Glossary & Picture Library

An abraded culet refers to a diamond culet (the small facet at the bottom of the diamond)[…]

An abraded facet edge in a diamond refers to the condition where the sharp edges of a[…]

Abrasion on a diamond refers to the process where the surface or facets of a diamond become[…]

Archaic Greek word from which the word ‘diamond’ is derived. Adamas means ‘indestructible’.

Annealing diamond refers to a process in which diamonds are heated to high temperatures in a controlled[…]

Diamond or Jewellery Appraisal or Valuation is a professional evaluation of a diamond or piece of jewellery[…]

The Asscher Cut is a distinctive and elegant diamond shape, known for its square shape and step-cut

The Baguette Cut is a distinct rectangular diamond shape, typically with step-cut faceting, although it can also[…]

Bearding in a diamond refers to the small, hairline fractures or feather-like inclusions that appear along the[…]

Bezel facets in a diamond refer to the flat, triangular facets that are found on the crown[…]

A black diamond is a type of diamond that is opaque or dark in colour, typically appearing[…]

A blemish is a flaw on the exterior of a diamond, such as a scratch, abrasion, nick[…]

A blood diamond (also known as a conflict diamond) refers to a diamond that is mined in[…]

A blue diamond is one of the rarest and most sought-after types of coloured diamonds, known for[…]

A blue-white diamond is a type of diamond that displays a combination of both blue and white[…]

A bow tie in a diamond refers to a dark shadow or dark area that appears across[…]

Diamond briefca (sometimes spelled briefcase or brief), which is a small, folded, envelope-like paper used to safely[…]

Diamond brilliance refers to the amount of white light that is reflected from a diamond.

The brilliant cut is one of the most popular and widely used diamond cuts, known for its[…]

A briolette diamond is a unique and beautiful cut that features a tear-drop or pear shape with[…]

A bruted diamond girdle refers to the technique used in the finishing process of a diamond, specifically[…]

A burn mark on a diamond facet typically refers to a discoloration or imperfection caused by excessive[…]

The Calf’s Head Diamond is a historic and notable diamond that is part of British royal history.

Can I bring my diamond jewellery to the laboratory for certification?

Can you identify the latest diamond simulants, diamond treatments, and synthetic diamonds?

A Canary Diamond is a highly sought-after type of fancy yellow diamond known for its rich, intense[…]

Cape Series Diamonds refer to a category of diamonds that exhibit a noticeable yellow or brown tint[…]

One carat is equal to 200 milligrams (0.2 grams).

Diamonds are made of pure carbon, but their unique atomic structure is what gives them their remarkable

Small black graphite inclusions in a diamond are a type of natural impurity that occurs during the[…]

Type of diamond inclusion that appears as an opening or large indentation on the surface of a diamond

A diamond certificate, also known as a diamond grading report, is an official document issued by a[…]

Chameleon diamonds typically shift from an olive green or grayish-green hue to a yellow or orangey-yellow shade[…]

A champagne diamond is a type of fancy-coloured diamond that exhibits a warm brown hue with subtle[…]

A chipped diamond refers to a diamond that has sustained a small break or loss of material[…]

CIBJO, also known as The World Jewellery Confederation, is a global organization that represents the jewellery industry.[…]

Diamond clarity refers to the presence and visibility of inclusions (internal flaws) and blemishes (external flaws) within[…]

Clarity enhancement in diamonds refers to the process of improving the appearance of a diamond by reducing[…]

Cleavage in a diamond refers to the ability of a diamond to split or fracture along specific[…]

A diamond with a relatively small table refers to a diamond where the table facet

A cloud in a diamond refers to a type of inclusion consisting of tiny, hazy clusters of[…]

A coated diamond refers to a diamond that has undergone a treatment where a thin layer of[…]

A Cognac diamond is a type of brown diamond that is characterized by its rich, warm brown[…]

A diamond cold laser inscription is a process where a laser is used to etch a unique[…]

Diamond Colour is one of the most important factors in determining a diamond’s quality and value. DCLA[…]

A coloured diamond is a diamond that exhibits a hue other than the traditional colourless range.

