The Gemstones & Jewellery Atelier

Authentication & Certification

Authentication & Certification | Reebonz
The Importance Of Diamond Authentication & Certification:
  • A diamond certification includes all the details and qualities of the diamond. This would include the diamond's 4C's (clarity, cut, colour and carat), any internal and external characteristics the diamond may possess, proportion perimeters, colour grade, weight and whether the diamond has undergone any clarity or colour enhancement.
  • A diamond certification is issued by a gemological laboratory. This unbiased analysis of the diamond determines the rarity of the diamond, provides detailed information for future identification and a recommended insurance replacement value. This is the amount that the insurance company will pay you to repair or replace your damaged or lost item.
  • A diamond appraisal is designed to offer you a market value for all purposes.

The Importance Of Gemstone Authentication & Certification:
  • Colour is the most important attribute in every gemstone. Gems come in every colour of the spectrum, but one gem specie can have a variety of different hues, tone and intensity to suit your expectations and preferences.
  • A gemstone's clarity is affected by its characteristics, and have impact on the transparency and brilliance. Such characteristics sometimes depict its origin.
  • Characteristics such as colour, transparency, shape, cut, dimensions and weight are the basic requisites in the valuation process. Aside from such information, it is important for gemologists to analyse if the material is natural and if it has been treated to enhance its appearance.

Reebonz aims to put your mind at ease when it comes to making a purchase with us. We guarantee the authenticity of every item listed. Put under the most rigorous testing to meet the highest standards of quality, all our products are closely examined by our professional Reebonz Atelier team before they are issued a Reebonz Atelier Authenticity Card.

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Grading, Appraisal & Valuation

Grading, Appraisal & Valuation | Reebonz
About The 4CS

Since the 1940's, there has been an internationally recognized grading system to objectively compare and evaluate the quality of diamonds.

Diamonds and other gemstones are weighed in metric carats, one carat is equal to 0.2 grams, about the same weight as a paperclip. The majority of diamonds used in fne jewellery weigh one carat or less. Even a fraction of a carat can make a considerable difference in pricing a diamond. To ensure high levels of precision, weight is often measured to the hundred thousandths of a carat, and rounded to a hundredth of a carat. Big diamonds are a rare occurrence, so when considering diamonds of equal quality, rarer larger stones will have considerably more value.

White diamonds are valued by how colourless they are – the less colour, the rarer, the higher the value – and such colours are often invisible to the untrained eye. While fancy-coloured diamonds such as yellows, pinks and blues are exceptions to this rule. Most diamonds found in jewellery stores run from colourless to near-colourless. GIA’s colour-grading scale for diamonds is the industry standard and begins with the letter D, representing colourless, and continues with increasing presence of colour yellow, grey or brown to the letter Z. Diamonds are colour-graded by professionals by comparing them to master stones of known colour under controlled lighting and precise viewing conditions.

As diamonds are formed deep within the earth, under extreme heat and pressure, they often contain unique birthmarks, either internal (inclusions) or external (blemishes). Diamond clarity refers to the absence of these inclusions and blemishes. Diamonds without these birthmarks are extremely rare, and rarity affects a diamond’s value. Using the GIA International Diamond Grading SystemTM, diamonds are assigned a clarity grade that ranges from fawless (FL) to diamonds with obvious inclusions (I3). Every diamond is unique and none is free from characteristics under 10× magnifcation.

The brilliance, fre and sparkle of a diamond all boils down to its cut. Brilliance is the total light reflected from a diamond, fire is the dispersion of light into the colours of the spectrum, and scintillation (the fashes of light, or sparkle, when a diamond is moved). Cut affects the major components of a diamond – the crown, girdle and pavilion. A widerange of proportion combinations of the these components ultimately affect the stone’s interaction with light.

The standard round brilliant cut is the most commonly used shape and such a diamond has 58 facets, each precisely faceted and defined as small as two millimetres in diametre. All others are known as fancy shapes, and these range from traditional cuts such as marquise, pear, oval and emerald. Hearts, cushions, triangles are popular.

Gemologists And Appraisers

Gemology is the art and science of gemstones. Appraisers have extensive training in grading of gems, and an appraisal involves two primary components. The frst is to authenticate the item using the knowledge gained from studying gemology which include microscopic examination, comparison stones for colour and a variety of gemological equipments for evaluating fuorescence, cutting and characteristics. The second is to assign an appropriate value which is based on the grade obtained, rarity of the gemstone and the current market price.

Repair, Restoration & Customisation

Repair, Restoration & Customisation | Reebonz

Quality Assurance

With an increase in treated and synthetic diamonds in the marketplace, Reebonz Atelier offers tests to determine whether the gem material is diamond or not; natural or synthetic, enhanced; or to identify specific treatments. Results are presented in a table format in the Reebonz Atelier Certifcate.

Customisation and other services are available upon request.
For more information, please drop an email to
eric.wong@reebonz.com