Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
36 Cards in this Set
- Front
- Back
|
Blemish
|
surface of polished stone
|
|
|
brilliant cut
|
triangular or kite-shaped facets, radiate from center toward girdle
|
|
|
cabochon
|
smoothly rounded domed top & flat or gently curved base
|
|
|
caliber cuts
|
gemstones cut to strict proportions
|
|
|
cameo
|
figure projects slightly from flat surface, often woman's profile
|
|
|
clarity characteristic
|
term for inclusions & blemishes
|
|
|
clarity
|
relative freedom from inclusions & blemishes
|
|
|
cleavage
|
flat break along weakest structural direction, can be step-like
|
|
|
density
|
how heavy object is in relation to its size
|
|
|
designer cuts
|
artistic cuts, special proportions w/no limit except gem's rough shape & optical characteristics
|
|
|
durability
|
withstand wear, heat, chemicals
|
|
|
eye-clean
|
inclusions visible only under magnification
|
|
|
facet
|
flat polished surface
|
|
|
fancy shape
|
any shape other than round (including marquise, emerald, heart, oval, pear)
|
|
|
fantasy cut
|
free-form, alternating curved & flat surfaces
|
|
|
feather
|
general term for break in stone
|
|
|
finish
|
quality of polish & precision of cut
|
|
|
fluid inclusion
|
pocket filled w/fluids, gas bubbles, tiny crystals; created by environmental changes during crystal growth
|
|
|
fracture
|
any break other than cleavage or parting
|
|
|
included crystal
|
small crystal trapped inside a large gem as it grows
|
|
|
inclusion
|
characteristic enclosed within or reaching its surface from interior
|
|
|
intaglio
|
design engraved into surface
|
|
|
metric carat
|
int'l unit measurement for weight. 1 carat = 1/5 gram = .200 gr.
|
|
|
mixed cut
|
combines brilliant & step cut
|
|
|
parting
|
flat break along twinning plane
|
|
|
per-carat price
|
price divided by its weight
|
|
|
point
|
1/100 of carat (.01 ct)
|
|
|
proportion
|
angles & relative measurements of polished gem & relationships between them
|
|
|
scintillation
|
flashes of light reflected from polished gem when observer, gem, or light source moves
|
|
|
shape
|
face-up outline
|
|
|
silk
|
needle-like inclusions create phenomena like cat's-eyes & stars
|
|
|
specific gravity
|
ratio of gemstone's weight to weight of equal volume of water. abbrev. SG
|
|
|
step cut
|
mainly square & rectangular facets arranged in concentric rows
|
|
|
style
|
arrangement of stone's facets (brilliant, step, mixed cuts)
|
|
|
total gem weight
|
combined weight of all gems in a piece of jewelry
|
|
|
twinning plane
|
location of a direction change in stone's crystal structure during growth
|
