Platinum jewelry is marked "Plat" or "950 Plat" and is nearly pure platinum. "IridPlat" is 90 percent platinum mixed with 10 percent other metals.
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It is the purity of the platinum. 850 is 85% pure. 900 is 90% pure. 950 is 95% pure.
Stamps on Gold and Platinum Rings The stamp 555 on a ring is 14k Gold The stamp 999 means Gold with Platinum The Stamp 333 on a ring is very Rare and Exclusive, it has different value's - stamped as ; 333 means Platinum. (rear white Gold) stamped as ; 333 , 350 means, Platinum above 10000 years old. stamped as ; 333 , 360 means, Platinum above 20000 years old.
The number stamped on the square tang indicates the bit size.
Most likely the pattern number
If gold is real it will be stamped with a fineness number of 1-999 or .1-.999. It can also be stamped with a karat number of 10K, 14K, 18K, 22K or 24K.