THE SHORT ANSWER
Treat fine weight, converted grams and physical dimensions as separate evidence
Compare official Gold Libertad fine-gold sizes, .999 fineness, dimensions and the disclosed one-ounce diameter conflict.
OFFICIAL SIZE TABLE
Fine-gold size, converted grams and diameter are separate fields
| Size | Fine grams* | Diameter | Fineness |
|---|---|---|---|
| 1 oz | 31.1035 g | 34.5 mm | .999 |
| 1/2 oz | 15.5517 g | 29.0 mm | .999 |
| 1/4 oz | 7.7759 g | 23.0 mm | .999 |
| 1/10 oz | 3.1103 g | 16.0 mm | .999 |
| 1/20 oz | 1.5552 g | 13.0 mm | .999 |
*Derived from fine troy ounces. Do not substitute this conversion for a published gross mass or a scale reading.
ONE-OZ SOURCE CONFLICT
Use 34.5 mm as the current display value, but preserve the conflict
The current Spanish page and official catalog state 34.5 mm; the official English page states 34.0 mm. The other four diameters agree. Record the source and access date instead of hiding the disagreement.
SIZE DECISION
Normalize the entire order per fine ounce
Fractional coins reduce the cash required for one unit and permit smaller future sales. They can also have wider percentage spreads. Compare delivered cost per fine ounce, same-product bid per fine ounce and the number of pieces you actually need.
Use one payment method, destination and observation time.
FREQUENTLY ASKED QUESTIONS
Mexican Gold Libertad Sizes and Weights questions
How many Gold Libertad sizes are there?
Banco de México lists five core sizes: 1 oz, 1/2 oz, 1/4 oz, 1/10 oz and 1/20 oz.
How many grams are in a one-ounce Gold Libertad?
One fine troy ounce converts to 31.1034768 grams of fine gold. This is a conversion of the stated fine weight, not a separate gross-weight claim.
What is the diameter of a one-ounce Gold Libertad?
The current Spanish Banco de México page and official catalog say 34.5 mm; the English page says 34.0 mm. GoldObserve discloses both.
Are dimensions enough to authenticate a Libertad?
No. Dimensions are screening evidence only and must be interpreted with measurement uncertainty, provenance, design, mass and other tests.
PRIMARY SOURCES
Official records and a visible evidence boundary
- Banco de México Gold Libertad page: current Spanish series chronology, fineness, sizes and diameters.
- Banco de México official numismatic catalog: BU/PF product labels, dimensions and annual-series context.
Sources reviewed August 12, 2026. Verify current availability, the exact coin and transaction terms. No dealer price, mintage, forecast or authenticity verdict is inferred.