The photographs of these two Nancy Cross pendants were sent to us separately by people in the US, but the pendants most likely originate from Europe.
Neither of them have any identification markings on the back, but on the front there is a prominent thistle. The thistle is a symbol of Lorraine and is a main feature in the coat-of-arms of Nancy, the former capital of Lorraine.1
The first cross shown on the right is very small, measuring just 25 mm high and 17.5 mm wide. We don't know how old it is, beyond its discovery in an antique shop in 1969. It has the typical flowing curvilinear forms of Art Nouveau, for which Nancy is renown2. These are plant-inspired motifs which appear in the art of several ancient cultures; from the Persian and Indian 'Paisley' swirls, to the New Zealand Koru, to the Far Eastern Tomoe.
The age of this second cross is also unknown. After the First World War, an American soldier brought it from the area of Alsace-Lorraine, France, for his young sister in the United States.
An art collector has also sent us photographs of a ring in his possession, believed to have once belonged to Mary, Queen of Scots, which also shows the thistle with the Lorraine cross. This would date the thistle/cross combination to at least the 1500s.
The overall shape is that of a Lorraine Cross. A similar cross is seen in the flag of the area's separatist movement, the National Forum of Alsace-Lorraine3, the bilingual borderland between France and Germany. This flag also dates from the First World War.
Interestingly, on the second cross we can see a tiny version of the same style repeated on each of the six buds, and there's a seventh tiny cross on the left side of the thistle. (Click any image to enlarge.) Note that there is just one cross on the thistle, and not balanced with another, implying that seven seems to be a significant number for this item.
'Seven' is an extremely popular number, and in this case it is most likely in reference to the seven sacraments (rather than 7 virtues, 7 works of mercy, etc) because of the tiny cross on the left side of the thistle. Conventional thought is that a Roman soldier pierced the right side of Jesus when he was on the cross, so religious art usually shows the lance on the left side of the cross. From this wound flowed the blood, and it is supposed that is why the Eucharist cup is usually in the centre of artistic renditions of the seven sacraments.