What was stolen in the Louvre heist? What to know about the 8 jewelry pieces — and the ‘race against time’ to save them.

As of Monday, the Louvre Museum in Paris was still closed following the brazen daylight heist that took place on Sunday and resulted in eight missing pieces of Napoleonic jewelry.

In a swift robbery, which officials believe took place within seven minutes, thieves disguised as museum workers rode a truck-mounted basket lift up the famed museum’s exterior and forcibly entered through a window, just 30 minutes after the Louvre had opened for the day. After smashing display cases in the Galerie d’Apollon, the masked robbers fled the scene on motorbikes. Eight “objects of inestimable heritage value” were stolen, per France’s Ministry of Culture, and one item, an ornate gold crown, was recovered near the scene.

“Thanks to the professionalism and swift action of the Louvre’s agents, the criminals were put to flight, leaving behind their equipment and one of the stolen objects, namely the crown of Empress Eugénie, the condition of which is currently under review,” read a statement from the Ministry of Culture.

Art detective Arthur Brand said on Monday that police have only one week to find the missing jewels before they’re potentially gone forever. Because of how famous the jewels are, Brand told Sky News, the “only thing” the thieves can do is “melt the silver and gold down, dismantle the diamonds” and “try to cut them.” If this is done, he added, the jewelry “will probably disappear forever.”

“They [the police] have a week,” Brand told the outlet. “If they catch the thieves, the stuff might still be there. If it takes longer, the loot is probably gone and dismantled. It’s a race against time.”

Below, Yahoo breaks down what was stolen.

Diamond and pearl tiara and diamond brooch

Consisting of diamonds, oriental pearls and silver, Empress Eugénie’s tiara is considered one of the Louvre’s most prized pieces. The tiara, made by jeweler Alexandre-Gabriel Lemonnier in 1882, per the Louvre, is composed of 212 pearls and 1,999 diamonds and 992 rose-cut stones.

Empress Eugénie’s large bodice bow was also stolen in the heist. The item, which is made of diamonds, silver and gold, features tassels and articulated fringes. It was designed by jeweler François Kramer.

Composed of 2,438 diamonds and 196 rose-cut stones, the brooch also originally formed the buckle of a diamond belt of more than 4,000 stones, which was exhibited at the Universal Exhibition of 1855 before being worn by Empress Eugénie, according to the Louvre.

Eugénie, per CNN, reportedly wore the belt during a visit by Queen Victoria to the Palace of Versailles in 1855, and once more for the baptism of the Prince Imperial in 1856, before eventually transforming the item into a brooch.

Sapphire jewelry set

A sapphire and diamond set, consisting of a tiara, necklace and single earring that was worn successively by Queen Hortense, Queen Marie-Amélie and Isabelle of Orléans. According to the Louvre, the articulated necklace is adorned with eight sapphires of varying sizes and 631 diamonds. The tiara and single earring are composed of Ceylon sapphires in their natural state.

While its origins and designer remains unknown, the Louvre considers the set “a precious testament to Parisian jewelry.”

Emerald necklace and earrings

Napoleon delivered this set to Marie-Louise of Austria, his second wife, in 1810, with the intention of adding it to her personal jewelry case, according to the Louvre. Crafted by jeweler François-Régnault Nitot, the necklace is composed of 32 emeralds and 1,138 diamonds. The necklace and the pair of earrings, which were preserved in their original state, joined the Louvre’s collection in 2004.

‘Reliquary’ brooch

Created in 1855 by jeweler Paul-Alfred Bapst for Empress Eugénie, the diamond and gold brooch, known as the “reliquary brooch,” consists of seven diamonds surrounding a rosette, followed by two large diamonds that lay opposite each other, and additional diamonds that suspend from them. According to the museum, a total of 94 diamonds were used to craft this piece. On the back of the brooch are engravings of leaves and foliage.