Lady Marianne Isobel Moncrieff

Isobel Moncrieff (1875 – 28 September 1961) was an artistic designer of Monart Art Glassware in Perth, Scotland between 1924-1934. Due to the era she was never officially made a director. While the Ysart family had the technical know-how to create the glassware within the Monart Glassworks, it was Moncrieff's designs which were the basis for their world-renowned coloured glass pieces. Queen Mary was an admirer of the glassware and 33 glassware pieces were designed and commissioned by her to be presented as Perth's gift to Queen Elizabeth and Prince Philip on their wedding.

She had one sister and five brothers. Her father Matthew Dunlop was a flour and grain importer. Her mother Margaret Waters Ure had a brother, John Ure, L.L.D., who was the Lord Provost of Glasgow (1880–1883), deputy lieutenant of Lanarkshire (1882), Deacon of the Incorporate of Bakers (1854 & 1857), Dean of Guild, an ancient city office (1890–91). He declined a knighthood for personal reasons.

The pieces produced by Monart were supplied to Watson's of Perth, on Perth High Street, on a sale or return basis. These pieces can be found in the audits of Balmoral Castle with only 32 pieces left.

After Moncrieff left the Monart Works, the Ysart family continued to produce glassware but in her opinion the colours became garish, and lost some of their refinement. Returning early from honeymoon due to her father's failing health, she and her husband set up home in Perth and took part in the social and civic life.

Moncrieff mixed with the likes of the Duchess of Atholl. The portrait depicts a lady in her later years, with a very kind face and wonderful blue eyes. She is wearing a sea-green dress with a fur coat over it and has on a pearl necklace and pearl drop earrings.

Moncrieff had miscarriages and she and her husband had no living children to inherit their estate, which was therefore left to their nephews.

In 2022, a series of wire statues of notable Perth women, including Moncreiff, was created in Perth by the Raise the Roof project. The Wire Women were part of Perth and Kinross 'Year of Stories' with community groups, creatives and cultural organisations sharing the stories of women.

Moncreiff was No 13 of 20 wire sculptures which were set out in a trail around Perth City Centre and was situated outside 2 High Street, Perth.