Pearls,Wholesalers,Sydney,Australia,Precious,Gems,Opals,Gold,Jewellery
 

Diamonds

We offer diamonds at fair prices giving you the choice of preference to GIA certified diamonds where possible. GIA Certification reports can be checked and verified on their website and carry a premium and worldwide recognition. Some of the GIA certificated diamonds are laser inscribed with the certificate numbers on the girdle. These diamonds do have an additional inbuilt cost premium depending on supply and demand.

For your choice of diamonds, please fill out the enquiry form or call us on +61 2 9235 1677.
1. Please view http://www.unigem.com.au/trade/diamondsunmounted/ for our unmounted diamond collection instock - 1st February 2008.
2. Please view http://www.unigem.com.au/trade/diamondringsandpendants/ for our ring and pendants collection instock - 1st February 2008

 
 

When buying a diamond our expertise can guide you through the importance of the 4C’s selection criteria – colour, carat, clarity and cut – along with all other precautions and verifications necessary. We guarantee that the diamonds we sell have not undergone any form of colour enhancement or advanced treatment processes, such as laser drilling and fracture filling techniques, which are often used to make low cost diamonds more marketable. GIA does not issue certificates on such stones. On principal we decline from selling treated diamonds, although it is a common practice for some dealers to trade such goods, with disclosure, at lower prices. We have access to the best diamond stock in Australia through long standing connections with international sources. Our clients can buy with confidence.

COLOUR plays a major role in determining the quality of a diamond. A diamond acts as a prism, dividing light into a spectrum of colours and disperses this light as colourful flashes called 'fire'. 'White' diamonds, although appearing colourless, can have slight tones of yellow and brown. As these tones become more easily apparent, the rarity and value of the diamond decreases. D is the highest grade and indicates a completely colourless diamond. J-K are slightly tinted white - Z indicates a strong yellow tinge.

Strongly coloured diamonds called 'fancies' have colours ranging from intense yellow through to blue, green, pink and red. These diamonds are extremely rare and valuable. View the file below for the colour chart.

Detecting Treated Diamonds 

Detecting Synthetic Diamonds
 

CARAT the weight of a diamond is always expressed in carats (one carat equals 200 milligrams). This is further broken down into points, 100 points equals one carat. Diamond weight is always recorded to 2 decimal places in carats, or as the number of points. For example, a half carat stone can be described as 0.50ct or 50 points. Please view the file below for more details.

CLARITY or purity of diamonds is determined according to the effect that inclusions and marks have on the appearance of the stone when viewed face up at 10x magnification. The size, colour, number, location and general visibility of any internal inclusions or external markings are taken into account in determining the clarity grade of the diamond. Inclusions are ranked on a scale of perfection, ranging from FL (Flawless 0 no internal or external inclusions visible under x10 magnification) to P (Pique) or I (Included) inclusions visible with the naked eye. If the inclusions are not visible to the naked eye, the diamond is deemed 'eye clean'. The position of inclusions is important in choosing a diamond. Some inclusions at or near the edge, can be hidden by a mount and therefore have a lesser effect on the beauty of a diamond. An inclusion in the middle or top of a diamond, however, could be more visible and have more impact on its appearance making the diamond less attractive.

CUT (or 'Make') of a diamond is a most important feature. Cut refers to the angles and proportions a skilled craftsman creates in transforming a rough diamond into a polished diamond and is not a reference to the shape of the stone. Even if a diamond has the highest colour and clarity, a poor cut will result in the diamond having dulled brilliance.

A well proportioned diamond follows strict mathematical proportions. The light entering the diamond from the top will be internally reflected from one facet to another within the diamond before being refracted back through the top, and returned to the eye of the observer, giving the stone maximum brilliance, scintillation and fire. A diamond can be cut to retain maximum weight and to create the illusion of size, but this results in a loss of brilliance. If cut too deep, light will escape through the bottom facets and the centre of the diamond will appear dark. If the stone is cut too shallow, the light will also escape through the bottom facets, giving the diamond a glassy watery appearance. A well cut diamond will internally reflect light from one facet to another and disperse and reflect it through the top of the stone, maximising the brilliance as well as the fire of the stone.