Like how do they know if something's silver, platinum, or white gold?
2006-12-24 08:45:43 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
One way is to measure the density. This is done by weighing in air, and in water. The difference is used to calculate density.
Also, there are certain chemicals that react with certain metals in a particular way. This is not done normally, since it is destructive.
2006-12-24 08:58:06 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The vast amount of costume jewelry is worthless. However if the metal is real gold and the stones are real, a jeweler can appraise it. Some costume jewelry is collectable if it is made of bakelite. Check your public library for a book on collectables or see if there is a name on the jewelry that you can look up online.
2016-05-23 04:28:39 · answer #2 · answered by Anonymous · 0⤊ 0⤋
They use a touch stone to rub it on.
2006-12-24 11:13:58 · answer #3 · answered by Anonymous · 0⤊ 0⤋
They are trained in all this!
2006-12-24 08:50:59 · answer #4 · answered by SuzyBelle04 6 · 0⤊ 1⤋