24K vs 21K vs 18K Gold: Purity, Price and Which to Buy

Every gold shop board in Egypt lists several karats, and the gap per gram is significant. Which one you should buy depends on your goal: storing value, buying an engagement set (shabka) that will be worn for years, or choosing a ring with stones you will wear every day. Here is what actually differs between them.

What karat means

Pure gold is very soft; it scratches and bends easily. Jewelers alloy it with metals such as copper and silver to make it workable and durable. Karat expresses gold content out of 24 parts. 21K means 21 of 24 parts are gold, or 87.5%, stamped 875 in the hallmark. 18K means 75%, stamped 750. 24K is effectively pure, stamped 999 or 999.9.

Comparison table

The prices above are only illustrative. Check today's gold price for current figures for each karat.

How karat prices relate to each other

Each karat's gram price is anchored to the 24K price in proportion to its gold content:

Market prices can drift slightly from this ratio with supply and demand, but it is the basis. An 18K gram is cheaper not because it is lower quality, but because it contains less gold.

24K: for saving, not for wearing

24K is the choice for storing value. Bars and gold coins generally carry much lower making charges than jewelry, so more of your money goes into the metal itself, and the spread between buying and selling is usually narrower. The drawback is softness: it is a poor fit for rings or bangles worn daily.

21K: Egypt's standard for jewelry

21K dominates Egyptian bridal sets, bangles and chains. Its high gold content gives a rich color and holds value, while the alloy makes it tough enough to wear. Because it is the most traded karat in the country, it is also the easiest to sell or exchange at almost any shop.

18K: for stones and everyday wear

18K is the hardest of the three because of its higher alloy content, so it holds stones and diamonds securely. It also allows white and rose colors that are difficult in higher karats. The gram price is lower, but set pieces tend to carry higher making charges plus the cost of stones.

Example: the same budget in three karats

18K gives you more grams, but less pure gold, and a larger share of the spend goes on making charges that are usually not recovered on resale. For the full method, read how to calculate gold price with making charge.

Which karat should you buy?

• Saving or investing: 24K bars or coins, for lower making charges and a narrower resale spread.
• Bridal set or jewelry you will keep and may sell later: 21K, a good balance of value, durability and liquidity.
• Stone-set ring, daily wear, or white/rose gold: 18K.

Resale value

When you sell, a shop pays the buying price per gram for that karat and the making charge is generally not returned. That is why heavily worked pieces lose more if sold soon after purchase. See the numbers in selling and exchanging used gold.

For shop owners

Each karat needs its own price and its own stock ledger. In GoldCore you set or sync the 24K price and the 21K and 18K prices follow, updating the POS, the online store and the in-store price screen at the same moment. Learn more about live gold pricing in GoldCore or start a free trial.