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Gold rings and other pieces of jewelry that you find may not always have the Karat Number stamped on them. For example 10K, 18K or 24K may not be on the piece you found.  Instead it may be in decimal format. The chart below will let you convert the decimal and identify what the karat equivalent is. This chart was picked up on the internet and my thanks go to Steve in So. AZ for this information.

Decimal Equivalents of Karats

1K   =  .0417

2K   =  .0833

3K  =  .1250

4K    =  .1667

5K    =  .2083

6K    =  .2500

7K   =  .2917

8K   =  .3333

9K   =  .3750

10K  =  .4167

11K  =  .4583

12K  =  .5000

13K  =  .5417

14K  =  .5833

15K  =  .6250

16K  =  .6667

17K  =  .7083

18K  =  .7500

19K  =  .7917

20K  =  .8333

21K  =  .8750

22K  =  .9167

23K  =  .9583

24K  =  1.000

Silver S.G. pure 10-5, standard 10-31; a lustrous black metal, malleable and ductile used in jewelry and for ornamental and utility articles. Standard silver has 925 parts of pure silver with 75 parts of alloy to the 1,000.

Platinum S.G. 21-5; a hard and ductile grayish-black metal used for mounting gemstones, particularly diamonds. The metal has a high melting point (1755 C.) hence is employed where heat resistance is required.



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