T/CAQI 74-2019 in English
VALIDGems testing—UV-visble spectroscopy
- Issued on:2019-07-03
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
$870.00
$844.00
$844.00
本标准规定了使用紫外可见光谱法鉴定珠宝玉石的术语和定义、方法原理、仪器和设备、操作步骤和方法、主要影响因素及结果表示。本标准适用于借助紫外可见光谱对有特征吸收的珠宝玉石进行鉴定。
Introduction
Analysis of Standard Technical Framework
| Core Elements | Technical Requirements | Typical Applications |
|---|---|---|
| Wavelength Range | 225-1000nm (diamond detection can be reduced to 370-460nm) | Diamond 415nm Characteristic Peak Detection |
| Resolution | ≥1nm | Distinguish adjacent absorption peaks |
| Test Method | Reflection Method (Integrating Sphere Accessory Recommended) | Irregular Gemstone Detection |
Key Detection Technology Points
Typical Gemstone Spectral Characteristics
Diamond: Type Ia has a 415nm absorption peak (N coloration), CVD synthetic diamond shows a 270nm/350nm/373nm triplet (crystal defect).
Ruby: Natural products have a 285nm cutoff edge + 692nm fluorescence peak (Cr), and the fluorescence of diffusion-treated products is significantly weakened.
Control of influencing factors
- Temperature effect: CVD synthetic diamonds require liquid nitrogen refrigeration (-196℃) to enhance characteristic peaks
- Directional difference: Corundum gemstones require multi-angle testing
- Symbiotic effect: Fe element causes the 560nm absorption peak of ruby to redshift
Implementation suggestions
Operation specifications
- Prioritize testing of gemstone table or largest facet
- Set integration time to 150s+30 average scans
- Required test information includes: ambient temperature, testing personnel, instrument model
Key points for data interpretation
| Natural emerald | 683nm+840nm double peaks |
| Hydrothermal synthetic emerald | Missing 840nm peak |
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