The depth percentage of a Diamond shows how deep the diamond is in relation to its width

The table refers to the flat facet of the diamond which can be seen when the stone is face up. It also happens to be the largest facet on a diamond and plays a vital role in the brilliance of the stone. The table percentage is calculated based on the size of the table divided by the average girdle diameter of the diamond

Girdle Thickness in a Diamond is the diamond’s outermost edge is also known as the girdle. This thickness is measured as a percentage of the diameter or described using words such as Medium, Thick or Thin.

Fluorescence Strength and Color of the diamond when viewed under long-wave ultraviolet light. A fluorescence description of “none” represents a range of fluorescence from Indiscernible to Very Faint. Used for identification purposes. The most common color of fluorescence is none or blue but other colors like yellow, white, greenish-yellow, green, and pink are possible too.

Polish of a Diamond refers to the overall smoothness and condition of the diamond’s surface, assessed on a scale ranging from Excellent to Poor. A well-polished diamond can produce crisp reflections and undistorted light transmission while a poorly polished diamond can look dull.

The symmetry of a Diamond refers to the exactness of shape, overall outline, placement, and alignment of individual facets, assessed on a scale ranging from Excellent to Poor. A diamond with poor symmetry will have a visible deviation from its shape and reduced brilliance due to misdirected light transmission.

Cloud is the name of inclusion in a Diamond. This indicates the presence of inclusions when viewed under 10X magnification, which is plotted on the diagram because of their sheer number or minute sizes. Many tightly grouped pinpoints that might be too small to distinguish individually but together have a hazy appearance. Usually, in diamonds with SI1 and above Clarity these will not impact the appearance of the Diamond as they are not visible to the naked eye and are already accounted for when a diamond is priced and its rating is assigned for clarity.

Pinpoints are a type of inclusions in a Diamond. This indicates the presence of inclusions when viewed under 10X magnification, which is plotted on the diagram because of their sheer number or minute sizes. Usually, in diamonds with SI1 and above Clarity these will not impact the appearance of the Diamond as they are not visible to the naked eye and are already accounted for when a diamond is priced and its rating is assigned for clarity.

Twinning Wisps are a type of inclusions in a Diamond. Typically found in slightly included (SI) diamonds, twinning wisps are caused by changes in direction during a crystal’s growth. A series of pinpoints, clouds, or crystals that form in a diamond’s growth place; associated with crystal distortion and twinning planes. Usually, in diamonds with SI1 and above Clarity these will not impact the appearance of the Diamond as they are not visible to the naked eye and are already accounted for when a diamond is priced and its rating is assigned for clarity.

For standard, D-to-Z color, round brilliant diamonds. Cut grade incorporates the aspects of face-up appearance, design, and craftsmanship. Graded on a scale from Excellent to Poor.

Certificate Comments in a Diamond certificate provide additional identifying characteristics or features that are not otherwise represented on the report. If treatment is detected, such as laser drilling, it would be described here.

Key to Symbols in a Diamond certificate lists the characteristics and symbols shown on the plotting diagram on the diamond certificate if present.

Bruise in a Diamond is a tiny area of impact accompanied by very small, root-link feathers; typically occurs at a facet junction. Having a Bruise in a diamond can severely affect the price of the Diamond. Not desirable and definitely not recommended.

The cavity in a Diamond is an angular opening is created when part of a feather breaks away or when a surface-reaching crystal drops out or is forced out during polishing. Having a Cavity in a diamond can severely affect the price of the Diamond. Not desirable and definitely not recommended.

Chip in a Diamond is a shallow opening is caused by damage to the stone’s surface which typically occurs at a girdle edge, facet junction, or culet. Having a Chip in a diamond can severely affect the price of the Diamond. Not desirable and definitely not recommended.

Feather in a Diamond is a general trade term for a break in a gemstone, often white and feathery in appearance when viewed under 10X magnification. Usually, in diamonds with SI1 and above Clarity these will not impact the appearance of the Diamond as they are not visible to the naked eye and are already accounted for when a diamond is priced and its rating is assigned for clarity.