Conflict diamonds, also known as blood diamonds, are diamonds that are mined in war zones or regions[…]

A diamond crown refers to a piece of jewelry, often a tiara or headpiece, that is adorned[…]

The term “diamond crown angle” typically refers to the angle at which the crown of a diamond[…]

The crown height of a diamond refers to the vertical measurement of the crown portion of the[…]

The diamond crown height percentage refers to the ratio of the height of the crown (the top[…]

An internal crystal in a diamond refers to a type of inclusion (a naturally occurring characteristic inside[…]

Cubic Zirconia (CZ) is a synthetic gemstone that is often used as a diamond simulant.

The diamond culet is the flat surface at the very bottom of the diamond, specifically at the[…]

The cushion cut diamond is a popular diamond shape known for its rounded edges and square or[…]

Diamond Cut or Proportion refers to the quality of a diamond’s shape and symmetry, which directly influences[…]

Diamond Cut Grade is a key factor in determining a diamond’s overall beauty and value.

Diamond Cut for Weight refers to the practice of adjusting a diamond’s proportions to maximise its weight,[…]

Diamond depth refers to the measurement of a diamond’s height, from the culet (bottom tip) to the[…]

The diamond depth percentage is a key measurement used to evaluate the proportions of a diamond.

A diamond is a precious gemstone composed of carbon atoms arranged in a crystal lattice structure, which[…]

A Diamond Bourse (also known as a Diamond Exchange) is a marketplace where diamonds are traded, bought,[…]

Because your diamond when worn naturally attracts grease or oil, they will need periodic cleaning.

The Diamond Dealers Club of South Africa (DDC South Africa) is a prominent organization for diamond professionals[…]

Diamond powder is a finely ground form of diamond that is used in a variety of industrial,[…]

A diamond gauge is a precise measuring instrument used to assess the dimensions and other critical features[…]

Diamond directional hardness refers to the varying hardness levels that diamonds exhibit along different crystallographic directions.

Diamond color dispersion refers to the way light is split into its component colors (a phenomenon called[…]

Do you keep a record of my diamond grading certificate

Diamond durability refers to a diamond’s ability to withstand wear, scratching, chipping, and breaking over time.

Diamond Eight-Cut Faceting (Single Cut Diamond)

The Emerald Cut Diamond is a step-cut diamond known for its elegant, elongated shape and hall-of-mirrors effect.

The Diamond Equivalent Colour Grade (ECG) is a system used to compare the colour grades of diamonds[…]

An extra facet in a diamond is an additional facet that is not part of the standard[…]

An eye-clean diamond refers to a diamond that has no visible inclusions or blemishes when viewed with[…]

An eye-visible inclusion in a diamond refers to an internal flaw or imperfection that can be seen[…]

A faceted girdle in a diamond refers to a girdle that has been polished and cut into[…]

A facet is a flat, polished surface on a diamond that interacts with light to create brilliance,[…]

Fancy coloured diamonds are natural diamonds that exhibit intense colours beyond the typical white or colourless range.

A fancy shape diamond is any diamond cut other than Round Brilliant.

A feather in a diamond refers to a type of inclusion that resembles a small crack or[…]

Diamond finish refers to the overall quality of the diamond’s cut, polish, and symmetry.

Fire refers to the dispersion of light into the various colors of the rainbow when light passes[…]

A fish eye is a type of optical flaw that can occur in diamonds, affecting their appearance[…]

The flash effect in a fracture-filled diamond refers to the dispersion of light and the sparkle that[…]

A flat cut diamond refers to a diamond that has a shallower cut, where the crown (the[…]

Flawless is a clarity grade used to describe diamonds that have no visible inclusions (internal flaws) or[…]

Fluorescence in diamonds refers to the glow that a diamond emits when exposed to ultraviolet (UV) light.

The Four C’s are the standard criteria used to evaluate and grade diamonds.

