Imitation, synthetic or natural diamond?
Don’t confuse the term “imitation” with “synthetic”. Synthetic diamond is a copy of nature down to its molecular structure. A synthetic diamond is the same atomic structure as natural diamond (outside of the crystal growth direction) including the same physical properties. An imitation is a stone that is made to look (or imitate) an authentic diamond such as cubic zirconia or moissanite. Metallic flux inclusions can be detected in synthetic diamond with fiber optic light reflections. If the diamond is inclusion-free look for the typical yellowish to yellowish-green fluorescence in synthetic under long wave ultraviolet light. Internal graining under 10X power may display an hour glass type effect.