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100 Gems - October birthstone opal
| Issuer | Mexico |
|---|---|
| Year | 2023 |
| Type | Fantasy banknote |
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| Obverse description | Art Nouveau-style vignette of a seated female figure with flowing auburn hair raising a luminous green opal sphere in her hands, set against a warm reddish-brown guilloche underprint. A central inset gemstone ornament with the chemical formula SiO2·nH2O appears at centre-right, flanked by a designer and cashier signature line. The denomination 100 / CIEN appears at lower centre. |
|---|---|
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| Reverse description | Art Nouveau vignette of a standing female figure in flowing robes, holding a fire opal in her raised right hand, occupying the left two-thirds of the note against a pale warm guilloche background. To the right, a terracotta-coloured silhouette map of Mexico appears below a crossed-hammer mining tools vignette, with the denomination numeral 100 at lower right. |
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| Comments |
Mexico's Banco de México has issued collectible polymer notes under the "100 Gems" program highlighting gemstones with cultural or geological significance to the region. Opal is a reasonable choice — Mexico is among the world's leading opal producers, with deposits in Querétaro state mined since pre-Columbian times and still commercially active today.
These are legal tender collector issues, not intended for general circulation, and the polymer substrate was chosen to allow printing effects that paper cannot achieve with translucent or iridescent stones as subject matter.