The data

Two 10 g items can contain different amounts of gold

Illustrative calculation — not observed data

At the same gross weight and 18K purity, 2 g of stones displaces 1.5 g of pure-gold content. Ask for metal weight, not just total weight.

Data source · WHIUAE guide and cited references Source: What's Hot in UAE
Methodology

Pure gold = 75% of alloy weight. Fictional items; excludes making charges and is not a valuation.

Read chart data
Two 10 g items can contain different amounts of gold · An em dash indicates a missing observation.
Comparison Pure gold Other metal Stones
Alloy only 7.50 2.50 0.00
With 2 g stones 6.00 2.00 2.00