A portion of the rough diamond’s original surface that dips below a polished diamond’s surface. Usually, in diamonds with SI1 and above Clarity these will usually not impact the appearance of the Diamond as they are not visible to the naked eye and are already accounted for when a diamond is priced and its rating is assigned for clarity.

A Knot in a Diamond is a white or transparent diamond crystal that extends to the surface after fashioning. Having a Knot in a diamond can severely affect the price of the Diamond. Not desirable and definitely not recommended.

A Needle in a Diamond is a thin, elongated crystal that looks like a tiny needle under 10X magnification. Usually, in diamonds with SI1 and above Clarity these will usually not impact the appearance of the Diamond as they are not visible to the naked eye and are already accounted for when a diamond is priced and its rating is assigned for clarity.

Crown Angle in a Diamond is the measured angle between the bezel facet plane and the table plane. The crown angle can significantly affect a diamond’s face-up appearance.

The culet of a diamond is the small, pointed area where the facets of the diamond meet at the bottom of the pavilion. It is the bottom point or tip of the diamond.

Diamonds can be Artificially Treated by methods like Irradiation, Annealing, High Pressure, High Temperature (HPHT) to enhance their color or reduce their inclusions. Artificially Treated Diamonds sell for much less and are not desirable and definitely not recommended.

Etch Channel in Diamonds are inclusions that are thin, hollow tunnels that begin on the diamond’s surface and penetrate inside. It should be noted that etch channels have the potential to fill with dirt and grime, which can be noticeable. The risk increases if the hole at the surface is large because there’s more room for the debris to enter the diamond. Once it’s inside, it can be difficult to remove.Diamond with Etch Channel is not desirable and definitely not recommended.

A Patch in a Diamond is an actual patch of color in the diamond. It is not desirable and definitely not recommended.

BGM is the acronym for Brown, Green, and/or Milky. It shows if the diamond has a Brown or Green shade or has a Milky or cloudy appearance. It is not desirable and definitely not recommended.

A Lab Certified Diamond is a Diamond that has been tested, verified, and certified by a Diamond testing Lab like GIA or IGI

An Eye Clean Diamond refers to any diamond that has no visible inclusions to the naked eye, meaning without any tools or magnification the stone should have no visible inclusions. With eye-clean diamonds, it doesn’t matter what imperfections you can see under magnification. You—and everyone else—won’t be looking at your engagement ring through a jeweler’s loupe. Every diamond manufacturer has its own rules they follow to certify if a diamond is Eye Clean or not. The Diamond certificate does not state if a Diamond is Eye Clean or not and there are no standard rules or conditions that apply. Each person's visual strength is different. Based on what the diamond distributor feels when they see the diamond, they certify it as Eye Clean or not. One person may find a diamond to be Eye Clean whereas someone else may not.

Usually, in most cases, these will usually not impact the appearance and are already accounted for when a diamond is priced and its rating is assigned for clarity.

Extra Facets in a Diamond are usually found on the bottom side of the Girdle. Extra Facets are caused by the Diamond Cutters making an extra cut in the Diamond to remove a Blemish or Inclusion that resides near the outside of the stone. Doing this raises the value of the Diamond since the Clarity of the Diamond increases. Usually, in most cases, having an Extra Facet will not impact the appearance of the diamond and it is already accounted for when a diamond is priced and its rating is assigned for clarity.

A Milky Diamond is a cloudy diamond that has inclusions that make it appear hazy in some parts or all of the diamond. For instance, multiple smaller inclusions clustered together can cause the diamond to look foggy or dull. The nature and severity of the inclusions impact how cloudy or clear a diamond looks, especially for lower graded clarity diamonds. There can be other types of inclusions like feathers and twinning wisps that can cloud the diamond.

Laser drilling within a diamond creates a surface-reaching feather, or expands a pre-existing feather around a dark inclusion so that it reaches the surface. The feather then provides access for bleaching to decrease the visibility of the inclusion. This is done when the diamond manufacturer wants to get rid of an unsightly inclusion, and drills into the stone to make it happen. Definitely not desirable and not recommended.