Our jewellery can be made in any of the following metals: 
(Some collections are only available in gold and platinum)

sterling silver – hallmark: 925
sterling silver with 22 ct gold in the etch – hallmark: 925 
9ct white gold with  22ct gold in the etch – hallmark:375 
18ct yellow, red or white gold – hallmark: 750 
Platinum – hallmark: 950 

As a mark of authenticity and a guarantee of quality, all Diana Porter jewellery is hallmarked in accordance with current legislation.

Each item is tested before being stamped with a fineness mark - Edinburgh Assay Office's castle mark and Diana Porter’s DP.

We are proud to be able to offer our customers Fairtrade gold and helping it become established in the UK jewellery industry. The Fairtrade "rubber-stamp" makes sure that the paper-trail goes back to the artisanal miners for every piece of jewellery created. Each piece made in Fairtrade gold will be stamped on the inside with the Fairtrade stamp . To learn more about Fairtrade gold click here




Most of the diamonds we use are brilliant or round cut. The brilliance of a diamond is determined by the precision with which it is cut. Perfect proportions allow light to reflect internally and disperse through the top of the diamond, giving it that unmistakable sparkle. Here are some of the other cuts:

We also use a range of rough cut diamonds and rose cut diamonds; each stone is unique. They are not graded in same way as traditional diamonds, but are chosen for their individuality and aesthetic qualities.


The size of a diamond is determined by its carat weight. History suggests a ‘carat’ was equal to the weight of a single carob bean, used in the past when gemstones were traded. Diamonds today are described in carats and points. A one carat (1ct) diamond equates to 100 points, so a 1/2 carat (.50ct) equals 50 points. One carat weighs 0.2gms.


Gemmologists determine the clarity of a diamond by the number and type of inclusions seen through x10 magnification. Clarity grading ranges from internally flawless stones (FI/IF) to those that have tiny inclusions which can just be seen by the naked eye. Diana Porter uses diamonds of VS1 clarity and above.


Diamond colour is graded from D (colourless) to Z (tinted) using the international colour grading scale as reference. The closer a diamond is to colourless, the rarer and more valuable it is. At Diana Porter all our diamonds are F colour and above.

Coloured diamonds are those which have a strong, even colour such as yellow, pink or blue. These are referred to as ‘fancy diamonds’ and are extremely rare.

We use a large array of natural brown diamonds, called Cognac or Champagne diamonds. They are a lovely alternative to the classic white diamond, but each one is unique and the exact colour cannot always be matched.

Lab-Grown Diamonds 

Aside from the above options, we can also supply lab-grown diamonds as options for you to consider if you wish to look into alternatives to natural mined diamonds. 

Certification of Diamonds

Some of the larger diamonds come with a report from the Gemological Institute in Antwerp or we can obtain a report and certification from the Birmingham Assay Office for a small charge.

Since the Kimberly Process was launched in 2002, we have been committed to supplying conflict free stones. All diamonds sold by Diana Porter are conflict free diamonds.

We are also able to source fair-trade semi-precious stones. Please contact us for more details.