The couple are also friends with Ms Balquier, who is married to s friend Nacho Figueras - with the four together at a charity polo match last Friday.
This is the latest launch amid a trend of celebrities shifting their own food products - with among those selling honey from their own gardens through the Flamingo Estate brand for up to $250 (£200) per jar.
Meghan could have found inspiration from her father-in-law who began selling products such as jam from the Duchy of Cornwall estate in the 1990s.
took on the Duchy estate after death in 2022, and Duchy organic strawberry jam is on sale at for £2.80 per jar - with sales from the full range helping raise £30million for the Prince of Wales's Charitable Fund.
Mrs Robbins posted a picture of Meghan's jam, which had the American Riviera Orchard logo and 'Montecito' underneath - the celebrity enclave in where Harry and Meghan live in a £12million home. The label also had the words '17 of 50'.
The photo on Mrs Robbins's Instagram Stories showed the jam in her hand, and she said: '@AmericanRivieraOrchard Breakfast, lunch and dinner just got a little sweeter.'
Showing it in a basket with lemons, Mrs Robbins added: 'Thank you for the delicious basket! I absolutely love this jam so not sure I'm sharing with anyone. @American RivieraOrchard Thank you, M! #MontecitoGoodness #AmericanRivieraOrchard.'
Fashion designer Tracy Robbins posted a picture of the jam, which had the logo for American Riviera Orchard and 'Montecito' underneath. The label also had the words '17 of 50'
Showing the strawberry jam in a basket with lemons, Tracy Robbins added: 'Thank you, M!'
Delfina Balquier also posted a photo on Instagram and said: 'Strawberry jam makes me happy'
