First identify what the price represents.
A price needs an instrument, a unit and a currency before it can be used. A gold price per troy ounce does not become a silver price because an item happens to be in the same tray. A USD observation is not an EUR observation with a different currency sign.
Troctolite’s current production calculation and manual quote maintenance support XAU gold. Dedicated silver, platinum and palladium calculations remain planned. The public browser example can illustrate sterling, but that sample is not a production multi-metal capability.
Check the item’s primary material and the selected alloy before using a quote. Known non-gold records are blocked from the gold valuation path. Unknown primary fields remain unknown; choosing a gold calculation is an operator decision, not authentication.
Observation time and entry time answer different questions.
Observation time tells you when the source price was seen. Entry time tells you when it was recorded in the app. Entering an old observation now should not make it current. A useful history shows both, together with the validity window.
Managers, administrators and owners can append a manual quote for their active location and currency. Authorized staff can read the current record and history. A source name and an explicit UTC observation make the basis inspectable; manual entry is not a licensed feed.
The current manual quote window is one to sixty minutes. A future observation is not yet valid; expiry is stale at equality. Appending an older observation does not restart its market age.
Trace the unit conversion before the buying factor.
For a gold calculation, first distinguish gross piece weight, non-metal deduction and alloy purity. The remaining alloy weight multiplied by the purity fraction gives the fine-metal weight attributed to the calculation. Troy-ounce pricing then requires the corresponding conversion.
A karat label is a shortcut for a purity choice. A stone deduction is a weight assumption, not a stone valuation. Recovery assumptions, refiner discounts and fees are further inputs; they should not be hidden inside a supposedly pure market quote.
Use the interactive example to change grams, dwt, troy ounces and purity. Every displayed price is illustrative. The exercise is to see which operand changes a result, not to obtain a current quote.
Preserve the old quote when making a new decision.
An earlier estimate can still be understandable after its quote expires. The saved calculation should retain that source and timestamp. A separate current comparison can show how the same saved inputs behave at a newer quote, where the currencies match.
The buying desk can explicitly refresh its working quote without replacing the original record. New neutral saves freeze their own basis. A revision continues a known estimate family; an independent estimate stays a separate decision.
If the quote changes before a save, the current UI asks for review and preserves the draft. An accepted uncertain save is recovered under the original request identity, even if the quote later changes. Keep that page open to use its recovery request.
A saved calculation is not execution permission.
A fresh quote is one condition in a buying workflow. It does not establish seller identity, ownership, supported reporting, an approved payout method or the required stock hold. Those are separate requirements.
Troctolite keeps unsupported regulated production execution disabled. Its isolated execution tests check freshness again around lock waits and bound new unsigned proposal validity by the quote. Those tests are not a claim that a shop’s jurisdiction and operator setup are ready.
When evaluating a system, ask it to reopen an expired quote, show the original basis and attempt a new action. The useful result is a clear review path with no duplicate payment, silent repricing or accidental release of stock.