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A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 925, exactly as in the question.
0.925 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 925/1000 which can be simplified, if required.
The factors of 925 are:1, 5, 25, 37, 185, 925.
It is unlikely that a bracelet would weigh 925 gm (grams), about two pounds. A close look at the bracelet should reveal that the 925 is preceeded by a decimal point---".925"---that is stamped on the piece of jewelry (ring, earring, bracelet, etc.) to denote that it is comprised of 92.5% silver. The remaining 7.5% is a hardening agent, often tin or copper. The fact that the bracelet in question appears to have "gm" following the number could be coincidental in that it could be the initials of the manufacturer or jeweler.
% change= |815 - 925|/815 * 100%= 110/815 * 100%= 0.13496 * 100%= 13.5% (% increase)