Internal and external reflection of white light to the eye from a gemstone.
Standard measurement for diamond weight.
The degree to which tiny marks of nature called inclusions are present in the diamond.
Diamonds range from colorless - the rarest and most valuable - to yellowish, with a spectrum of shadings in between.
Not to be confused with the shape of a diamond. Cut refers to the arrangement of a diamond's facets. A diamond which is "ideal cut" captures and releases the maximum play of light.
Diamond without external or internal blemishes or inclusions seen under 10X magnification.
Flashes of different rainbow colors resulting from the dispersion of light.
Natural impurities in a diamond which were formed during the crystallization process.
Flashing effect produced when a diamond is moved in the light.
Top, largest and most important facet in a diamond.
Top part of the diamond above the girdle.
Circumference of a diamond which is usually held by prongs of a setting and separates the crown and pavilion. Pavilion: The bottom part of the diamond below the girdle.
Not to be confused with cut, shape means the geometric form of the stone. Popular shapes include the round brilliant, marquise, emerald cut,
Refers to a polished diamond's dimensions, facet angles and the relationships between them. For standard round brilliant diamonds, all aspects of a diamond such as table size, crown height, crown angle, pavilion depth are important and all should be in right proportion for good lustre and fire. For all diamonds, girdle thickness and culet size are reported with word descriptions based on visual assessments and are equally important for grading and valuing a diamond.
Refers to the quality of a diamond's polish (the overall condition or smoothness of its surface), and its symmetry (exactness of its outline, and the shape, placement, and alignment of its facets). Polish and symmetry are visually assessed and graded in one of the following categories. Excellent, Very Good, Good, Fair and Poor.
Refers to the emission of visible light from a diamond when subjected to ultraviolet radiation. In Diamond Reports, fluorescence is a description, nor a grade, the terms for describing the strength of fluorescence are: one, Faint, Medium, Strong, and Very Strong. For medium, strong and very strong fluorescence, the color of the fluorescence will also be noted.
A description of none refers to a range of fluorescence from indiscernible to very faint.
What IS "ideal cut"?
The ideal cut is a mathematical formula for cutting diamonds to precise angles and proportions to gain the optimum reflection and refraction of light.
You may choose to compromise on color, clarity or carat-weight, but to ensure that you have the most beautiful diamond possible, you should never compromise on cut.
Why should you choose an ideal cut Diamond?
When a diamond is ideally cut, light rays from all sides are bent towards the center of the stone and are reflected back through the top in a blaze of light.
If a diamond isn't ideally cut, light will "leak" out through the side or bottom of the diamond. The ideal cut guarantees you a spectacular balance of brilliance, sparkle and fire.
The ideal proportions of a Diamond ensure the optimal balance of brilliance, sparkle, and fire. When light enters a properly cut diamond, it is reflected from facet to facet and comes back through the top in a rainbow blaze.
In a diamond that is cut too deep, much of the light is reflected to opposite facets at the wrong angle and is lost through the sides. The diamond may appear black in the center.
If a diamond is cut too shallow, light "leaks" through the bottom and a grey ring is seen.
What are the characteristics of a quality diamond?
The 4C's determine the value of a diamond...