Dynamical Gemological Characteristics of Irradiated CVD Synthetic
Diamond Upon Medium-Low Temperature and Normal Pressure
Annealing
YAN Jun1, YAN Xue-jun1, WANG Chao2, CHEN Pei-li1, ZHOU Wu-bang1, LOU Liu-hong3, ZHENG Tao-jing1, BAI Hui-min4
1. Zhejiang Fangyuan Test Group Co., Ltd., Hangzhou 310013, China
2. Ningbo Institute of Product and Food Quality Inspection (Ningbo Fiber Inspection Institute), Ningbo 315100, China
3. Shaoxing Testing Institute of Quality and Technical Supervision, Shaoxing 312000, China
4. Zhejiang Liuxiangti Technology Co., Ltd., Longyou 324400, China
Abstract：The optical properties, fluorescence and phosphorescence, and dynamical gemological characteristics of the chemical vapour deposition (CVD) synthetic diamonds subjected to a multistage treatment process, including highpressure high temperature (HPHT) treatment, high energy electron irradiation, and finally medium-low temperature (500～1 000 ℃) and normal pressure annealing, were investigated by DiamondViewTM instrument and photoluminescence (PL) spectrum. The results showed that CVD synthetic diamonds treated with EI could display a series of optical defects, such as 470, 489, 492, 504, 509, 580, 741, and 744 nm. More interestingly, these above defects had different temperature tolerance behaviors. At the annealing temperature of 600 ℃, the characteristic peaks at about 489, 492, and 580 nm disappeared. Moreover, approximately 470, 741, and 744 nm characteristic peaks disappeared at the annealing temperature of 900 ℃. The peak about 504 nmcaused by electron irradiation gradually shifted blue to 503.2 during the annealing temperature rising from 500 to 900 ℃. Meanwhile, the NV vacancies in diamonds recombined or escaped during HPHT treatment. However, these NV defects could occur when the diamond was treated with HPHT, irradiation, and finally annealing. Moreover, the NV concentration increased with the increase in annealing temperature. In addition, the diamond changed from colorless after HPHT treatment to blue-green after heavy EI. It can be finally transformed into orange-yellow or pink with the increasing annealing temperature. The NV vacancy generated during annealing was responsible for the orange, yellow, or pink diamond. The result of this work can provide certain reference for the detection and determination of the synthetic properties of diamonds and their corresponding treatment processes, as well as the development of functional materials in related fields.
Key words：CVD synthetic diamond; HPHT; Electron Irradiation; Annealing; Optical defect
严 俊，严雪俊，王 超，陈佩利，周武邦，娄六红，郑韬静，白慧敏. 辐照处理合成钻石中低温常压退火下的动态宝石学特征[J]. 光谱学与光谱分析, 2025, 45(08): 2156-2163.
YAN Jun, YAN Xue-jun, WANG Chao, CHEN Pei-li, ZHOU Wu-bang, LOU Liu-hong, ZHENG Tao-jing, BAI Hui-min. Dynamical Gemological Characteristics of Irradiated CVD Synthetic
Diamond Upon Medium-Low Temperature and Normal Pressure
Annealing. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(08): 2156-2163.
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