Sarah Ferguson has revealed her 'delight' over her latest business venture as she unveiled £1,742 fountain pens engraved with her royal monogram.

Sarah, who is often known as 'Fergie', 60, said it was 'a delight' to work with Montegrappa Italia to design three pens 'inspired by the colours of nature' as she unveiled the news on Instagram.

She revealed: 'I use one to write my children’s books. I’m old-fashioned and almost always work in longhand. Although I sometimes revert to tech when I feel like it...'

Each pen comes with the Duchess of York's personal monogram engraved on the 18K gold nib as well as a 'foil-embossed' carry case bearing some of the royal's favourite quotes.

Sarah 'Fergie' Ferguson, 60, has announced her latest business venture on Instagram as she revealed she has designed three fountain pens, which each costing a whopping £1,742 (pictured, the royal with the pens)

The Duchess of York revealed the collaboration on Instagram, and said she was 'delighted' with the partnership

Announcing the partnership on Instagram earlier today, Fergie shared a link to the Montegrappa Italia site.

The pens, which Fergie designed having drawn inspiration from nature, come in three different colours and are described online as 'evoking the natural kingdoms of Ocean, Forest and Garden'.

The website describes how 'writer and humanitarian' Fergie is 'reflecting on nature’s wonders in a rare collaboration.'

Each case contains twelve concertinaed pockets carrying postcard images and quotes collected by Sarah on her travels.

Each pen comes with a case embossed with Fergie's royal monogram and carrying postcard images collected by Sarah on her travels

The brand suggests 'enjoying them in moments of quiet contemplation, or pen some thoughts to a friend.'

The collaboration comes weeks after the Duchess announced she had signed a seven book deal to write children's stories.

The royal's seven books will consist of five picture books and a two young chapter books, with the first on sale mid 2020.

The royal is already the author of more than 25 books, including the Budgie the Little Helicopter and the Little Red series.

The pens are described as 'evoking the natural kingdoms of ocean, forest and garden' cost £1,742 each

Fergie's latest business venture comes weeks after she released her products including towels, soaps and tea cups based on photographs she had taken.

Labelled The Duchess Collection, the products will come in orange packaging with a logo featuring two rearing winged horses that is rather reminiscent of the livery of uber-brand Hermes.

It hopes to combine ‘glamour’ with ‘compassion’ and includes a collection of towels, soaps and teas.

The tagline for her brand is: 'Entertainment, Edutainment and Lifestyle.'

Fergie said she had used the pens to write her latest children's books, announcing she likes to write 'long-hand'

It comes weeks after the royal released a new range of products including royal tea cups based on photographs which she has taken

The Duchess has already pitched the idea to a select number of super-rich potential investors with dreams of raising £10 million to fund it.

There is also a range of ready-meals, called 'Fergie's Farm', which it is hoped will be launched later this year.

It is yet to be seen whether the Duchess, who has endured a chequered business history since her divorce from Prince Andrew in 1996 — at one point reportedly finding herself with debts of £5 million — will make a success of the venture.