Moissanite and Diamond Identification:

Synthetic Moissanite, also known as synthetic moissanite, synthetic moissanite (chemical composition SiC), has a dispersion of 0.104 larger than that of diamond (0.044), a refractive index of 2.65-2.69 (diamond 2.42), and has the same diamond luster as diamond. The "fire" is stronger and closer to a diamond than any imitation ever made. This is manufactured by C3 Company in North Carolina, and has the patent of producing moissanite in countries all over the world, and is being promoted and applied all over the world.

According to the 4C grading standard of diamonds, the color, clarity, cut, and carat characteristics of synthetic silicon carbide are as follows:

Color: colorless, blue, green, yellow-green, yellow Crystal system Hexagonal system

Hardness: 9.25

Luster: glass, sub-metallic luster

Streak: grey-green

Transparency: Transparent to Opaque

Density: 3.218 - 3.22g/cm³

Moissanite and Diamond Identification:

1. Specific gravity: Moissanite is lighter than diamond, that is, their specific gravity is different. The specific gravity of diamond is 3.52, while the specific gravity of moissanite is only 3.22. For unmounted materials, it is easy to distinguish the two with methyl iodide specific gravity (specific gravity 3.32).

2. Hardness: The hardness of moissanite is smaller than that of diamond, so scratching the surface of moissanite with a diamond hardness tester will leave scratches, while the scratching plan will not leave scratches on the surface of diamond.

3. Conductivity: According to the GIA report, 80% of moissanite are electrical conductors (only blue and blue-gray type IIb diamonds are conductive in natural diamonds). Common white/light yellow diamonds are non-conductive, so a conductivity meter or Moissanite can be used to identify diamonds and moissanite.

4. Refractive index: The refractive index of moissanite is different from that of diamonds, and the reflective characteristics of moissanite are also different from those of diamonds. Experienced diamond appraisers can distinguish the two; in addition, moissanite has birefringence, so careful observation It is not difficult to see the ghosting of the moissanite ridgeline and culet. At this time, when the viewing angle is changed, the ghosting will still appear.

5. Biaxial optical characteristics: Due to the biaxial optical characteristics of moissanite, the observation of its ghosting characteristics depends on the angle of observation. The ghosting is more obvious when observed from the main facet of the mesa, although the mesa is vertical to the moissanite crystal. The c-axis will reduce the ghosting effect. Focusing on the culet can still see the reflection ghosting of the table and crown facets, which is completely different from the crown reflection of single-refractive diamonds.

6. Polished pattern: Moissanite’s waist polished pattern is parallel to each other, which is completely different from diamond. And due to the difference in different directions, the polishing direction should be constantly adjusted during the diamond polishing process, while moissanite can be polished in the same direction. This is especially evident between adjacent facets.

7. Cut: Most of the cut moissanite has rounded ridges, which is completely different from diamonds with sharp ridges.

8. Inclusions: The inclusions of diamonds are different from those of moissanite. All of the Moissanites identified have some inclusions that are arranged in parallel needles. Thin parallel lines of reflection are seen in some moissanite.

9. Color: Since moissanite launched a DF-level color that is synchronized with diamonds in 2015, it is difficult to distinguish the two from color.