Helpful Trade Information
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 20°C | 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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Email: KenGlasser@DiamondRough.com Telephone: 702-880-9044 |
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