You can have 750 anything. Just mix 750 parts of it with 250 of something else. It probably doesnt exist but still can be done
Probably that part of it is 18k gold, and part is sterling silver.
926It's 750. 925 is sterling silver. 375 is 9ct Gold
530,3 g potassium iodide are needed.
The number 925 may indicate a purity of the silver. The identifier 750 nf may be a design number, catalog number or other identifier best explained by the designer/ manufacturer.
Real silver can have many different markings, ranging from 750 to 999- depending on the piece, common marks are : 800, 900, 925, 950. Or on bullion (bars, coins.) 999.
Look more carefully ... it should be 750 and not 325. It means that your lace is 750/1000 (75%=18 carats) gold. The remain is other metals. It's a way to say how pure is the gold. Similarly, you will find 800 or 925 on silver stuff for 80% or 92,5% pure silver
750
There are several distinct sorts of hallmarks, including 750' gold. If a gold item contains the hallmark '750,' it has been tested and classified as 18 carat or 75% pure gold. The remaining 25% of the object is made up of various metals like nickel, copper, and, in certain circumstances, silver.
750 = 750/1
15% of 750= 15% * 750= 0.15 * 750= 112.5
750... 50 times 15 = 750 750 times 1 = 750
8.5% of 750 = 63.75= 8.5% * 750= 8.5%/100% * 750= 0.085 * 750= 63.75