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Há 5 dias · Stuller has a strategic service arrangement with GIA (Gemological Institute of America), which is a separate entity from Stuller. It's staffed by GIA specialists who use GIA's proprietary technology to perform their work. GIA’s equipment screens round melee diamonds in sizes 0.005 carat through 0.24 carat.
Há 3 dias · The finale of the 16 th Singapore National Crystal Growing Challenge was held at NUS Chemistry on Sat, 25 May 2024. This is a biennial event for secondary school, junior college and polytechnic students. During the crystal growing process, the students learn about the chemical processes behind the crystallisation and the science and art behind ...
Há 5 dias · Gemological Institute of America (GIA. ) GIA ® is the leading source in knowledge and education for diamonds and gemstones. The nonprofit organization has made countless innovations in the field of gemology and continues to educate and enable jewelers of the future. Browse Stuller's inventory of GIA products.
Há 2 dias · Topaz is allochromatic, which means that its color is caused by impurity elements or defects in its crystal structure rather than by an element of its basic chemical composition. The element chromium causes natural pink, red, and violet-to-purple colors in topaz. Imperfections at the atomic level in topaz crystal structure can cause yellow ...
Há 4 dias · The diamond’s total depth or height is measured from the surface of the table to the culet, in other words, from top to bottom. This measurement is expressed as a percentage of the average girdle diameter. Total Depth % = Total Depth (mm) / Average Girdle Diameter x 100. Total depth percentage is one of the main factors when determining a ...
Há 19 horas · 5. Checking for Hallmarks and Certifications. When buying a gold necklace, look for hallmarks and certifications that authenticate its quality and purity. Hallmarks are markings stamped on the necklace that indicate the metal’s purity and manufacturer’s mark. Additionally, certifications from reputable organizations like the Gemological ...
Há 4 dias · Stuller Gemological Lab™ – Our senior gemologist holds the prestigious FGA qualification (Fellow of the Gemological Association of Great Britain) A strategic services arrangement with GIA ® in which GIA ® staff screens all Stuller’s melee parcels on-site as they independently operate the GIA-owned system in a dedicated, secure space.
