The key point
Compare stones and jewelry without relying on an invented universal price per carat.
Start with a specification
A quote means little until you know whether it covers rough, a polished cabochon, a matched set, or finished jewelry. Ask for the unit of sale, exact dimensions, weight, condition, and disclosure. A price per gram for rough cannot be compared directly with a price per carat for a finished stone.
Compare the complete item
For loose stones, consider appearance, dimensions, finish, and suitability for the setting. For jewelry, include metal, construction, stone security, chain or findings, and workmanship. Two pendants with similar blue stones can represent different products when these details are included.
Convert units carefully
One carat equals 0.2 grams; five carats equal one gram. Check whether weight refers to the gemstone alone or the complete piece. A metal setting changes the meaning of total weight. Gross rough weight is not a promise about the weight of finished stones that can be produced.
Calculate delivered cost
Request a quote separating goods, shipping, insurance if offered, currency, and charges collected by the seller. Import charges may be assessed separately. Compare final cost for your destination and return conditions, rather than only the prominent number on a product tile.
Why a speculative chart can mislead
Without a current representative dataset and consistent grading method, a chart creates false precision. Commercial prices should come from actual inventory or a dated quote. Treat exceptional scarcity stories and promised appreciation as claims requiring independent evidence. We do not promise investment returns or resale liquidity.
About this guidance
This guide provides practical purchase questions, terminology, or clearly labeled interpretation. It does not claim laboratory testing, field observation, current market research, or independent expert review.
Our initial library was developed with AI assistance. Product claims require separate item-specific evidence. Read our editorial standards.