'Good' is a judgement and you are the judge.
A 'good' diamond could be a perfect, flawless, diamond, as in a 'good' investment. Or a 'good' diamond could be a family heirloom, worn by several generations of fabulous women.
With every diamond comes a certificate
In the field, you can identify a raw stone because of its clarity and its extreme hardness.
A green diamond is a diamond in possession of a shade of green. A gemologist can help you identify the source of its colour -- whether natural or treated.
Yes, a 10 carat diamond is 'good'.
No, a diamond marking pencil is typically used to mark or draw on materials. To identify a diamond, gemologists use tools like loupes, microscopes, and other testing equipment to examine the stone's characteristics like color, cut, clarity, and carat weight.
A good site to identify seashells is seashells.org or seashells.com
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The field test for diamond is extreme hardness. Other tests include the use of a probe, which jewelers use to identify diamonds.
Yes: not a good use for a diamond, but yes, a diamond will scratch a nail.
The best way to identify or get a grading on a diamond if you don't have the certificate is to take it to a local jeweler. They will be able to either give you an evaluation or put you in contact with someone that could.
To identify a real diamond, you can perform a few tests. Look for imperfections or inclusions within the stone with a magnifying glass, real diamonds often have tiny imperfections. Conduct a fog test by breathing on the diamond - if it stays fogged for a few seconds, it may be real. Additionally, a professional jeweler can perform tests like using a diamond tester to confirm its authenticity.
Trained gemologists use a 10x magnification to identify diamond clarity. You can read more about how clarity is graded by understanding the flaws and how they occur, below.