How we value your old diamond jewellery

We carefully grade your diamonds according to the classic “Four C’s” – cut, clarity, colour and carat weight.


A good cut gives a diamond its brilliance.

When a diamond is well-cut, light enters the stone and reflects from one side to the other before reflecting back out of the diamond to the observer’s eye. This light, and its flashing, sparkling effect, is what makes diamonds so mesmerizing.

In a poorly cut diamond, the light ‘leaks’ out from the sides or bottom of the diamond rather than reflecting back to the eye. Poorly cut diamonds lack brilliance.


Natural diamonds are created under an incredible amount of pressure and most diamonds have flaws.

A diamond’s “clarity” is all about the flaws. There are two types:

Blemishes: found on the surface of the diamond

Inclusions: found within the diamond

“Blemishes” are scratches, pits, and chips. Some blemishes occur during the cutting process.

“Inclusions” are flaws such as air bubbles, cracks, and non-diamond minerals found within the diamond.

Diamonds with no or few blemishes or inclusions are rare, and more highly valued and priced.


When jewellers speak of a diamond’s colour, they are usually referring to the absence or presence of colour in white diamonds. Colour is a result of the composition of the diamond, and it does not change over time.

Colourless diamonds allow more light to pass through so have more sparkle. Very few diamonds are truly colourless and they are more valuable.

Coloured diamonds do not follow this rule. These diamonds are very rare and expensive. They can be any colour, from blue to green to bright yellow. They are actually more valuable for their colour.

Fluorescence is a glowing effect seen in some gem-quality diamonds when they are exposed to long-wave ultraviolet light (such as nightclub black lights). Most gemmologists prefer diamonds without this effect, but it is a matter of personal taste.


A carat is a unit of measurement used to weigh a diamond. One carat is equal to 200 milligrams, or 0.2 grams.

The word “carat” is taken from the carob seeds that people once used to balance scales. (These seeds are so uniform in shape and weight that even today’s sophisticated instruments cannot detect more than three one-thousandths of a difference between them.)

Large diamonds have a greater cost per carat and the price of a diamond rises exponentially to its size (e.g., a 2-carat diamond will cost more per carat than a 1-carat diamond of equal grade).

When we value your diamonds at Diamond Dealers, all of these factors are taken into account.

We grade your diamonds according to an international rating scale. (The scales and tables below are a guide only.

Diamond Shape Guide

Round Princess Emerald Radiant Victorian Asscher
Round Princess Emerald Radiant Victorian Asscher
Marquise Oval Heart Pear Trillion Cushion
Marquise Oval Heart Pear Trillion Cushion

Diamond Size Guide

Carat Weight 2.50 2.25 2.00 1.75 1.50 1.25 1.00 .85 .75 .65 .50 .40 .33
Diamond Carat Guide 2.50 Diamond Carat Guide 2.25 Diamond Carat Guide 2.0 Diamond Carat Guide 1.75 Diamond Carat Guide 1.50 Diamond Carat Guide 1.25 Diamond Carat Guide 1.0 Diamond Carat Guide .85 Diamond Carat Guide .75 Diamond Carat Guide .65 Diamond Carat Guide .50 Diamond Carat Guide .40 Diamond Carat Guide .33
MM Width 9.0 8.6 8.2 7.8 7.4 7.0 6.5 6.2 5.9 5.6 5.2 4.8 4.4

Clarity Grading Scale

Diamond Clarity Guide IF Diamond Clarity Guide VVD1 VVS2 Diamond Clarity Guide VS1 VS2 Diamond Clarity Guide SI1 SI2 Diamond Clarity Guide I1 I2 I3
Internally Flawless Very Very Slight Inclusions Very Slight Inclusions Slight Inclusions Imperfect

Colour Grading Scale

Diamond Colour Guide D Diamond Colour Guide E Diamond Colour Guide F Diamond Colour Guide G Diamond Colour Guide H Diamond Colour Guide I Diamond Colour Guide J-K Diamond Colour Guide L-M Diamond Colour Guide N-Z

Once your diamond(s) characteristics have been established, we give you the best wholesale price for your diamond jewellery or stones.

Please note: we are also interested in buying your old gold rings, earrings, bracelets, bangles, brooches, diamond or precious stone jewellery, and we give you the best wholesale cash price for your old gold coins, scrap gold, broken gold.

Call Diamond Dealers today on 570 1511 or visit our Panmure store at 30B Jellicoe Street, Panmure

EzyCash Gold Buyers Auckland
Contact Us

Operating Hours
Mon - Fri: 9:00am - 4:00pm
Sat: 9:00am - 3:00pm
Sun: 10:00am - 2:00pm

30B Jellicoe Road, Panmure
Auckland East
New Zealand

Contact Details
Phone: (09) 570 1511
Fax: (09) 570 1527

Sell Silver Jewellery and Bullion