diamonds from .18 carats to 8 carats.
Girdle ...
Cut proportions - see discussion under Shaping
The difference in value between a poorly cut stone and a well cut stone can be as high as 30%. Beware of premium asking prices for stones of good clarity and color but of poor or mediocre cut.
Good proportions are important to give peridot his full brilliancy and special attention should be given to the quality of the polish.
Chanthaburi
Consult list of gems available on the Chanthaburi market...
Proportions
How a diamond's angles and parts relate to one another.
Push On Screw Off Earring Backs
A small metal back is pushed onto the earring's post and unscrewed when removed.
* Think proportional when it comes to choosing the shape of the stone, and the ring's thickness.
* Bold styles generally suit women with long fingers, while delicate jewelry will be unnoticeable on large hands.
The proportions and finish of a polished diamond (also called make). Cut affects both the weight yield from rough and the optical efficiency of the polished stone, the more successful the cutter is in balancing these considerations, ...
A diamond's proportions, particularly the depth compared to the diameter, and the diameter of the table (the largest and topmost facet of the diamond) determine how well light will travel within the diamond and back to the eye.
Tolkowsky's proportions gradually became the standard over the 20th century. The culet has become a point and the pavilion bezels longer and narrower. These days almost all diamonds are cut in the same Standard Round Brilliant (SRB) design.
Brillance
The proportion of brightness of light reflected from a cut surface
Brilliant
A good proportion of light returned to the viewer eye.
Fineness: The proportion of silver or gold that can be found in a metal alloy.
Finial: An ornamental often sculptured knob that sits at the terminal end of object.
Differences in proportions, inclusions, transparency, fluorescence, cutting, zoning and pleochroism can produce vast differences in the color coverage of a gem, particularly faceted stones.
Cut (Make): The proportion and symmetry of a diamond determines the stone's brilliance and dispersion capabilities.
Depth: A diamond's height from culet to table.
Depth %: Height divided by width.
Fineness is the proportion of silver or gold in a metal alloy. Fineness is usually expressed in parts per thousand. For example, the fineness of sterling silver is 925.
FINGER RING SIZE ...
Make: The cut and proportion of a diamond.
Polish: How well buffed the facets of the diamond are.
Symmetry: Good diamonds have been cut symetrical.
There are "ideal" proportions that will optimize the amount of light going in and out of a Diamond. Diamond cutters try to stay close to these ideal proportions but must also consider the possibilities of excessive weight loss.
Girdle width: The proportion of the girdle to the rest of the stone. Too thin a girdle leaves the stone susceptible to cracks and breakage, while a girdle too thick will have reduced brilliance and fire.
FINENESS - The proportion of precious metal in an alloy expressed as parts per 1000.
GOLD - Latin name Aurum. Chemical symbol Au.
GOLD FIXING - Held twice each working day at 10.30am and 3.00pm GMT.
The analysis of the proportions of metals in ore, or the testing of an ore or mineral for composition, purity, weight, or other properties of commercial interest.
Catalysts ...
Type of cut, shape proportions, symmetry, and outer marks all affect the quality of the finished gemstone. See the Cut page under our 4 C's section for a more detailed explanation.
The term "cut" also refers to the fashioning of a gem. .
AssayingThe process of determing the proportion of precious metal contained in an alloy. Asscher, JosephJoseph Asscher was an eminent diamond cutter who cut the 3,106 carat Cullinan diamond. Asscher worked in Amsterdam.
design between the 1890's and 1910; the jewelry is characterized by flowing lines, unusual interpretations of nature, the use of women with long flowing hair and the utilization of unusual materials Assaying Process of determining the proportions ...
The Mohs scale also measures hardness, except the absolute hardness scale has its numbers in proportion. Only scientists use the absolute hardness scale; mineral collectors measure hardness using the Mohs scale.
There are certain angles, percentages and proportions that must be considered and evaluated to determine the quality of a diamond's cut.
Rose Gold:Rose gold gets its color from a larger proportion of copper in the metal alloy. This gives the gold a beautiful pink color.
Polymorphism occurs when two or more mineral species contain exactly the same elements in exactly the same proportions, and therefore share a chemical formula, yet possess dissimilar lattice structures.
Then borax powder is added until the top third mark is reached (These proportions would be good for the water based approach as well.). Solvent alcohol is added until the container is almost full.
 See also: Color, Stone, Diamond, Cut, Jewel
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