Yes, they are true chemical elements but man made.
If you are not a jeweler than the best way is to ask for gemological report at GIA, EGL, IGI. Which will confirm the origin of diamond and it's characteristics. For more information on synthetic diamond follow my link below.
The Actinoids group contain all the synthetic elements. All the elements that have an atomic weight of 95 and above do not occur naturally. They are part of the actinoid elemental group.
The arrangement of atoms is the same in synthetic and natural diamond.
92
Diamond Nexus offers both synthetic diamonds(made with pure carbon) as well as diamond simulants that are not made with pure carbon, but are nearly identical to a natural diamond besides having different elements. The pure carbon gems are only available in a canary color though.
Synthetic Elements are used in smoke detectors.
All the synthetic elements on the Periodic Table appear after Uranium (atomic no. 92). These are the only synthetic elements.
Yes, all synthetic elements are man made.
Yttrium and aluminum elements can be combined to create a simulated diamond-like synthetic element. Think of it in the same way as Cubic Zirconium.
The value of a synthetic diamond is not as easy to determine as that of a real diamond. It's value may be exactly what a buyer will pay you for the stone.
Synthetic elements might be harmful if they are ingested or inhaled. The elements can cause damage to the lungs, brains, and heart.
Synthetic or man-made elements. Obviously synthetic sounds significantly cooler.
not reactive
einsteinium,......
radioactive
Radioactive