How can I tell moissanite apart from a diamond?
Synthetic moissanite is a diamond stimulant with properties are much different from those of diamond. An experienced gemologist will be able to distinguish between the two. If there is any doubt, the stone can be sent to a qualified independent laboratory for identification. Synthetic moissanite has a lower specific gravity than diamond and will float in methylene iodide. Under magnification, look for the following characteristics: doubling in appearance of facet junctions and inclusions of whitish or reflective needles.