You probably don't -- can't discern the authenticity of a diamond with the naked eye.
Yes of course they can. Simulated Diamonds are made to Fool the naked Eye. A good Jeweler may spot one, But the average person on the street can not tell right off the bat. Especialy when it is set in Gold Already and polished up.
That depends, some gems are being made now to look almost completely like the real thing. However these are marked specifically because they are so hard to tell from natural diamonds. However, cheap diamonds that are crystal or glass will be obvious form the naked eye due to the clarity, and color.
Yes, some nebulae can be seen with the naked eye, if you know where to look. They are better seen with binoculars, but in the right conditions some can be seen with the naked eye, like the Orion nebula, in the constellation of Orion.
Neptune. Uranus can be seen with the naked eye, but it has to be perfect viewing conditions and you have to know where to look, otherwise it will look just like another star.
The term "naked eye" means that there is nothing helping the eye to see. for example, if you are using glassess or a telescpoe, then you are not using the naked eye.
I think you are asking if a natural clean diamond is worth as much as a natural diamond that is Not considered clean? The answer is no. A clean diamond means that it is clear from imperfections. Now this can mean clear to the naked eye, or clear under a microscope. Of course the diamond that is clear under the microscope is much worth more than a diamond that is only clear to the naked eye.
Neptune.Uranus can be seen with the naked eye, but it has to be near perfect conditions and you have to know exactly where to look as it will just look like a dim star.
No. But yes. Yeast is a microbe but it is visible with the naked eye
You can view the moon with the naked eye at any location in the world, you just need to know what the local moonrise and moonset times are.
When you look at your blood with the naked eye all you see is red liquid. This is all anyone sees with the naked eye.
Venus, Jupiter, Mars, Saturn, Mercury. Uranus is very faint but also naked eye visible on very dark nights, if you know just where to look, averted vision.
The term "Naked eye" refers to your vision or able to be seen without the aide of a microscope or telescope.