Brand comparisons usually run on opinion. This one runs on settled transactions: 400 recorded sales of Piaget and 201 of Blancpain, all in US dollars so the figures are directly comparable.
What each one actually costs
The median Piaget result is $5,250. The median Blancpain result is $7,810. On typical examples, Blancpain carries roughly 1.5 times the price of Piaget at auction.
Half of all Piaget sales land between $3,570 and $10,240. For Blancpain the middle half runs $4,375 to $16,250.
Which one surprises the specialists
41% of Piaget lots beat their high estimate, against 44% for Blancpain. The two are closely matched, which suggests both are priced with similar confidence.
Breadth of the record
Our archive covers 156 distinct Piaget references and 75 for Blancpain, with results going back to 2001 and 2004 respectively. The top recorded result is $602,500 for Piaget and $109,000 for Blancpain.
What this does not tell you
A median is not a verdict. These brands overlap heavily at the edges, and a well chosen example of the cheaper one will outrun a poor example of the dearer one. Condition, completeness and model matter more than the badge on the dial.