Meghan Markle's £6.50 jam was made in a factory in a separate part of the US, although the company is based in California. The 43-year-old previously shared a clip to Instagram showing the jam bubbling away in a pot, with her four-year-old daughter Lilibet's voice heard in the background saying, "beautiful".

It has since been revealed that the sweet treat is manufactured by the same US giant which sells her £9 packs of herbal tea. As well as the tea, the factory also made her sold-out orange blossom honey, which was priced at £20 [$28] a jar.

The company, named The Republic of Tea, is located in Larkspur, which is 350 miles away from Meghan and Prince Harry's Montecito mansion. Despite the firm being in California, the factory is located in Illinois, which is more than 2,000 miles away from Montecito.

It emerged last week that The Republic of Tea is already selling a range of teas on its website featuring the branding of ITV's Downton Abbey and Netflix's Bridgerton.

The firm is believed to be the original supplier of Meghan's £11 [$15] flower sprinkles, with the products, as well as the tea, selling at triple the price by As Ever, reports The Mail.

As reported by The Sun, royal expert Margaret Holder also branded the former working royal a "Meghan Mark-up" for selling the products at three times the price that The Republic of Tea are selling for.

She told the publication: "Customers are paying a considerable increase for Meghan's label. She is taking advantage of celebrity branding. But it's a case of Meghan Mark-up not Meghan Markle."

The Mail states that, as of June 24, As Ever's website also read 'Brand: "republic-of-tea"' - which was later changed to 'As Ever store'. It also reported that it is unclear whether Meghan bought her tea directly from Republic of Tea and had it packaged separately, or whether the company did the product, packaging and branding.

As Ever also mentions, the company is in the FAQ section on the website.

The answer reads: "We partner with best-in-class vendors to bring our product ideas to life—translating our founder's recipes and bespoke concepts into beautiful, scalable goods."