Symmetry Features
Deviation from circular shape
Tilted table / Eccentric table
Eccentric culet
Symmetry of table and table edges
Size of the facets
Regularity of the facets
Edge displacement of crown and pavilion facets
Size of the culet ...
Center Symmetry Operation
Another symmetry operation that is worth knowing is called 'center'. The center symmetry operation refers to an operation which would invert the original face of a crystal through the center of the crystal.
DIAMOND SYMMETRY
Symmetry refers to how precisely the various facets of a diamond align and intersect. This can include extra or misshapen facets, off center culets and tables, and wavy girdles.
SYMMETRY:
Symmetry is how the facets of a diamond align with each other. Differences in symmetry result in loss of light.
Symmetry
A grade given to the overall uniformity of a stone's cut. Symmetry grades range from poor (the lowest), to fair, good, very good and excellent/ideal. Poor symmetry will affect a diamond's sparkle and fire through loss of light.
Symmetry
Crystals possess a regular, repetitive internal structure. The concept of symmetry describes the repetition of structural features.
Symmetry characteristics include many features of poor and/or careless workmanship such as an off-center table or culet, a table not a regular octagon shape, an out-of-round or wavy girdle, non-parallel girdle and table, ...
Symmetry: Exactness of the diamond's outline and the shape, placement and alignment of its facets.
Fluorescence: The strength and the color of the diamond when viewed under long-wave ultra violet light.
Symmetry & Polish
Symmetry refers to the appropriateness of the shape and facet arrangement of the stone - how identical and exact the size as well as placement of each facet is.
Symmetry: The overall unity and proportion of a stone's cut. Symmetry ranges from poor to excellent.
Synthetic Gem: A manmade gem with essentially the same chemical composition, crystal structure, and properties as a natural gem.
Symmetry Grade: an assessment of a gemstone's proportion, balance, and uniformity determined by a number of criteria including length-to-width ratio, bilateral mirror images, etc.
Symmetry: A grade given to the arrangement of the facets and finished angles, created by the diamond cutter when cutting the diamond from its rough to polished form. Grades range from poor to excellent.
Symmetry: Symmetry is the arrangement of the facets and finished angles created by the diamond cutter. Excellent symmetry of a well cut and well proportioned diamond can have a great effect on the diamond's brilliance and fire.
SYMMETRY - A term referring to the quality of the fashioning of a gemstone. The balance of the outline shape and the precision of the facet arrangement are considered in the symmetry grade.
Symmetry
Grading term for the exactness of shape and placement of facets. Faults affecting symmetry include off-centre culets and tables, poor facet alignment, misshapen facets, out-of-round girdles and wavy girdles.
Table ...
Symmetry
Symmetry is how perfectly mirrored and balanced your Diamond becomes. Each Star Facet should be the exact same size, shape, width and placement around the stone. The edges of the Facets should align perfectly with other Facets.
Symmetry: Refers to variations in a diamond's symmetry. The small variations can include misalignment of facets or facets that fail to point correctly to the girdle (this misalignment is completely undetectable to the naked eye).
Symmetry: How similar one side of an object is to the other side. The lengths and angles on each side of a faceted gemstone are closely compared. The more uniform the cut, the higher the value of the stone.
Symmetry - The exactness of placement and shaping of opposed facets and other portions of a diamond. Symmetry is judged on the basis of the degree to which these opposed features yield exact mirror images.
symmetry
The alignment of a diamond's facets, relative to its axes of symmetry, used as an indicator of the quality of a diamond's cut
table
The usually large, flat facet that forms the top of a cut diamond or gemstone ...
Symmetry - Symmetry refers to the alignment of facets on the surface of the stone. There are three indicators of symmetry on a gemstone: the alignment of facets with one another, from side to side, and from top to bottom.
symmetry Facets on a diamond should be a mirror image of each of their opposites. The kite-shaped mains on both the crown and pavilion should all look the same.
Symmetry:
A grade given to the overall uniformity of a stone's cut, which can range from poor to excellent. Poor symmetry will hurt a diamond's sparkle and fire, due to loss of light as it flows through the stone and out to your eye.
Symmetry, Axis Of
Imaginary line through a crystal. If the crystal were rotated about its axis it would present an identical aspect tow or more times in a rotation of 360 degrees.
Synthetic Gemstone ...
Diamond Symmetry
A diamond's facets must be symmetrical in order to maximize the amount of light that enters and exits the stone. Diamonds with poor symmetry look slightly distorted, unbalanced and improperly shaped.
Axis of Symmetry
Axis of Symmetry refers to two planes intersecting through an object, and when rotated the separate pieces are exactly the same.
AXIS OF SYMMETRY
An axis of symmetry (also called a rotational axis) is an imaginary line around which an object can be rotated a certain number of degrees and look like the original shape.
