No such thing as 975 for gold.
Nearest matches for that number would be:
925 = Sterling silver
875 = 21ct/k gold (very rare, usually Arab countries do 21ct).
You could have misread it, hallmarks are very small so its an easy mistake to make.
The 950 marking could mean Platinum or Palladium, the 950 means 950 parts per 1000 parts is platinum or palladium
It depends on what context you mean. There is a jewellery company called 'Hallmark' - However... Hallmark jewellery usually refers to jewellery that conforms to international standard of purity. For example, 18 & 24 carat Gold, or 975 purity Silver.
975
325 hallmark is not a standard hallmark and it is not 9 karat. It might be that it is 32.5% gold inside. 9 karat gold has a hallmark of fineness 375. 8 karat gold has a hallmark of fineness 333.
There is no such thing as a 975 hallmark for gold. It could be 975 if the metal is actually silver. This means that the metal is 97.5% sterling silver, while the rest is is most likely copper (because silver on its own is very flimsy, like foil). Maybe the copper has reacted with the air over the years and turn the metal a browny-goldish colour, leading you to mistake it for gold? Applying a silver polish will clean it up. If it is indeed 97.5% silver then your metal product is very rare and therefore very expensive. It is also possible that the number "9" you are seeing is in fact the number 8. Wear and friction over the years eventually rubs the numbers down and makes them hard to read. If this is the case then the number is actually 875, which means the metal is 87.5% gold (21 carat).
how can i convert my kdm gold jewellary to hallmark jewellary
Yes can be white Gold hallmark in gold metal alloys Ring.
hallmark rate
220 is not a gold hallmark. The lowest number that is used as a gold hallmark is 333 (meaning 33.3% gold content, which is 8 carat, the lowest gold carat). 220 is actually the hallmark for bronze, which is a copper alloy called "Alloy 220" (or sometimes sold as "commercial bronze"), not gold.
916 today's hallmark gold rate in kolkata
what is 275 gold hallmark
975 denotes the purity of the metal used. 975 parts per thousand. The rest, 25 parts per 1000 are alloys.
Yes