Come distinguere un Grezzo di Diamante Naturale da un Grezzo di Moissanite

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Gemology Course - Lesson 46: Synthetic Moissanite Bought from a Mine. • How to Tell a Natural Diamond Rough from a Moissanite Rough. • Although imitations can sparkle almost as brightly as a diamond, it is important to know that they are not diamonds. The most common imitations on the market have often been created with glass, Moissanite, and Cubic Zirconia (CZ). They are completely different from Diamonds at the atomic level and are easily identifiable by their optical and physical characteristics. • Buying an imitation can be a great option, as long as it is an informed decision. • Specific gravity (hydrostatic specific gravity) measurements range from 3.20 to 3.24, which is significantly lower than the typical Diamond value of 3.52. • Because of the difference in specific gravity, a Diamond and a synthetic moissanite faceted as a round brilliant of the same diameter and proportions will have different carat weights (for example, a 6.50 mm diameter round brilliant diamond will weigh approximately 1.00 ct, while a synthetic moissanite of identical diameter and cut will weigh approximately 0.91 ct). • When examined with a tabletop spectroscope, samples do not show sharp bands, but almost always show a cutoff below approximately 425 nm. This is in contrast to near-colorless or pale yellow Diamonds, which usually show the Cape line at 415 nm. This characteristic may be useful to gemologists with considerable spectroscopic experience, but it should be noted that it can be easy to confuse a 425 nm cutoff with the general darkening in the blue portion of the spectrum. • Synthetic Moissanite is a credible imitation of Diamond. However, it may show a slightly lower brilliance, a higher optical dispersion of light, a lower Specific Gravity and a higher Refractive Index. Moissanite is less hard than Diamond, in fact it boasts a hardness of 9.25 against the 10 of Diamond, furthermore Moissanite is birefringent. • However, Diamond and synthetic Moissanite have overlapping thermal inertia ranges, so both react as Diamond with a thermal probe. • Subscribe to our channel https://www.youtube.com/channel/UCE4H... • so you can watch Minerals, Diamonds and the new Gemology videos that we create every first of the month. • Stay in touch with us on Facebook / gemmologico • On our websites: • https://www.istitutogemmologico.com/ • https://gemologicalinstituteofgenoa.com/ • on Twitter • / genovabrillante

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