Your answer may depend on the diamond. Some diamonds carry ID numbers etched in the girdle. In that case, you may be able to show provenance of a diamond if the records are kept in good order..
Carats describe the weight of a stone. A jeweler can show you the scale used for this purpose.
Diamonds are weighed in carats, using a digital scale that has been certified. Unless you are a jeweler, it's best not to remove the stone for weighing it. Depending on the cut, a local jeweler may be able to measure it and give you a fair idea of its weight.
Should is an interesting word, and in this context doesn't mean much, until you expand the context of the query. If the jeweler is proving that the diamond is not on the list of stolen diamonds -- those listed with serial numbers, then, yes: the jeweler should show you the serial number on a diamond. If the jeweler wants to prove that a serial number exists on a diamond -- it cannot be seen with the naked eye -- then, yes: the jeweler should show you the serial number on a diamond. Otherwise, the situation requires a context.
Here's your math problem: today on Blue Nile you can purchase half carat diamonds of this clarity and pay between US$579 and US$1582, depending on the cut and colour of the diamonds you want to buy. With 20 such diamonds, you can figure out the range of values, above, or take your cache to a jeweler so that each diamond can be valued individually, which is the practice for vendors in this marketplace.
The value depends on the carat weight of the individual stones, their clarity, colour and cut. Your local jeweler may be able to show you comparable stones and tell you how much s/he would charge you for that inventory.
Take the stones to a jeweler, and the jeweler can tell you whether or not the stones are diamonds.
You take your ring to a local jeweler and ask that the jeweler test the diamonds with a probe to confirm that they are, or are not, diamonds.
A local jeweler can answer your question when you show the jeweler the ring.
The possessive form for the plural noun diamonds is diamonds'.Example: I had the diamonds' settings checked by a jeweler.
Apparently, you are interested in whether or not the stones are real diamonds. Your best option is to take the jewelery to a local jeweler and ask the jeweler to use a probe to confirm that the stones are either diamonds or not diamonds.
You can purchase them from the laboratory, or from a jeweler who sells man-made diamonds.
Most any jeweler will be able to show you asher-cut diamonds.
Have diamonds checked by a jeweler. It takes an expert to be sure
Jewelers purchase faceted and polished diamonds from diamond brokers, depending on the quality of diamonds the jeweler wants for the jewelery it manufactures.
Take your earrings to a local jeweler who can use a probe to confirm that the diamonds are real -- or not.
It depends on the jeweler, but generally, yes.
The field test for diamond is 'extreme hardness'. If you find rocks that you suspect to be diamonds, you can perform the field test, above. Otherwise, you can take the stones to a local jeweler and ask the jeweler to use a diamond probe to verify that the stones are -- or are not -- diamonds.