VALUE OF GOLD CONTENT IN JEWELRY

    Value of the gold content in jewelry depends on the gold's purity as well as its weight.
    US$ = grams of gold x (karats x 1/24)x(1/31.10348)x(World Gold Price per Troy ounce)
             Gold purity is measured on a scale of 1 to 24 KARATS (kts):
             24 karat gold - 100%  Au - pure gold, very soft and very easily bent, too soft for jewelry.
             Therefore the gold is alloyed with silver, copper, nickel or zinc:
             22 karat gold - 91.7% Au - still too soft for most jewelry
             18 karat gold - 75.0% Au - for fine jewelry, the best for beauty and durability
             14 karat gold - 58.3% Au - OK for jewelry but the gold is of a duller colour
             12 karat gold - 50.0% Au - not OK for most western jewelry
             10 karat gold - 41.7% Au - legal limit for 'real' gold in USA
             WHITE GOLD is NOT PLATINUM but is a good cheaper substitute = gold+nickel+copper+zinc.

Silver prices are quoted in Troy ounces. 
Silver prices fell in the mid 1900s to historic lows and have not recovered. It can be argued that silver is underpriced but of course the market decides! Nearly all silver is produced from hard-rock mines, although some placer mines have considerable silver, notably in dry desert regions.

1 TROY OUNCE = 31.10348 GRAMS

Platinum prices are quoted in Troy ounces. 
Palladium (Pd) is a precious metal. Pd is a member of the Platinum Group Metals (PGM).
Platinum is often mined with Platinum. Russia is a major palladium miner. Rumours influence prices. Platinum and palladium are mainly produced by hard-rock mines, but placer mines can be locally very important - and highly profitable. 

1 TROY OUNCE = 31.10348 GRAMS

PALLADIUM  Price
 - last 8 hours

Palladium price in US$/kilo

SWISS FRANCS = 1 USD
          

AUSTRALIAN $ = 1 USD