An educational institution for gemological studies that enjoys international acceptance and trains gemologists from all over the world.
Alloy
The mixture of two or more metals to improve durability or tensile strength. Many alloys are used in jewellery, such as rose gold which is an alloy of yellow gold and copper.
Appraisal
A documented estimate by experts, of the approximate retail value of an item. Appraisals are most often used for insurance purposes to estimate replacement value.
Asscher-Cut Diamond
A diamond cut named after its inventor, Joseph Asscher, this is a square cut diamond with 72 facets.
Approx.Weight
This is an approximate weight with +/- 5% tolerance