Question 1

What is a pennyweight?

Accepted Answer

A pennyweight (dwt) = 1.555 grams = 1/20 troy ounce. Used in precious metals. 20 pennyweight = 1 troy oz.

Question 2

Why is pennyweight abbreviated dwt?

Accepted Answer

From Latin "denarius weight" (d = denarius, wt = weight). Medieval English penny weighed 1/20 of a troy ounce.

Question 3

Is there a difference between mass and weight?

Accepted Answer

Yes! Mass (kg) is amount of matter, constant everywhere. Weight (newtons or pounds-force) is gravitational force on mass, varies by location.

Question 4

Why do jewelry and precious metals use different units?

Accepted Answer

Troy system (troy ounces, pennyweights) has been used for precious metals since the Middle Ages. 1 troy oz = 31.1g vs 1 regular oz = 28.35g.

dwt to g Converter

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