Axis Of Symmetry: (also called a rotational axis). An imaginary line around which an object can be rotated a certain number of degrees and still resemble the original shape.
AXES OF SYMMETRY can be rather confusing at first, but let's have a go at them anyway.
Symmetry is probably more important with round diamonds than with fancy shapes so we suggest at least Very Good for symmetry and Good rating for polish if possible.
Symmetry - The uniformity of a gemstones cut is described as its symmetry. Graded from poor to excellent, only those ranked good to excellent should be considered.
Symmetry: Good diamonds have been cut symetrical.
Table:Top surface of a cut diamond. Flat like a table top.
I trust this will help you when next looking to spend some of your hard earned money.
Symmetry, or 'absolute symmetry' has played a fundamental role in the faceting of gemstones since the mid 1400s. Although faceting schemes have become increasingly complex, they are all based on several basic repeating geometric forms.
Symmetry
Grading reports also rate the overall symmetry of the diamond's facets and how well facet edges align with each other, ...
Symmetry: The measure of how well centered the table and culet are and the shape and alignment of the other facets. The GIA certificate carries these grades for symmetry; poor, fair, good, very good, and excellent.
Symmetry refers to how well the diamonds facets are aligned and "pointed". GIA defines symmetry as "the exactness of shape and placement of facets".
SYMMETRY
The symmetry of a diamond or gemstone is the uniform degree to which a gemstone is cut.
SYNTHETIC GEMSTONE ...
Symmetry: Symmetry has a great impact on the final grading of a diamond. It involves everything being equal on the diamond all around the center. They get graded from extremely poor to excellent.
Symmetry
A diamond should by symmetrical. Symmetry is the grade used to describe the uniformity of the cut of the diamond. This can range from excellent down to poor.
Symmetry
The exactness in shaping a diamond and the placing of the facets on the stone.
Synthetic Diamond ...
Symmetry. Like any finely-crafted product, well-cut gems display an obvious attention to detail. A failure to take proper care evidences itself in a number of ways, including the following: ...
Symmetry
When referring to a faceted diamond, the term means the exactness of placement and shaping of opposed facets and other portions of the stone
Synthetic stones ...
Symmetry
Graded by laboratories for diamonds on the basis of how proportionate the diamond is and how the various facets are placed in accordance with each other.
Syngenetic inclusions ...
SYMMETRY
Symmetry across an axis (also called bilateral symmetry) is when one side of an object is the mirror image of its other half - i.e.
The symmetry of an eight-sided table appealed to most Victorian furniture makers. The shape adapted well both to the Arts and. Crafts style and to art nouveau.
Symmetry
The precision of a diamond's cut.
Tachymeter (Tachometer)
An instrument on the watch that measures time and distance to determine speed. Tachymeters are typically used to measure high rates of speed.
Axis of Symmetry: Also known as the rotational axis. It is when an imaginary line passes through an object in such a way that part of the figure on one side of the line is a mirror image of the part on the other side of the line.
Plane of Symmetry
A plane of symmetry is a plane that divides a solid into two mirror-image pieces of the solid.
Plagioclase
Another name for Oligoclase.
With perfect symmetry and perfect proportions, Blue Nile Signature Diamonds are cut to gather and reflect light, for maximum brilliance. Come see the finest of all ideal-cut diamonds in the Blue Nile Signature Collection.
Symmetrical, Symmetry
In most cuts of diamond, symmetry is important and desirable.
Syndicate ...
translational symmetry
lattice (group)
classification of lattices
Miller Index ...
Some sapphires with an unusual kind of tiny needle-like inclusions can be cut in a cabochon shape to display a six-rayed white star on its surface. Star sapphires are very rare especially perfect symmetry stars on deep blue body color.
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. .
symmetry Exact proportion from an intermediate center horizontal line, vertical line, or central point. If an object has symmetry, than it can be rotated or flipped and appear the the exact same way it was before the rotate or flip.
The crystallographic polar symmetry of orthorhombic hemimorphite gave this mineral its name. A crystal displays polar symmetry (hemimorphism) when the ends of the central crystallographic axis are not symmetrical.
Recognizing crystal forms (a crystal face plus its symmetry equivalents) in the various crystal systems is one of the reasons we spend some time in lab studying block models.
Two other factors are important to cut, polish and symmetry. Polish is rated as poor to excellent, depending on the quality when examined at 10X magnification. Many diamonds do not have good symmetry, e.g.
Round became the new standard and symmetry became an important factor. European diamond cutters quickly adopted the use of machines and started producing Round Brilliants en masse.
All crystalline minerals consist of atoms packed in geometric arrays; the arrays, called crystal structures, are divided into seven crystal systems based on the symmetry of their atomic geometries.
Piezoelectricity: Piezoelectricity, or pressure electricity, is found in minerals that have polar axes or lack a center of crystalline symmetry.
 See also: Diamond, Color, Stone, Shape, Gemstone
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