A per-ounce comparison of Gold and Silver spreads hides the real cost gap between the two metals once contract size is factored in. Silver's tighter bid-ask spread turns into a far larger cost per lot than Gold's, and that gap can widen further when liquidity shifts around news events.
Silver's spread looks like the cheaper trade at first glance, but the math flips once contract size enters the picture: the spread cost on one lot of XAG/USD ran to roughly $70, versus about $4 for one lot of XAU/USD, according to an analysis of commodity trading costs published on Investing.com.
Per-ounce prices mislead on cost
At one snapshot cited in the analysis, XAU/USD quoted a bid of $4,351.66 against an ask of $4,351.70, a $0.04 spread, while XAG/USD quoted a bid of $64.172 against an ask of $64.186, a $0.014 spread. Silver's per-ounce spread looks smaller than Gold's.
But contract size changes the picture: according to contract specifications from IUX, one lot of XAU/USD equals 100 troy ounces, while one lot of XAG/USD equals 5,000 troy ounces. Multiplying each spread by its lot size produces the roughly $70-versus-$4 gap. A smaller spread per ounce does not mean a lower cost per lot.
Spreads widen when liquidity thins
Spreads are not fixed. As market conditions shift, the bid-ask gap can widen with changes in liquidity, volatility, and trading demand. During session transitions and just before major economic releases, spreads on both metals can widen, especially when volatility rises sharply or the market enters a repricing phase.
That matters most on short timeframes such as M1 and M5, where even a small shift in spread can become significant if a day trading strategy is targeting a very short price move. Some platforms display only the bid price by default, so a widening spread can push the ask price into a short position's stop-loss even when the bid appears untouched on the chart.
Traders comparing the two metals on short timeframes can weigh the spread against the expected price range rather than the spread alone, since Gold typically shows higher intraday price activity than Silver.
Source: Investing.com
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