Neither South Australia nor Victoria were penal colonies so Sarah would not have been a convict if she emigrated to either.
I was going to suggest you search for information on TROVE but someone has tagged many items about Edward. He was declared insolvent in South Australia. Perhaps that is the reason he moved to Bendigo. I haven't read them all so you may like to have a browse. The Bendigo Bank was founded with one other and purchased by the Bank of Victoria.
http://trove.nla.gov.au/list?id=11960and
http://www.rootschat.com/links/0s71/A brief bio...
http://www.parliament.vic.gov.au/re-member/bioregfull.cfm?mid=355EMMETT Edward Nucella arrived in SA 1841-04-02 aboard
FOX from Launceston Source 6,7
EMMETT (Edward Nucella?) arrived in SA 1841-12-06 aboard
HAWK from Launceston - Source 6,7
EMMETT Edward Nucella arrived in SA 1846-02-18 aboard
UNION (2) from Launceston Source 4,6,7[First arrival 1841
FOX] and 38.
4 South Australian Birth Registration Certificates Index 1842-1928, Genealogy SA, 2012
6 Newspapers - shipping intelligence, imports, obituaries, etc
7 Biographical Index of South Australians 1836-1885, SAGHS, 1986
38 Index to Departures 1817-67, Archives Office of Tasmania
Departures from Tasmania
EMMETT Mr Edward Passenger
LADY EMMA 23 May 1841 George Town to South Australia CSO95/1/1 p82
EMMETT Edward
UNION 1 Feb 1846 Launceston to Adelaide CSO20/23 p3
From
Biographical Index of South Australians. Not always 100% accurate. I would suggest that much of this entry has been submitted. There is an error with his place of death.
EMMETT Edward Nucella
Parent Henry James Born 18 Feb 1817 LND ENG died 18 Mar 1874 Bendigo Vic
Arrived 1839
FOX Departed Victoria
Occupation Merchant, Auctioneer, Goldminer Lived Adelaide.
Married 22 Mar 1849 Adelaide SA Sarah Forsyth nee BLACKHAM Parents Richard and Sarah Died 5 Sep 1902
Children Bertha Beatrice, Edward Blackham 1850-1850, Richard Spotiswood Wm 1852-1852, John, Robert, Sarah Spotiswood Grace 1855-1861, Lily Bannerman Blanche 1865-1866, Harriet HALTERMAN, Mary BEYERS
There is only one birth registered to Sarah
DOLBY on my resource.
EMETT Mary Dolby
26 Oct 1847
Father Edward EMETT Mother Sarah DOLBY
Birth Place not recorded Ade 2/24
Unfortunately SAGenealogy databases are indexes only.
These deaths appear to be children from his marriage with Sarah
BLACKHAMEMMETT Edward Blackham
21 Nov 1850 7 months Status Child Relative Edward Nucella EMMETT [Father]
Residence Adelaide Death Place not recorded Ade 2/43
EMMETT Sarah S
24 Sep 1861 6 years Status Child Father Nucella EMMETT [Father]
Residence Melbourne [VIC] Death Place Kent Town Ade 9/293
From the book of
The Register Personal Notices
24 Mar 1849
On Thusday the 22nd instant, by Special Licence, at St John's Church, Adelaide by the Rev. W J Woodcock, E N Emmett Esq., to Sarah, daughter of Mr Richard Blackham
25 November, 1850
At Bent-street, on the 21st instant, Edward Blackham, son of Mr Edward N Emmett, aged seven months.
9 Dec 1851
On the 5th instant, at Bent-street, Grenfell-street, Mrs E N Emmett, of a son, stillborn.
5 Oct 1861
EMMETT - On the 23rd September, at the residence of W J Blackham, Esq., Kent Town, near Adelaide, of exhaustion after measles and ulcerated throat, Sarah Spottiswoode Grace, aged six years, the beloved and only child of E N Emmett, Esq., Melbourne.
I would agree with you that Sarah
DOLBY and Edward N
EMMETT were never married as I doubt he would be advertising his marriage in the newspaper along with the births and deaths of his children with Sarah
BLACKHAM. Have you considered that perhaps
DOLBY was not Sarah's maiden name. Perhaps she was already married when she met Edward.
From BISA -
BLACKHAM Richard born c1788 Died 16 Feb 1864 Adelaide SA buried WTC
Arrived 1840 on the
BIRMAN0ccupation Bookbinder Lived Adelaide
Married 16 Apr 1816 Sarah nee SPOTTSWOOD born c1789 and died 25 Feb 1868 Adelaide.
Children Henry Hamilton1818-1900, Richard c1820-1900, Frederick Keane1823-1892, Albert c1827-1874, William George c1828-1910, Sarah Forsyth EMMETT 1830-.
Sorry if this post appears a bit jumbled...posted as I found the info and it is late for me...past my bedtime.
Cheers
Cando