Hartmanns sure have some examples on their website which look close to what Crown Princess Mary is wearing (hoping that posting pictures will work!)
"Stor brillantring i platin prydet med 8,00 ct. rund brillant omkranset af 280 brillanter, i alt 2,14 ct. Top Wesselton/VS brillanter. Pris på forespørgsel"
--Previous Message-- : I think it looks like a sponsor gift... HRH : wears a lot of sponsored gifts (Danish : brands like Georg Jensen, Marianne Dulong, : Ole Lynggaard, Shamballa etc) - this one : looks like it is from Hartmanns : (hartmanns.com) :