The Sunshine Girls' shooters and defenders proved unstoppable for the Ferns, however Jamaica's Head Coach Sasher-Gaye Henry said she believed they had not yet played to their full potential.
"We're pleased, but we have a lot of work to do," Henry said in a press conference on Thursday night.
"We were a little bit shaky in some of our areas but I think we were very strong in our shooting area and that made it good for us."
"We didn't stay mentally tough the whole game ... but we are happy with what we've done tonight, but we have a lot more to do in terms of the patience and the discipline."
Cullen, who was not initially expected to take part in the four-day series due to a knee injury has recovered well from rigorous fitness testing, and will be considered for the Ferns final two tests.
Folau will continue to be managed through the series campaign with a knee complaint, but was confirmed to be back on court tonight.
Both the return of Folau and Cullen will bring back much needed experience to the Ferns squad, and is sure to make an impact to how the Ferns play against Jamaica on Saturday at the North Shore Events Centre.
Silver Ferns goal shoot Grace Nweke speaks about the Constellation Cup series and the rivalry against the Diamonds in the final match. Video / Alyse Wright