9 carat gold is only 33% Gold and 66% copper. Pure Silver is soft... To answer the question - the 9 carat Gold is harder than the Silver.
24 is the highest carat of gold, which is about 99.999% pure.
12 carat gold has 50 % gold and 50 % copper or silver, tin.
10 grams of silver is around £8.77 depending on the carat or the silver
925 is a mark for Sterling Silver
30%
Generally, 10 to 13 carat diamonds are the highest used in watches.
15 carat gold is an alloy containing 62,5 % gold and the rest is copper, tin, silver.
Pure gold is quite soft and you can leave teeth marks in it if you bite it. This method was often used in the past to test gold coins. Silver is added to gold to make it harder and the more silver which is added then lower the carat that the gold is assigned. In Britain 24 carat gold is pure, 22 carat is very high grade, 18 carat has much more silver and less gold and 9 carat has the least amount of gold.
If the bracelet is 15g gold and 5g silver, then the gold content is 15/20 or 75%. Pure gold is 24 carat, so 75% is 18 carat.
24 karat gold is pure gold.
"Lady of the Century" coins were minted by a large variety of countries, in a number of different years. The have been variously minted in 24 carat and 22 carat gold, pure silver, sterling silver and 50% silver.