Deimantų žodynas
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Annealing
Heat treatment applied after irradiation to stabilise or further modify a diamond’s colour.
Sužinoti daugiauAsscher Cut
A square step cut with cropped corners, known for its distinctive hall-of-mirrors optical effect.
Sužinoti daugiauBaguette
A rectangular step cut, often used as an accent stone.
Bezel Setting
A setting where a metal rim surrounds the entire perimeter of the stone.
Brilliance
White light reflected from the upper facets of a diamond back to the observer.
Sužinoti daugiauCape Diamond
A diamond with a yellowish tint caused by nitrogen impurities (N3 centre at 415.5 nm).
Sužinoti daugiauCathedral Setting
A raised setting with arched shoulders resembling a cathedral.
Clarity
The degree of internal (inclusions) and external (blemishes) imperfections.
Sužinoti daugiauClarity Characteristics
Internal and external features (inclusions and blemishes) used to determine a diamond’s clarity grade.
Sužinoti daugiauCoating
A surface treatment that applies a thin layer to alter a diamond’s apparent colour; not permanent.
Sužinoti daugiauCrown
The upper portion of a diamond above the girdle — contains the table and crown facets.
Sužinoti daugiauCrown Angle
The angle between the bezel (crown main) facets and the girdle plane, influencing the balance of fire and brilliance.
Sužinoti daugiauDepth Percentage
The total height of a diamond divided by its average girdle diameter, expressed as a percentage.
Sužinoti daugiauDiamond Grading Report
A document issued by a gemological laboratory detailing a diamond’s 4Cs, measurements, and identifying characteristics.
Sužinoti daugiauDispersion
The splitting of white light into a rainbow spectrum — a diamond’s "fire."
Sužinoti daugiauFancy Vivid
The highest colour saturation grade for fancy coloured diamonds, indicating the most intense and pure colour.
Sužinoti daugiauFluorescence Grades
The five-point scale used to describe fluorescence intensity: None, Faint, Medium, Strong, and Very Strong.
Sužinoti daugiauFour Cs (4C)
Color, Clarity, Cut, and Carat — the universal diamond quality factors.
Sužinoti daugiauFracture Filling
A clarity treatment in which a glass-like substance is injected into surface-reaching fractures to reduce their visibility.
Sužinoti daugiauFTIR
Fourier-transform infrared spectroscopy, used to classify diamond type (I/II) and detect certain treatments.
Sužinoti daugiauGirdle
The widest circumference of a diamond — the boundary between crown and pavilion.
Sužinoti daugiauGrading
Systematic assessment of diamond quality according to standardized criteria.
Sužinoti daugiauHue
The dominant spectral colour of a fancy coloured diamond, such as blue, pink, or yellow.
Sužinoti daugiauIrradiation
A treatment using electron or neutron bombardment to alter a diamond’s colour, often followed by annealing.
Sužinoti daugiauKarat (Gold)
A measure of gold purity (24kt = pure gold). Not to be confused with diamond carat.
Kimberley Process
International certification system preventing the trade of conflict diamonds.
Sužinoti daugiauLaser Drilling
A clarity treatment that uses a focused laser beam to create a channel to reach and bleach dark inclusions.
Sužinoti daugiauLaser Inscription
A micro-engraving on the girdle of a diamond, typically the laboratory report number, used for identification.
Sužinoti daugiauMeasurements (mm)
The length, width, and depth of a diamond recorded in millimetres on a grading report.
Sužinoti daugiauMelee
Small diamonds (under 0.2 ct), often used as accent stones.
Milky Diamond
A diamond with reduced transparency caused by sub-microscopic inclusions or structural irregularities.
Sužinoti daugiauNatural Diamond
A diamond formed by natural geological processes in the Earth’s mantle.
Sužinoti daugiauOverweight Diamond
A diamond cut deeper than ideal proportions to retain carat weight, resulting in a smaller face-up appearance.
Sužinoti daugiauPavilion
The lower part of a diamond below the girdle — reflects light back through the crown.
Sužinoti daugiauPavilion Angle
The angle between the pavilion main facets and the girdle plane, critical for light return and brilliance.
Sužinoti daugiauPhotoluminescence (PL)
A spectroscopic technique using laser excitation to identify defect centres and detect treatments in diamonds.
Sužinoti daugiauPlot
A diagram on a grading report that maps the location and type of a diamond’s clarity characteristics.
Sužinoti daugiauPolish
The quality of a diamond’s surface smoothness resulting from the cutting and polishing process.
Sužinoti daugiauProportions Diagram
A profile view on a grading report showing key angles, percentages, and measurements of a diamond’s cut.
Sužinoti daugiauSaturation
The intensity or purity of a fancy diamond’s colour, ranging from weak to vivid.
Sužinoti daugiauSpread
The face-up size of a diamond relative to its carat weight; a well-spread stone looks larger for its weight.
Sužinoti daugiauStrain Patterns
Internal stress features visible under cross-polarised light; their character differs between natural and lab-grown diamonds.
Sužinoti daugiauTable Percentage
The width of the table facet divided by the average girdle diameter, expressed as a percentage.
Sužinoti daugiauTension Setting
A stone held by the pressure of metal arms — appears to float.
Tone
The lightness or darkness of a fancy coloured diamond’s colour, ranging from very light to very dark.
Sužinoti daugiauType I / Type II
Scientific classification of diamonds based on nitrogen content and arrangement; Type I contains nitrogen, Type II is virtually nitrogen-free.
Sužinoti daugiauUV-Vis-NIR
Ultraviolet-visible-near infrared spectroscopy, used to analyse colour origin and detect treatments in diamonds.
Sužinoti daugiauVS Clarity
Very Slightly Included — minor inclusions visible only under magnification.
Sužinoti daugiauVVS Clarity
Very Very Slightly Included — minimal inclusions, difficult to see under 10× loupe.
Sužinoti daugiauWindow Effect
A dark area in the center of a poorly cut stone where light "leaks" through.
Sužinoti daugiau