They won the women's club double sculls in convincing fashion at Lake Ruataniwha after winning the senior double sculls a day earlier.
The Otago pair won by 2.48sec from a fast-finishing Invercargill combination of Toni Eade and Jessica Flett in 7min 39.30sec.
Brownstein (29), a PhD student in botany at the University of Otago, and Perrie (23), who works for the Accident Compensation Corporation, took the lead after 250m and had the race under control when they led by 1.5 lengths on the field at halfway.
This is their second year rowing together.
At the national championships at Lake Karapiro last year they finished fourth in the club double sculls and sixth in the senior women's event.
Perrie started rowing at Otago Girls High School.
This was her fourth gold medal at a national championships.
The Otago University women's club coxed four of Anna Price, Sarah Lindley, Fiona Bourke, Amy Grundy and cox Aynsley Moore finished strongly over the last 250m to snatch the silver medal.
Nelson won the race in 7min 34.78sec and Otago University finished 4.36sec behind in 7min 39.14sec.
The University crew was fourth at the 1000m but had moved up to third by 1500m.
It was the sixth New Zealand championship medal for Grundy (21), a chemistry student, who started rowing at Otago Girls High School.
Bourke (20), an accounting student from Hawkes Bay, won a gold medal in the novice event last year.
This was her second medal.
It was the first national medal for the other three rowers.
Lindley (19) and Moore (19) come from Arrowtown and Price (17) from Alexandra.
Lucy Strack (North End) won her first premier medal as a member of the Central RPC women's lightweight double sculls that finished third in a time of 7min 43.74sec.
Her partner was Kate French, of Waihopai.
Fiona Paterson (Central RPC), who started rowing at Columba College, won a gold medal in the women's premier pair with Rebecca Scown by 9.71sec, ahead of Auckland RPC, in 7min 32.52sec.
Former Alexandra rower Todd Petherick (Southern RPC) won a gold medal in the men's lightweight pair with Richard Beaumont in 7min 05.67sec.
Petherick also won a silver medal in the Southern RPC premier coxless four.
Former Otago rower Simone Hudson (Central RPC) won a gold medal in the women's premier eight.
Rowers registered with Otago clubs won 12 medals - six gold, two silver and four bronze - at the championships.
At Lake Karapiro last year Otago rowers won 10 medals: five gold, three silver and two bronze.
The North End club lightweight four of Syd Broadley, Neil Burrow, Allan Bridgman and Murray Farrant that won the gold medal at Lake Waihola in 1959 held a 50-year reunion dinner in Twizel on Saturday night.
