Abstract: A non-destructive and rapid examination method is proposed for the color-grading of diamonds. A characteristic Raman peak of diamond, after being properly processed, can be used for this purpose. This novel method can be applied to color-grading of diamonds of both loose and mounted ones with satisfactory results.

Abstract: A non-destructive and rapid examination method is proposed for the color-grading of diamonds. A characteristic Raman peak of diamond, after being properly processed, can be used for this purpose . This novel method can be applied to color-grading of diamonds of both loose and mounted ones with satisfactory results.

Abstract: This invention is within the technical field of corundum appraisal, and it involves an examination method to determine whether corundum has undergone beryllium diffusion treatment. Procedurally, a highly sensitive Raman spectrometer (S/N>10,000) is used to scan and examine the samples. The spectrometer is fitted with a tailor-made probe having a large facula and surface area. Specially developed software is then used to perform an intensity correction and a background elimination to obtain a specific Raman spectral range (250-120 cm-1) with the corrected intensity and a smooth baseline. The corrected and standardized Raman characteristic peak at 804 cm-1 (side-band) is used as a basis to determine whether the corundum has undergone beryllium diffusion treatment. This invention method has the advantages of being non-destructive, simple, fast, and practical. Also, it can accurately determine whether corundum has been treated.

Abstract: The origin of a gemstone often governs its value. Traditional jewelry appraisals attempted the recognition of the origin of a gemstone based on criteria of its physical properties include, but not limited to color, refractive indices, and microstructure. However, these criteria, in addition to its inclusions, are generally failed to resolve the locality and origin of a gemstone without doubt. Through careful examination and compilation of Raman spectroscopic data, Argyle pink diamonds can be classified as two types according to their characteristic Raman spectra. The method of the present invention provides sound basis for the rapid determination of the authenticity of the Argyle pink diamonds by Raman spectroscopy.

Abstract: This invention is within the technical field of distinguishing between natural diamond and synthetic CVD and HPHT diamonds, involves an examination technique using the Raman spectra. Procedurally, a highly sensitive Raman spectrometer (S/N>10,000) is used to scan and examine the diamond sample. The spectrometer is fitted with a tailor-made probe that has a large facula and surface area. Specially developed software is then used to perform an intensity correction and a background elimination to obtain a specific Raman spectral range (250-2800 cm?1) with the corrected intensity and a smooth baseline. Next, the Raman peak intensity of 2030 cm?1 (the post-correction and -standardization characteristic peak) is used as a basis to distinguish between natural diamond and synthetic CVD and HPHT diamonds. This method has the advantages of being non-destructive, simple, fast, and practical identification for diamonds.

Abstract: The method of rapid identification of natural and synthetic diamonds using a third-order Raman spectra is to make a diamond third order under large-scale comparative studies with synthetic diamond (CVD & HPHT) to distinguish natural and synthetic diamonds with their differences in Raman peaks. This analysis of the differences in characteristic peak phenomenon can form the basis of a rapid identification and analytical technique.

Abstract: This invention is within the technical field of distinguishing between natural diamond and synthetic CVD and HPHT diamonds, involves an examination technique using the Raman spectra. Procedurally, a highly sensitive Raman spectrometer (S/N>10,000) is used to scan and examine the diamond sample. The spectrometer is fitted with a tailor-made probe that has a large facula and surface area. Specially developed software is then used to perform an intensity correction and a background elimination to obtain a specific Raman spectral range (250-2800 cm?1) with the corrected intensity and a smooth baseline. Next, the Raman peak intensity of 2030 cm?1 (the post-correction and -standardization characteristic peak) is used as a basis to distinguish between natural diamond and synthetic CVD and HPHT diamonds. This method has the advantages of being non-destructive, simple, fast, and practical identification for diamonds.

Abstract: This invention is within the technical field of corundum appraisal, and it involves an examination method to determine whether corundum has undergone beryllium diffusion treatment. Procedurally, a highly sensitive Raman spectrometer (S/N>10,000) is used to scan and examine the samples. The spectrometer is fitted with a tailor-made probe having a large facula and surface area. Specially developed software is then used to perform an intensity correction and a background elimination to obtain a specific Raman spectral range (250-120 cm-1) with the corrected intensity and a smooth baseline. The corrected and standardized Raman characteristic peak at 804 cm-1 (side-band) is used as a basis to determine whether the corundum has undergone beryllium diffusion treatment. This invention method has the advantages of being non-destructive, simple, fast, and practical. Also, it can accurately determine whether corundum has been treated.