Kate Middleton's sparkling sapphire engagement ring is inspiring legions of wannabe American princesses, the New York Post reported Friday.

Knockoffs of the royal bauble, which originally belonged to Princess Diana, will be the accessory of choice this holiday season, New York City jewelers said.

Prince William proposed to Middleton on a vacation in Kenya in October and later explained that he used his late mother's ring so that she "didn't miss out on the excitement."

By Thursday afternoon, the Natural Sapphire Co. in Midtown had received 51 orders -- and "too many emails to even process" -- requesting the ring, according to CIO Evan Guttman.

"We get orders for the Diana replica every once in a while, but after the engagement, the demand is just tremendous," Guttman said.

Most customers wanted the $1,000 replica.

Meanwhile, the royal-blue dress Middleton wore to announce her engagement Tuesday is also in high demand.

The $600 Issa design sold out across London within a day of the announcement, boutique owners there said.

Customers showed up at New York stores that carry dresses by Brazilian designer Daniella Issa Helayel, only to find it was not available.

Read more: http://www.nypost.com/p/news/international/copykates_shop_for_ringers_zXIuodiwFJQiOxc57ECsBM