Take a tour of Cartier's glittery, jewel-filled mansion, which was just transformed to have more than 5 times the space

Cartier's New York beauty is shining once again.

The French brand's flagship boutique in New York City reopened in September after two and a half years of extensive renovations.

The building, which dates back to 1905, was originally a six-story mansion home to the Plant family, and is situated on 52nd Street and 5th Avenue. As the area became the commercial corridor we know it as today, the Plants moved uptown and sold the house to Cartier in 1917.

Cartier refurbished the entire building with the help of renowned architect Thierry Despont. Wood paneling was refurbished, new chandeliers modeled after the originals were installed, and the 5th Avenue entrance was moved to the center of the building for symmetry purposes. The total square footage was expanded dramatically, going from 8,600 square feet to a whopping 44,100 square feet.

Cartier gave us a chance to see inside the mansion and take an up-close look at the precious items on display, some of which are worth millions and millions of dollars.