It is most likely the maker's initials.
NB or N&B could stand forNeustadt & Barnett, who were ring-makers from Birmingham in the UK in 1839.
If there is an SN somewherearoundthe NB, it was made byN B & Sn in 1941, London, UK.
It could also be theNayler Brothers (1926-1988).
Or maybe Needham Brothers (1901-1917).
The best way to get a proper definition of the NB is to ask aprofessionaljeweller.
The stamp "NB" on the inside of a ring typically stands for "Nordic Bronze," indicating that the ring is made from a specific type of alloy that includes copper and other metals, known for its durability and resistance to corrosion. It may also refer to the initials of a designer or manufacturer. If you're unsure of the specific meaning, it can be helpful to consult with a jeweler for clarification.
Nb is the chemical symbol of niobium.
The marking "nb-14k" on a ring typically indicates that the piece is made of 14-karat gold, with "nb" possibly representing the manufacturer's initials or a specific design code. The "14k" signifies that the gold content is 58.3% pure gold, with the remaining alloy made up of other metals for durability and color. This marking helps identify the quality and authenticity of the gold used in the jewelry.
NB stands for Nominal Bore.
Nickel Back
Niobium
I am not quite sure what you mean by "nb", but I don't think it's a unit of length.
I suspect that NB stands for the Latin phrase nota bene,whick means 'note well'.
nb nb kj:)
NOTA bENE
925 on a ring mean
'14k' means that the ring is 14 karat gold. It is alloyed with another metal to harden its wearability. NB 24k is pure gold 22k may be found in gold objects 18k gold jewellery e.g. dress rings. 'r' is probably the makers reference.