How is the gold price computed for this country?
We start with the live XAU/USD spot price (the international gold market quotes one troy ounce of 24K bullion in US dollars). We divide by 31.1035 to get the per-gram USD price, then multiply by the live USD-to-IDR exchange rate to convert it into Indonesian Rupiah. Finally we multiply by the karat purity (0.9999 for 24K, 0.9167 for 22K, 0.875 for 21K, 0.75 for 18K, 0.5833 for 14K) to get the per-gram price for each karat level.
Karat reference — what does 24K, 22K, 18K actually mean?
Karat (sometimes spelled 'carat') measures gold purity in 24ths. So 24K is theoretically 24/24 = 100% pure gold (in practice 99.99% — true 100% is impossible). The other karat levels follow: 22K = 22/24 = 91.67%, 21K = 21/24 = 87.5%, 18K = 18/24 = 75%, 14K = 14/24 = 58.33%. The non-gold portion is alloy — usually copper, silver, or palladium — added to make the metal harder and easier to work with.
- 24K (99.99%) — Investment-grade bullion. Soft, ductile, wears easily — used for bars, coins, and high-end ceremonial jewellery in the GCC.
- 22K (91.67%) — Most popular jewellery grade in the GCC, India and Pakistan. Excellent gold-to-durability balance.
- 21K (87.5%) — Saudi Arabia and Egypt jewellery default. Slightly harder than 22K, retains a deep yellow colour.
- 18K (75%) — Western jewellery standard (Italy, France, Switzerland, US fine jewellery). Sturdy, holds gemstones well.
- 14K (58.3%) — US mass-market jewellery default. Hardest, most affordable, lighter yellow tone.
What moves the gold price in 2026?
Globally: central-bank reserve buying (1,100+ tonnes in 2024, ongoing in 2025–26), Fed rate-cut expectations, real US yields, dollar strength, and geopolitical risk premia. Locally: the country's currency strength against the dollar amplifies or muffles the move. When the local currency weakens, gold becomes more expensive in local terms even if the dollar price is flat.
Buying-tip: When buying jewellery in Indonesia, weigh the piece on a calibrated scale and verify its hallmark. First calculate the metal value (weight × the relevant per-gram karat price), then add the applicable local tax, dealer premium and making charge. Ask for each component on the invoice.
Trading XAU/USD as a forex CFD
Beyond physical jewellery and coins, gold is also a major forex CFD — XAU/USD is the most-traded commodity pair worldwide. You can take long or short positions with leverage on regulated brokers (XM, HFM, FXTM, Pepperstone). This is a derivative, not physical bullion — you settle in cash, not metal. Read our Gold Trading guide for risk-management essentials before opening a position.