Meghan, who lived in Toronto while acting on the series "Suits" and is expecting the couple's first child in April, wore a green coat by Montreal-born designer Erdem Moralioglu and gold earrings from Maison Birks.
The stunning engagement ring, which was designed by her husband, features three diamonds - one a single solitaire from Botswana and two from his mother Diana's personal collection, set on a yellow gold band.
Harry designed Meghan's diamond ring himself.
While, we would never take the sparkler off, there may actually be a very practical reason why the duchess was spotted without it.
Britain's Kate, Duchess of Cambridge sits with members of the Royal family at the Commonwealth Service at Westminster Abbey.
Towards the end of the pregnancy the swelling can reach the hands, causing rings to become tighter around the fingers.
"She's [Cohen] not leaving because of any drama with Meghan", an insider shared at the time.
On Monday, they seemed to squash the gossip as Kate and pregnant Meghan appeared to smile and talk, and even shared a double cheek kiss!
The 2019 event is particularly significant as it marks the 70th anniversary of the modern Commonwealth.