Ms Byrne then wrote an 'open letter' to the acclaimed writer

A Sydney jewellery designer has claimed that renowned author Paulo Coelho took a quote she posted on Instagram in 2014 and used it as his own.

Mr Coelho, who is famous for writing the novel The Alchemist, allegedly posted Laura Byrne's quote to his social media pages on January 6 this year.

The Sydney designer runs the label TONIMAY and claimed that her musing was also posted by the writer on his account back in September 2014.

Jewellery designer, Laura Byrne, claims Paulo Coelho used an inspirational quote she wrote in 2014 (pictured)

Author Paulo Coelho is famous for writing novel The Alchemist. Laura Byrne claims he posted her quote to his social media pages (pictured) on January 6.

The Sydney designer (left) runs the label TONIMAY. Writer Paul Coelho is pictured right

The 29-year-old took to her Instagram and Facebook pages on Friday to post an 'open letter' to the novelist

The 29-year-old took to her Instagram and Facebook pages on Friday to post an 'open letter' to the novelist.

She claims that she is devastated by the 'missed opportunity' as she uses her creations and words to support her business - jewellery label TONIMAY.

Ms Byrne told Daily Mail Australia she initially felt 'mixed feelings of anger and flattery,' but they changed to devastation when - she alleged - her quote appeared again on the same account on Wednesday morning.

'Some brands use catalogues and models to give their brands content. I use my words - which give a beautiful authenticity and integrity to my business, and I feel that integrity was taken away.'

Daily Mail Australia has contacted Paulo Coelho for comment.

Mr Coelho (pictured) is an award-winning writer and has a large following on social media with his posts reaching thousands of people across the world

Friends and family of Ms Byrne hijacked his account posting several messages claiming plagiarism and linking back to the original 2014 post from the designer

Ms Byrne has been receiving messages of support from strangers and is thankful for the kind words

Mr Coelho is an award-winning writer and has a large following on social media with his posts reaching thousands of people across the world.