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.
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.
No, gas is typically invisible to the naked eye.
Mercury, Neptune, and Pluto are not visible to the naked eye due to their distance from Earth or brightness levels. Uranus can sometimes be visible to the naked eye under very dark skies, but it is challenging to see without a telescope.
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.
"S1" on gold jewelry typically refers to the quality of the diamonds used in the piece. It stands for "Slightly Included" and indicates that there are some small inclusions present in the diamonds, which may be visible under magnification but not necessarily to the naked eye.
The term "Naked eye" refers to your vision or able to be seen without the aide of a microscope or telescope.
Mercury, Venus, Mars, Jupiter, and Saturn can be seen with the naked eye.