A fractured diamond refers to a diamond that has an internal fracture, often called a fracture or

Fracture filling is a treatment used to improve the clarity and appearance of diamonds that have visible[…]

Only about 20% of mined diamonds are of gem quality, meaning they meet the necessary standards for[…]

Gemmology is the scientific study of gemstones, encompassing their identification, evaluation, grading, and authentication.

The girdle helps protect the diamond from chipping and damage, particularly along its edges. A properly proportioned girdle[…]

Girdle thickness refers to the width of the diamond’s girdle, which is the outer edge separating the[…]

A grading report, also known as a diamond certificate, is an official document issued by a recognised[…]

The term “grainer” is used in the diamond industry to describe a diamond’s weight in quarter-carat (0.25[…]

Graining refers to faint wavy, hazy, oily, or shadow-like lines that can appear inside a diamond or[…]

A green diamond is a diamond that exhibits a natural green body colour, making it one of[…]

Hardness refers to a material’s resistance to scratching or abrasion. When it comes to diamonds, this property[…]

The head of a pear cut diamond refers to the wider, rounded end of the stone, which[…]

The heart cut is one of the most romantic and symbolic diamond shapes, often chosen for engagement[…]

The term Hearts & Arrows refers to a distinct and beautiful pattern that appears in some high-quality[…]

Hot laser inscription refers to the process of using a high-powered laser beam to inscribe a number,[…]

How do I know that my diamond certificate

How do slight differences in the 4C’s affect a diamond’s value?

HPHT treatment refers to a method used to alter or enhance the colour of diamonds through the[…]

In the diamond grading system, hue refers to the specific colour or shade that a diamond displays,[…]

I have a diamond “valuation,” is this not the same as a diamond certificate?

I have a diamond ring with a total diamond carat weight of 1.5 carats in small diamonds.

I want to get a diamond certified before I buy it, what should I do ?

The term Ideal Cut refers to a diamond that is cut with proportions and angles that maximise[…]

how do I know that the diamond in my ring is the one described on the diamond certificate

diamond certificate or diamond grading report

An Indented Natural refers to a specific type of natural feature found in diamonds. It is a[…]

An Independent Laboratory refers to a diamond grading or certification laboratory that operates autonomously.

An Industrial Grade Diamond refers to a diamond that does not meet the standards required for use[…]

The International Diamond Council (IDC) is a global organisation that was established to create and maintain standardised[…]

The International Diamond Manufacturers Association (IDMA) is a global trade organisation that represents the interests of diamond[…]

Internationally recognised standards in diamond grading refer to a set of rules, guidelines, and processes that are[…]

Irradiated diamonds refer to diamonds that have undergone a treatment process designed to change or enhance their[…]

Is it easy to read colour, clarity, carat weight and shape on a diamond grading report?

The Jewellers Association of Australia (JAA) is the leading trade association for professionals and businesses in the[…]

The Kimberley Process (KP) is an international certification scheme established to prevent the trade in “blood diamonds,”[…]

Kimberlite is an igneous rock, typically blue or green in colour, from which most diamonds are mined.[…]

A knot is a specific type of inclusion found within diamonds. It refers to an included crystal[…]

Laser drilling is a treatment used to enhance the apparent clarity of a diamond by reducing the[…]

Life in a diamond refers to the vivid, dynamic quality that gives the diamond its captivating brilliance,[…]

A loose diamond refers to a diamond that is not yet set in any type of jewellery.[…]

A diamond loupe is a small, handheld magnifying lens that is an essential tool for examining diamonds,[…]

The lower-girdle facets are crucial elements in the overall symmetry and brilliance of a diamond.

The diamond make refers to the overall quality of the cut of a diamond, evaluating how well[…]

The marquise cut is a diamond shape that is elongated and features two pointed ends, creating an[…]

A Master Set is a collection of certified and registered diamonds that serve as a reference point[…]

Melee diamonds are small, polished diamonds that typically weigh less than 15 points (0.15 carats) each.

A milky diamond refers to a gemstone that exhibits a cloudy or hazy appearance, which results in[…]

The Mohs Scale of Hardness is a qualitative scale that ranks minerals based on their ability to[…]