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CHALCEDONY (CHRYSOPRASE
Golden Apple in Greek (Queensland chrysoprase -…
CHALCEDONY
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Characteristic
One of the first gems to be fashioned, chalcedony has been used in jewelry for almost 3,000 years.
Botryoidal crystal growth habit
This type of gem begins inside cavities and has a bumpy appearance similar to a bunch of grapes.
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CARNELIAN AND SARD
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SARD
Semitransparent to translucent, but its
warm hues are darker & less saturated
ONYX AND SARDONYX
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SARDONYX
Patterend with white or black bands alternating with reddish brown bands that resemble the color of sard
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Source: Brazil, Madagascar, the US and Uruguay
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JASPER & BLOODSTONE
JASPER
opaque chalcedony that displays a variety of colors, typically brownish reds, yellows, and blacks
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BLOODSTONE
A type of jasper w/ a very distinctive look: red to brownish red flecks, colored by iron oxide, scattered across a dark green background
Source: Australia, Brazil, China, India & the US
AGATE
Iris Agate
Semitransparent to translucent and shows iridescent colors when light is transmitted through thin slices
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Fire Agate
More affordable, harder & more durable than opal, yet offers a similar intriguing phenomenon
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- The most familiar chalcedony, a favorite w/ collectors
- One of the first gems to be used for personal adornment
- Fine-quality agate comes from Mexico, Brazil, and Uruguay
- Create a rich palette of patterns & effects
- Curved or angular bands
- Commonly heated, usually to produce orange or orangy red material from yellow to brown material
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