I'll be happy to answer any question. Please, feel free to ask.
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This is a superb 18 carats gold Holy Cross pendant.
French gold marks "tête d'aigle".
Decorated with black enamels and opals.
Dimensions: 5 x 2,7 cm
Total weight: 6,3 grammes ( rather heavy in hand ).
Period: 1850 - 1870
Perfect condition.
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Here is a converter inches / cm to help you with the dimensions.