gemstones. definition minerals that are cut rare= valuable usually above 7 on hardness scale

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

http://av.rds.yahoo.com/_ylt=A9ibyJwNyuBDvQsA4FxvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11t63j8vj/EXP=1138891661/**http:/www.nataliek.com/perfect/index.php

Diamonds in the “rough”

Round brilliant

Faceting

http://www.prettyrock.com/php/product-detail.php?item=ULTRATEC%20V2%20RH96%20Faceting%20Machine&return=/ultratec.htm

Cabachoning

http://av.rds.yahoo.com/_ylt=A9ibyKKzkd9DDkEAE3VvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=12432bd3c/EXP=1138811699/**http:/www.rockhounds.com/rockshop/oplc_cab.html

Cabachons

http://av.rds.yahoo.com/_ylt=A9ibyKvZkt9DGfYA8DhvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=12cin0sqm/EXP=1138811993/**http:/www.rocksnpots.com/Vintage/Turquoise/turqpg3.html

http://av.rds.yahoo.com/_ylt=A9ibyKvZkt9DGfYA7jhvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11mk0e2je/EXP=1138811993/**http:/www.ybol.com/globe/cab.html

http://av.rds.yahoo.com/_ylt=A9ibyKk8k99DFCQB_2hvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=125jr1tjq/EXP=1138812092/**http:/www.gemsandjewelryrus.com/bandedagate.html

Clarity Amount of imperfections

Specs Cracks discoloration

http://www.pgrgem.com/diamond/four_c.html

Color Colored gems= deep color, more $$

Diamonds= D-Z scale (see handout) Exception is Z+ fancy diamonds are

colored diamonds- most rare of all

D, Fl I 3

http://av.rds.yahoo.com/_ylt=A9ibyKWOn99DpJsA6TBvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=121tjedve/EXP=1138815246/**http:/www.caratking.com/education/basics.htm

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

http://www.altobelli.com/html/the_british_crown_jewels.html

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)

http://av.rds.yahoo.com/_ylt=A9ibyKD8oPpB03cBaA5vCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=1247h3atf/**http:/www.uni-wuerzburg.de/mineralogie/gallery/Seiten/opal.htm

http://av.rds.yahoo.com/_ylt=A9ibyKD8oPpB03cBbA5vCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11g8e66mk/**http:/www.opalsociety.org/opal_express.htm

http://av.rds.yahoo.com/_ylt=A9ibyKD8oPpB03cBjA5vCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11ue2p630/**http:/www.opalhorizon.com/the_opal_horizon_advantage.cfm

TOPAZNovember birthstone

http://av.rds.yahoo.com/_ylt=A9ibyKNulPpBkkMAkghvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=12ad0q1vl/**http:/www.minerals.net/mineral/silicate/neso/topaz/images/topaz2.htm

http://av.rds.yahoo.com/_ylt=A9ibyKNulPpBkkMAqghvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=1210tlbpm/**http:/www.astergem.com/Diffused_Topaz/imagepages/image2.htm

http://av.rds.yahoo.com/_ylt=A9ibyKNulPpBkkMAmghvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11h33nius/**http:/www.gemsuite.com/gemstones/topaz.html

http://av.rds.yahoo.com/_ylt=A9ibyKNulPpBkkMAnAhvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11dc12c6f/**http:/www.foggymountaingems.com/item/22

EmeraldMay birthstone

PeridotAugust Birthstone

http://av.rds.yahoo.com/_ylt=A9ibyJ_WlPpB5HQA7mBvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11jfc8ibd/**http:/www.gemsuite.com/gemstones/peridot.html

http://av.rds.yahoo.com/_ylt=A9ibyK3xlPpBCooAgmlvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=11ofum35n/**http:/www.uwm.edu/Course/422-100/olivine.data.html

Most expensive gemstones http://www.toptenz.net/top-10-record-breaki

ng-gemstones.php

http://www.toptenz.net/top-10-record-breaking-gemstones.php

Synthetic gemstones Advantages?

Less expensive Less flawed

Disadvantages?

http://av.rds.yahoo.com/_ylt=A9ibyJxIqd9DJtcAroZvCqMX;_ylu=X3oDMTBvMmFkM29rBHBndANhdl9pbWdfcmVzdWx0BHNlYwNzcg--/SIG=128pb2b5h/EXP=1138817736/**http:/www.lab-gemstones.com/imitation_amethyst.html

gemstones. definition minerals that are cut rare= valuable usually above 7 on hardness scale

opq diamonds

colored diamonds

traditional diamonds

z fancy diamonds

dz scale

fancy diamondsmore rare

brilliance cabachoning

expensive gemstoneshttp

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