Upload
roberta-leonard
View
219
Download
0
Tags:
Embed Size (px)
Citation preview
GEMSTONES
DEFINITION MINERALS that are cut RARE= valuable Usually above 7 on hardness scale
Gold Pure gold is
malleable, heavy and expensive!
Gold in jewelry is an alloy (mix of metals)
K= % of gold 24K= 100% gold 14K = ?
The 5 C’s Cut Clarity Color Carat Cost
CUT Ground down on a grinding wheel
Faceting- for TLT-TPT Lets light through mineral; adds brilliance
Cabachoning- for OPQ
Diamonds in the “rough”
Round brilliant
Cabachons
Clarity Amount of imperfections
Specs Cracks discoloration
Color Colored gems= deep color, more $$
Diamonds= D-Z scale (see handout) Exception is Z+ fancy diamonds are
colored diamonds- most rare of all
Fancy Diamonds More rare than
traditional diamonds.
Carat Weight of gemstone 1 ct= 200 mg 100 pts.= 1 carat TGW= total gem
weight for many stones together
Cost Depends on previous 4 C’s (especially
clarity and color)
FAMOUSDIAMONDS
How Do Diamonds Form?Contrary to what many people believe, most diamonds do not form from coal
CULLINIAN 9
CULLINAN ISTAR OF AFRICA530 CTS.
Cullinan II: 317 cts.
Kohinoor Originally 186 cts. Now 108 cts. Queen of England
HOPE DIAMOND; 65 cts. New setting Nov. 2010
Smithsonian
Tiffany yellow
PINK- $2-3 million.
DeYoung Red5.03 cts.
$5 million
Taylor-Burton Diamond(33 cts. -ring, $8 mill) 68 ct. necklace
Smithsonian diamonds
MILLENIUM STAR- 230 CTSD, IF (“Millenniums come and go, but a diamond is forever” DeBeers
The Regent Diamond 410 carat
diamond when originally found.
Later cut down to 140 carats.
Today is at The Louvre.
Birthstones
GarnetJanuary birthstone
ALEXANDRITE
1.6 ct
$16,000
OPAL(hydrated quartz)
TOPAZNovember birthstone
EmeraldMay birthstone
PeridotAugust Birthstone
Most expensive gemstones http://www.toptenz.net/top-10-record-breaki
ng-gemstones.php
Synthetic gemstones Advantages?
Less expensive Less flawed
Disadvantages?