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Weight Conversion Chart for Precious Commodities
Carats Diamond
Grain
Momme Pearl
Grain
Gram Kilogram Ounce
Troy
Penny-
weight
Grain
Troy
Pound
Troy
Ounce
Avoirdupois
Pound
Avoirdupois
1 Carat 1.0 4.0 0.053333 4.0 0.2 0.0002 0.000643 0.1286 3.0865 0.000535 0.0070547 0.0004409
1 Diamond
Grain
0.25 1.0 0.013333 1.0 0.05 0.00005 0.001607 0.03215 0.7716 0.000133 0.0017637 0.0001102
1 Momme 18.75 75 1.0 75 3.75 0.00375 0.120578 2.41125 57.872 0.010048 0.1322751 0.0082672
1 Pearl Grain 0.25 1.0 0.013333 1.0 0.05 0.00005 0.001607 0.03215 0.7716 0.000133 0.0017637 0.0001102
1 Gram 5 20 0.266667 20 1.0 0.001 0.03215 0.643 15.43 0.002679 0.03527 0.0022046
1 Kilogram 5000 20000 266.667 20000 1000 1.0 32.15 643 15432 2.679166 35.2739 2.2046225
1 Ounce Troy 155.51 622.04 8.293867 622.04 31.1 0.0311 1.0 20 480 0.83333 1.09714 0.068571
1 Pennyweight 7.77 31.08 0.144 31.08 1.5517 0.0015517 0.05 1.0 24 0.004166 0.05486 0.003429
1 Grain Troy 0.324 1.296 0.01728 1.296 0.0648 0.0000648 0.002083 0.04167 1.0 0.000173 0.0022857 0.0001429
1 Pound Troy 1866 7464 99.5264 7464.48 373.242 0.3732 12 240 5760 1.0 13.1657 0.822856
1 Ounce
Avoirdupois
141.75 567 7.56 567 28.35 0.02835 0.91146 18.23 437.5 0.075955 1.0 0.0625
1 Pound
Avoirdupois
2268 9072 120.96 9072 453.592 0.4535924 14.5833 291.67 7000 1.215275 16 1.0

 

Modern Basic Diamond (Cut and Polished) Grading System

Color
D E F G H I J K L M N O P Q R S T U V W X Y Z  
(colorless) collection color (white) near colorless slight hint of yellow or brown tone faint yellow or brown light yellow or brown fancy yellow & other colors

Clarity
IF FL VVS1 VVS2 VS1 VS2 SI1 SI2 SI3 I1 I2 I3 I4 I5 P1 P2 P3 P4 P5
flawless (no blemishes) very very slightly included very slightly included slightly included imperfect eye visible promotional
Clarity grades in orange have not (as yet) been endorsed by the Gemological Institute of America.

 

Gold Content   Platinum Content   Silver Content
Karat Parts Fine Gold Type Parts Fine Platinum Type Parts Fine Sliver
1K 0.04167 Bullion 0.9999 Bullion 0.9999
4K 0.1667     Sterling Silver 0.925
6K 0.2500     U.S. Coins 0.900
8K 0.3333        
9K 0.3750        
10K 0.4167        
11K 0.4583        
12K 0.5000        
13K 0.5417        
13.5K 0.5625        
14K 0.5833        
15K 0.6250        
16K 0.6667        
17K 0.7083        
18K 0.7500        
19K 0.7917        
20K 0.8333        
21K 0.8750        
22K 0.9167        
23K 0.9583        
24K 1.0000        
Bullion 0.9999        

Precious Metals
Metal Name
Element Name
Composition
Mineral Crystal System
Density
Hardness
Specific Gravity at 20C
Melting Point
F
C
Gold
Au
Au
Isometric
17.64
2.5-3
19.3
1,948 F
1,064 C
Silver
Ag
Ag
Isometric
10.5
2.5-3
10.5
1,763 F
962 C
Platinum
Pt
Platinum Group Metal
Isometric
14-22
4-4.5
21.45
3,216 F
1,769 C
Iridium
Ir
Platinum Group Metal
Isometric
22.7
6.5
22.56
4,437 F
2,447 C
Rhodium
Rh
Platinum Group Metal
Isometric
12.44
6
12.41
3,565 F
1,963 C
Palladium
Pd
Platinum Group Metal
Isometric
11.55
4.75
12
1,552 F
2,825.6 C
Copper
Cu
Cu
Isometric
8.94
2.5-3
8.92
1,985 F
1,085 C
Sterling silver (.925% fine) is alloyed with 7.5% Copper.

 

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