Italian Tour hand carved lava Goddess Cerere (Ceres) cameo. Unmarked 10K Yellow Gold Brooch. Circa 1870

Greatly carved Victorian Lava stone - image of Cerere (Carved on the back of cameo) - Goddess of Fertility & Harvest. From a Italian Tour. The brooch total measurements is 38 mm. by 35 mm. No hallmarks - which is normal for this period cameos. This is 10K Yellow Gold according to seller description. But I’m not 100% sure about it. This is the reason why I put it in the not solid Gold collection. Total weighs 12.2 grams. Circa 1870 or earlier. For 150 y.o. - the good Antique condition.