Specifically, distinction can be approached from the following core aspects:
1.Detecting Absorption Wavelengths via Spectrometer Diamonds exhibit different colors because their internal "color centers" selectively absorb specific wavelengths of light. Observing the spectral absorption from ultraviolet (360nm) to infrared (800nm) is the foundation for distinction. Natural diamonds (most commonly Type Ia) typically feature naturally formed, concentrated N2 and N3 centers, which create strong light absorption bands at 478nm and 415nm, respectively.
2.Identifying "Artificial-Only" Color Centers Analyzing the types of internal color centers can determine if a diamond has undergone artificial coloration:
Natural Characteristics: Natural diamonds generally only possess N-series color centers (N1—N9) intrinsically.
Artificial Characteristics: Artificial processes like radiation irradiation and heat treatment forcefully impact the crystal or induce atomic movement, creating crystal defects not found in nature.
3. "Hard Evidence" of Specific Colors (e.g., Purplish-Red) The materials highlight a specific color center that serves as direct proof for differentiation:
N—V Color Center: This structure absorbs wavelengths between 490—640nm, giving the diamond a purplish-red hue.The literature explicitly notes that this N—V color center can only be produced in synthetic (artificial) diamonds.Therefore, any purplish-red diamond containing this specific color center can be definitively identified as an artificial product.
If the spectrum detects color centers from the H series (H1—H18), GR series (GR1—GR8), R series (R9—R11), or TR series (TR12—TR17), it proves the diamond has undergone an artificial manufacturing process.
4. Considering Color Rarity Artificial coloration is often utilized to produce "precious" hues rarely found in nature. For instance, specific "precious" yellow tones created via 600~800℃ heat treatment (associated with N3 color centers), as well as purplish-red colors, are exceptionally rare in natural diamonds.When encountering fancy color diamonds with such flawless and rare hues, it should arouse high suspicion, necessitating spectroscopic testing to verify whether their color center structures were artificially induced.