Exam (elaborations)
GIA COLORED STONES QUESTIONS AND ANSWERS
- Course
- Institution
GIA COLORED STONES QUESTIONS AND ANSWERS
[Show more]
Seller
Follow
selftest
Reviews received
Content preview
GIA Colored StonesTerms in this set (684)
A natural, inorganic substance with a characteristic chemical composition and
Mineral
usually characteristic structure.
Mixed cut A cutting style that combines brilliant-cut and step cut facets.
Abrasions Tiny nicks and pits caused by wear and damage to a gem's facet edges or culet.
, A pattern of dark vertical lines or bands shown by certain gems when viewed
Absorption spectrum
through a spectroscope.
Adularescence The cloudy bluish white light in a moonstone, caused by scattering of light.
Chalcedony with a curved or angular bands or layers that differ in color and
Agate
transparency .
Aggregate A mass of tiny, randomly oriented crystals.
Common name for the Pinctada fucata oyster and the natural or cultured pearls it
Akoya
produces.
Allochromatic A gem colored by trace elements in its crystal structure.
A deposit where gems are eroded from their source rock, then transported away
Alluvial deposit
from their source and further concentrated.
Amorphous Lacking a regular crystal structure.
Aragonite A crystalized form of calcium carbonate found in nacre.
Assembled stone Two or more separate pieces of material joined to form a unit.
Asterism Crossing of chatoyant bands, creating a star in the dome of cabochon.
Atom The basic structural unit of all matter.
A glittery effect caused by light reflecting from small, flat inclusions within a
Aventurescence
gemstone.
Background color An opal's bodycolor, independent of its play-of-color.
A bead used as the core of a cultured pearl, usually made from a freshwater mussel
Bead nucleus
shell.
Bleaching A treatment that uses chemicals to lighten or remove color.
Blemish Characteristic or irregularity confined to the surface of a polished gemstone.
Trade term for a highly prized, vivid blue adularescence displayed by the finest
Blue Sheen
moonstone.
Bodycolor A gemstone's basic color, determined by its selective absorption of light.
Botryoidal A crystal growth habit with a bumpy appearance similar to a bunch of grapes.
Boulder opal Thin layers of precious opal, cut to include matrix.
Boule A cylindrical synthetic crystal produced by the flame-fusion process.
Light that eventually returns to the eye after entering a gem through the crown,
Brilliance
reflecting off its pavilion facets, and exiting back through the crown.
Cutting style with triangular or kite-shaped facets that radiate from the center
Brilliant cut
toward girdle.
Cabochon A smoothly rounded polished gem with a domed top and a flat or curved base.
Calcareous concretion A non-nacreous natural "pearl".
Calibrated sizes Gemstone sizes cut to fit standard mountings.
A gem carving style in which the design often a women's profile, projects slightly
Cameo
from a flat or curved surface.
Cavity An opening that extends into a gem from the surface.
Tiny tension cracks in a moonstone that interfere with adularescence and reduce
Centipedes
value.
A process in which ground powder is heated, sometimes under pressure, to produce
Ceramic process
a fine-grained solid material.
A document that indicates a stone's geographic origin, based on its inclusions and
Certificate of origin
trace element chemistry.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller selftest. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R167,75. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now
Recently viewed by you
