钻石GIA和NGTC的区别主要在于鉴定机构、鉴定标准和服务范围。首先，GIA（Gemological Institute of America）是美国宝石学院，是全球最具权威的钻石鉴定机构之一，而NGTC（National Gemstone Testing Center）是中国国家珠宝玉石质量监督检验中心，是中国珠宝玉石检测方面的权威机构。这两家机构在地域和背景上存在明...
(IDEX Online) - GIA (Gemological Institute of America) has released a software update for its iD100 gem-testing device. The upgrade means the instrument can distinguish natural pink diamonds from laboratory-grown (HPHT and CVD) diamonds and diamond simulants. GIA also released a free update to...
Standard testing showed the stone was not a diamond, and further tests proved it to be a synthetic (lab-grown) moissanite, Hlatshwayo and Eaton-Magaña wrote. They noted simulants are “often” submitted to the lab for diamond grading but are easily rooted out using the standard grad...
It also features a digital image of the submitted pearl(s). This classification service does not include any identification or advanced testing of the submitted material. GIA said the report is only for the three major types of cultured pearls—Akoya, South Sea and Tahitian. The lab will accep...
Gem Certification is provided from Gem Testing Laboratory (Govt. of India Approved ) Testing Reports of Gem Stones covers following important Certification Weight ( In carats ), Colour, Type of Cut, Dimensions, Refractive Index, Conclusions ( i.e. Natural Origin ) & Specific comments ( i.e. ...