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Gold pricing and ZAR exchange explained
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Gold pricing and ZAR exchange explained
The price of 1 gram of gold in South Africa depends on the international spot price, the ZAR/USD exchange rate, and the karat purity of the specific gold you hold.
Gold is priced internationally in US dollars per troy ounce. South African buyers and sellers convert that figure using the daily ZAR/USD exchange rate set by the South African Reserve Bank. The karat purity of the gold then determines what fraction of the gram is pure gold and what fraction is base metal alloy. A gram of 18-karat gold contains 75% pure gold. A gram of 9-karat gold contains only 37.5%. These two figures multiply to give a gram's market value.
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Short answer
The price of 1 gram of gold in South Africa depends on the international spot price, the ZAR/USD exchange rate, and the karat purity of the specific gold you hold.
Gold is priced internationally in US dollars per troy ounce. South African buyers and sellers convert that figure using the daily ZAR/USD exchange rate set by the South African Reserve Bank. The karat purity of the gold then determines what fraction of the gram is pure gold and what fraction is base metal alloy. A gram of 18-karat gold contains 75% pure gold. A gram of 9-karat gold contains only 37.5%. These two figures multiply to give a gram's market value.
Use this rule
Do not judge one C alone. Read the certificate, inspect the actual stone, then decide whether beauty, budget, or resale confidence matters most.
How to calculate the gold price per gram
The international gold spot price is quoted in USD per troy ounce. One troy ounce equals 31.1035 grams. To find the USD value per gram, divide the spot price by 31.1035. Then multiply by the prevailing ZAR/USD exchange rate to get the ZAR value per gram of pure gold. Finally, multiply by the karat purity fraction to find the value of the specific gold you hold. Worked example formula only: if international gold is USD X per troy ounce and the exchange rate is R Y to the dollar, then 1 gram of pure gold equals (X / 31.1035) 00d7 Y rand. 18-karat is that figure 00d7 0.75, 9-karat is 00d7 0.375. Apply the live spot rate yourself; this site does not publish a live price.
Where to check the gold price in SA
The international spot price is available in real time from gold.org, the World Gold Council's official data portal, and from investing.com's gold spot page. The SARB publishes daily indicative exchange rates at resbank.co.za. JSE gold futures data is available via the JSE's public market data pages. These three sources together give a reliable SA gold price calculation without relying on third-party aggregators of uncertain update frequency. The relevant rate for gram pricing is the ZAR/USD spot rate, not the forward rate.
Why SA websites cannot publish a live gold price legally
South African law regulates the purchase and sale of precious metals under the South African Diamond and Precious Metals Regulator framework and the SARB's licensing requirements for precious-metals dealers. Operating as a live pricing feed for gold transactions requires regulatory authorisation. General-purpose websites that display a 'live gold price' without that authorisation are either displaying delayed data from international sources, not facilitating regulated transactions, or operating outside compliance. This site does not publish a live regulated gold price. For a real transaction, use an authorised precious-metals dealer or a licensed bank.
Gold jewellery versus gold scrap: what Prodiam handles
Prodiam is a natural-diamond specialist, not a gold-scrap buyer. If you hold diamond-set gold jewellery and want a valuation, Prodiam can value the diamond component of the piece. The gold setting's value is typically assessed separately by a precious-metals dealer or a bank's gold desk. For a ring containing a 1-carat diamond in an 18-karat gold setting, the diamond drives the majority of the value in most cases, and that component is Prodiam's area of expertise. Book a by-appointment valuation at Suite F1W6, The Paragon, 1 Kramer Road, Bedfordview via sales@prodiam.co.za or +27 11 334 9010.
Decision table
Use the details, not a shortcut.
| Gold karat | Purity percentage | Pure gold per gram | Common use |
|---|---|---|---|
| 24 karat | 99.9% | 0.999g per gram | Bullion, investment bars, coins |
| 18 karat | 75.0% | 0.75g per gram | Fine jewellery, engagement and wedding rings |
| 14 karat | 58.3% | 0.583g per gram | Jewellery; common in US and Europe |
| 9 karat | 37.5% | 0.375g per gram | Fashion jewellery, lower-cost items |
| Gold-filled | Variable (surface layer only) | Minimal | Not solid gold; core is base metal |
Direct answers
Common questions
What is 1 gram of gold worth in South Africa today?
The value changes daily. Divide the international spot price (USD per troy ounce) by 31.1035 to get USD per gram, then multiply by the current ZAR/USD rate from resbank.co.za. Multiply that by the karat purity fraction to get the value of your specific gold. Gold.org and investing.com carry the spot price.
Is 9-karat gold worth significantly less than 18-karat?
Yes. Nine-karat gold is 37.5% pure versus 75% for 18-karat, so at the same spot price and exchange rate, an 18-karat gram is exactly double the pure-gold value of a 9-karat gram. The difference is substantial for any meaningful weight of gold.
Where does SARB publish the daily ZAR/USD rate?
The South African Reserve Bank publishes daily indicative exchange rates at resbank.co.za under its market data section. The rate is updated on business days. Use the spot rate, not the forward rate, for gram pricing.
Can I sell gold jewellery at the spot price?
No. Buyers of gold jewellery factor in melting costs, assay fees, and their own margin. You will receive a percentage of the calculated melt value, not the full spot price. For pieces where the diamond content is significant, a specialist diamond valuation will often return more than selling the piece for gold content alone.
What is the difference between a diamond carat and a gold karat?
They are entirely different units. A diamond carat is a unit of weight: 1 carat equals 0.2 grams (200 milligrams). A gold karat is a measure of purity on a 24-part scale: 18 karat means 18 out of 24 parts are pure gold. The two uses of 'carat/karat' are unrelated.
Does Prodiam buy gold jewellery or gold scrap?
No. Prodiam is a natural-diamond specialist, not a gold-scrap dealer. It can value the diamond component of gold-set jewellery during a by-appointment consultation. For the gold itself, contact an authorised precious-metals dealer or a licensed bank gold desk.
When to involve a specialist
If there is a real diamond, the next step is a certificate-led conversation.
Bring the grading report, photos, invoices, valuations, and any estate paperwork. The goal is to move from generic advice to a stone-specific view.
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