Page 16 - AIJV Padraic sample

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Culet
: The lowermost point at the base of a faceted gemstone. Referred to as “open” if a small facet has been applied and
“closed” if there is no facet.
Cut:
1.) In gems, a fashioned gem, as opposed to a rough or uncut gem. 2.) The shaping and polishing of a gemstone. 3.) The
proportions to which a gem is fashioned. One of the “four C’s” in diamond grading.
FGA.
: Fellow of the Gemmological Association of Great Britain. A highly respected gemmological professional qualification
with worldwide recognition. www.gem-a.info
Fluorescence:
A property possessed by some gemstones to change invisible ultra-violet rays into visible light. Useful in identify
the nature of certain gems.
GIA:
Gemological Institute of America.
Girdle:
The name applied to the outer edge of a cut gemstone. The junction between the crown (top) and the pavilion (base).
Head:
1) The upper portion of a ring. 2) The case and mechanism of the wristwatch, not including the strap or bracelet.
NAJA:
National Association of Jewelry Appraisers. A privately owned jewelry appraisal organization.
Natural
: 1.) Generally taken as substance that has been formed without intervention from man. 2.) An area that remains
unpolished on the girdle of a cut Diamond to maintain weight.
Shank:
The part of a ring that surrounds the finger, exclusive of the top (head).