Real gold is a dense metal heavier than most other metals of the same size. This means that gold jewelry will typically feel heavier in hand than a piece made from a lighter metal such as silver or titanium.
The weight of gold is usually measured in troy ounces or grams, and the importance of a piece of gold jewelry can vary depending on the purity of the gold, the size and design of the piece, and other factors. For example, a 14k gold chain may weigh less than a similar chain made from 18k gold, as 14k gold contains a lower percentage of pure gold.
In general, real gold jewelry should feel relatively heavy for its size due to the high density of the metal. However, some fake gold jewelry may be weighted or plated to make it look like real gold, so it is always best to consult with a professional jeweler or appraiser to determine the authenticity and value of a piece of gold jewelry.