No, they are definitely are not the same thing. A lab grown diamond is considered as a real
diamond and has the same physical, chemical, and optical properties as that of natural
diamonds.
Cubic Zirconia, on the other hand, only looks like a diamond but doesn’t possess the same
chemical composition, and is termed as a fake diamond. Cubic Zirconia is a lab created
material which is hard, colourless and doesn’t have any flaws or inclusions in it. Due to the
absence of any sort of inclusions, this man made material has immense clarity and brilliance.
It is much cheaper than a natural diamond or a man made diamond.

Yes, these two terms mean the same thing. Whether you call it a synthetic diamond or lab grown diamonds, they both will mean, a diamond which is created in a lab under a controlled environment by humans.

Yes, they can confirm it. Given they know where to look and what to look at. Firstly, lab grown diamonds come with a certificate, if a jeweller can prove that the certificate provided is authentic then they can prove that the diamond they have is a lab grown diamond. 

A lab grown diamond has a mark on its girdle, which is inscribed by a diamond grading institution. This declares that the diamond is authentic and a lab grown diamond. If a jeweller can recognize that, then he/she can tell whether a diamond is lab grown or not.

Yes, they are. These are institutions/organizations which specialize in the inspection and grading of lab grown diamonds. Some of these institutions are:

1. International Gemological Institute (IGI)
2. Gemological Institute of America (GIA)
3. American Gem Society (AGS)
4. Gemological Science International (GSI)
5. Antwerp World Diamond Centre (AWDC)

Many scientists and inventors tried different methods to produce man made diamonds, but they all failed. It wasn’t until the 1890s, Henri Moissan created a diamond by heating a piece of charcoal to 3500°C inside a carbon cubicle. Several people tried to copy and improve this method but were unsuccessful. 

However in 1954, the first man made diamond was formed by the HPHT synthetic diamond making method. This was done by the GE invention of the belt press. It puts a pressure of 1.5 million pounds/square inch and applied temperatures over 2000°C. Using this belt created an HPHT synthetic diamond. The CVD diamond making method came after the HPHT method.

Naturally mined diamonds have been causing pollution and destruction to the environment since the beginning of time. These natural diamonds when mined out of deep caves and diamond mines, take a deadly toll on the environment. The effects on the environment is soil erosion, water pollution, air pollution, carbon emission increase, deforestation and much more.

Other than that, there are various humanitarian issues regarding the mining of natural diamonds. As it has been found that in many cases the miners working in these mines don’t have the proper equipment, clothes or even footwear. They suffer from lung diseases and are prone to many illnesses. It is as if these people are not even considered human, such factors result in human rights violations and earth-mined diamond being looked down upon.

Yes, every lab grown diamond sold shall be certified by authentic institutions/organizations like GIA (Gemological Institute of America), IGI (International Gemological Institute), GSI (Gemological Science International), etc.

These institutions grades on the basis of the 4C’s, provide a certificate. They also add an inscription on the girdle of the lab grown diamonds.