Precious Metals Tswane trades in a variety of diamonds and precious stones. We are experts in evaluating and locating the best diamonds at competitive prices. Our diamonds are responsibly sourced and abide by national and international law. Now is a good time to invest in diamonds. We have a range of diamonds in stock, which have been hand-selected by our expert team and graded for their cut, colour, clarity and carat weight.

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Buying Diamonds

Contact Us to buy your diamonds and precious stones. Once we have received payment, we will arrange secure courier delivery to you within 24 hours.

Diamond Sizes

View a chart of our diamond sizes by carat weight and size in millimetres for round brilliant, princess, cushion, oval, emerald, heart, pear, marquise, asscher, radiant, baguette and trillion cut diamonds.
Diamond Size Chart


Yes, if you buy from a reputable vendor.

Buying diamonds is a secure substitute for hard currency as they increase in value. They are also easy to store safely as they are small.

The 4Cs – cut, colour, clarity and carat weight – are the most important considerations to determine the worth of a diamond.

Yes. You will often find that buying a diamond online is cheaper than retail.

Diamonds bought from us are shipped within 24 hours of payment.

Fancy shaped diamonds can cost you significantly less than a round brilliant diamond of the same carat size. The reason being that less of the rough diamond is discarded in the cutting process of a round brilliant diamond.

In diamonds under 1 carat, clarity should be considered the least important of the 4Cs. Brilliant-cut diamonds (such as round, princess, cushion, oval, pear, and marquise) hide inclusions better than step cuts (emerald and asscher).


The 4Cs stand for colour, clarity, carat weight, and cut. They make up a grading system that determines the quality and price of a diamond.


Many people confuse cut with the shape (e.g. round or princess) of a diamond. The shape of the diamond is a matter of personal preference and does not directly affect the value. Cut refers to how well the stone is faceted, proportioned, and polished. A good cut will result in better brilliance, which is why it is the most important of the 4Cs. If a diamond is poorly cut, the diamond will look dull and glassy. It is the work of a master cutter that allows the diamond to be cut in such a way as to permit the maximum amount of light to be reflected through the diamond. The cut is the only diamond component not influenced by nature.


Colour is the second most important factor to consider when buying a diamond. Ideally, a diamond would have no colour, however, chemical impurities or structural defects do exist which affect the colour. It is important to distinguish the normal range of ‘white’ diamonds from ‘fancy’ colour diamonds. Diamonds range in colour from faint yellow or brown to rare pinks, blues, greens, and other colours are known as “fancies”.


The clarity of a diamond relates to the amount of natural internal imperfections (inclusions) and blemishes (surface defects) present. Inclusions are liquids, solids or gases trapped in the mineral as it formed. Clarity refers to the relative absence of inclusions and blemishes.


Carat refers to the actual weight of the diamond. The larger the carat, the more expensive the diamond. Carat size is divisible by 100 points of two milligrams each.