OK; now that I know the terminology, what are the more important factors?
The first six terms describe the geometry of the diamond. Fire and sparkle are variable characteristics that are determined by the proportions of the diamond. Modifying proportions to increase one may decrease the other! Look for a good balance of fire and sparkle. Fluorescence occurs naturally and synthetically. It is not common, so jewellers will try to command a higher price. In general, it does not change the value of the stone, but severe fluorescence gives stones an oily appearance in sunlight, and decreases its value. Naturals if not severe are not bad. Small feathers are common. Any crack that extends more than 1/3 of the way through the stone may cause structural problems. Back to top How many facets does a diamond have? A. On a brilliant full-cut stone, there are 58 facets; 32 facets plus the table above the girdle and 24 facets plus the culet below the girdle. Some stones with only 18 facets are refered to as “single cuts”. Back to top What are the “four C’s” relating to dia
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