IGI与GIA对比

官方站点及证书查询上，GIA相较IGI更加精良，IGI的证书无法下载居然。

1. GIA查询，https://www.gia.edu/report-check?locale=zh_CN&reportno=6301940519

2. IGI查询，http://lookup.igi.org/index.php/verify-your-report/?r=f6g78013#The4cs/

从红迪的讨论看，GIA的标准更严格（评级含金量更准更高），GIA是行业龙头、行业标准。

参考链接：

1. https://www.reddit.com/r/Diamonds/comments/q927d1/does_a_gia_or_igi_diamond_certification_make_a/

2. https://www.reddit.com/r/EngagementRings/comments/psum5s/help_igi_vs_gia_does_the_type_of_certification/

3. https://www.reddit.com/r/Diamonds/comments/jkgczm/giagraded_lab_diamonds_the_results_are_in/

有些严谨对比IGI和GIA的报告：

1. https://www.diamondscreener.com/education/comparing-diamond-certification-labs-gia-vs-igi-grading-and-prices/

2. https://www.diamonds.net/News/NewsItem.aspx?ArticleID=43417