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Diamond reports from GIA (as well as other, for-profit sources) are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.
The Gem Testing Laboratory was recognized by the International apex organization of Gem and Jewellery Trade, CIBJO. With increasing consumer awareness, the jewellery industry worldwide began to issue certifications to attest the quality of gem and diamond products. The GII started diamond certification in India in 2000. . [1]
A Rockwell hardness tester. The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1]
The Laboratory passed the ISO 17025 in Jadeite Authentication, Diamond Testing and Gold Testing in 2005, 2009 and 2015 respectively. It also met the ISO 9001 Quality Management Systems Requirements. [4] 1997: Listed on the Main Board of The Stock Exchange of Hong Kong Limited (Stock Code: 0590). 2000: Established the jewellery portal.
We used the diamond tester just to be sure, but in fact it does test as diamond, not as CZ. What you have is a ring that looks like it's eight to 10 carats from the top, and ... it's a diamond.' ...
In 1925, Smith and Sandland of the UK developed an indentation test that employed a square-based pyramidal indenter made from diamond. [11] They chose the pyramidal shape with an angle of 136° between opposite faces in order to obtain hardness numbers that would be as close as possible to Brinell hardness numbers for the specimen.