Kate Middleton rewore a $375 shamrock necklace made with recycled gold for St. Patrick's Day

• Kate Middleton wore a sustainable $375 shamrock necklace by Daniella Draper to mark St. Patrick's Day.
• The necklace was made with 100% recycled gold.

The Duchess of Cambridge paid tribute to Ireland with a $375 (£270) gold shamrock necklace.

Kate Middleton and Prince William marked St. Patrick's Day alongside other world leaders in a video where they recalled their visit to Ireland last year, when the duchess was last photographed wearing the necklace.

"The warm welcome that we received everywhere was a testament to the friendship between our two countries, and the strength of the relationship between the UK and Ireland," Middleton said in the video.

Middleton's necklace is by British jewelry brand Daniella Draper, Hello! Magazine and People report.

The product description on Daniella Draper's website describes the significance of the shamrock.

"Originally used by St. Patrick to depict the Holy Trinity, the three leaves of the shamrock were known to represent the Father, Son & Holy Spirit," the description reads. "However, in more recent times, the three leaves have been commonly known to stand for faith, hope & love. Per Irish tradition, a fourth leaf is considered the symbol of luck."

It wouldn't be the first time Middleton has used style to pay tribute to the country. Middleton has consistently worn green - Ireland's national color - and shamrock brooches and earrings during visits to the country and during previous St. Patrick's Day celebrations.

The duchess may have chosen to wear Daniella Draper due to the brand's sustainability. The necklace was made using 100% recycled gold.

The brand's mission statement is to "preserve and protect" the natural world, according to its website.

"Being open about this commitment to sustainability is celebrated in the everyday efforts many of us already take to do our bit. Transparency on this journey is everything," the statement reads.