No identifiable birth record found on FindMypast and certainly none post 1910 with a Stone mother.

This is the only record on FindMyPast of a marriage between any Whitby and any Jeram:

First name(s) NIGEL M
Last name JERRAM
Marriage quarter 4
Marriage year 1937
Registration month -
MarriageFinder™ NIGEL M JERRAM married
MARY E WHITBY
Spouse's last name WHITBY
District SURREY MID EASTERN
District number -
County Surrey
Country England
Volume 2A
Page 345
Record set England & Wales marriages 1837-2008

But I cannot identify any birth of a mary E that might have got married in Surrey.
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