Image: A Gucci store in Hong Kong © Bobby Yip, Reuters

While all eyes have been focused on luxury-goods growth in China, another market has quietly been bolstering the business of high-end goods purveyors: the U.S.

French silk-scarf maker Hermès International (HESAF) said last week that fourth-quarter sales rose 21% in the Americas to $247.5 million. That comes on top of a slew of strong U.S. performances for its peers, such as LVMH Moët Hennessy Louis Vuitton (LVMUY) and Cartier owner Compagnie Financière Richemont (CFRUY). Gucci parent PPRSA(PPRUF) confirmed the pattern when it reported Friday that earnings in 2012 increased 19%, and sales grew by 21%.

Even after such robust growth, Hermès still has "an enormous growth potential" in the U.S., says Chief Executive Patrick Thomas. "It's still a market to be conquered."

The U.S. has been showing signs of strength. The economy has bounced back from recession, unemployment has declined, the stock market is tickling record highs and home-sale prices have improved. As a result, wealthy Americans are spending freely on expensive clothing, accessories, jewelry and beauty products.

"Dynamism in the luxury sector is very linked to economic growth," says Frédéric Rozé, the head of the U.S. for French cosmetics company L'Oréal SA (LRLCF). "The U.S. is a major source of growth for L'Oréal."

Even though consumer-confidence levels are wobbly, analysts say the biggest spenders are shrugging off any uncertainty. Demographic changes and tourism trends in the U.S. bode well.

"Trends in luxury consumption in the U.S. have continued to outperform overall consumer trends," says HSBC luxury-goods analyst Antoine Belge.

Since the 2008 economic crisis damped luxury-goods sales in the U.S., China has been seen as the sector's primary driver globally. Chinese consumers took on additional importance as the eurozone crisis bit into spending among local European consumers. Many luxury executives saw busloads of Asian tourists in Europe as coming to their rescue.

But last year, cooling Chinese growth led to fears that luxury goods' long, good run was ending. The double-digit sales increases became harder to attain for companies such as LVMH Moët Hennessy Louis Vuitton, which had operated in China for more than 20 years.

As a result, the U.S. has taken the lead in sales growth.

Most luxury-goods players planted their flags in the U.S. long before they ventured into China. Last month, luxury bellwether LVMH, the world's biggest luxury-goods company and parent of brands such as Louis Vuitton, Moët et Chandon champagne and the Sephora cosmetics chain, said the U.S. was its strongest region in 2012. Excluding currency effects and acquisitions, sales rose 12%, outstripping 10% growth in Asia excluding Japan.

Demographic trends play in favor of the luxury-goods industry. Hispanic-Americans and Asian-Americans are bigger consumers of luxury-goods fashion and cosmetics than the average American, executives say. At L'Oréal, for instance, Asian-Americans spend heavily on skin-care products. L'Oréal makes high-end perfumes and cosmetics under labels such as Lancôme and Giorgio Armani, but also has many mass-market brands.