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level: Weight, Density and SG

Questions and Answers List

Question	Answer
What measurement of weight are gemstones most usually sold by?	Carat
What is the weight of one carat in terms of grams?	0.2g
Carat weight can also be measured in points, how many points are there in one carat?	100
What would be more expensive, a) a single stone weighing 1ct, or b) 100 stones weighing 1 point (0.01ct) each?	a
The density of a material is it's weight relative to what?	Volume
What is the term used to describe the ratio of weight of a gemstone to the weight of an equal volume of water?	Specific Gravity
What formula is used to work out the specific gravity of a gemstone?	Gemstone weight divided by difference in weight in water
What is the specific gravity of amber?	1.05 - 1.10
What is the specific gravity of opal?	2.0 - 2.2
What is the specific gravity of quartz?	2.6 - 2.65
What is the specific gravity of a diamond?	3.52
What is the specific gravity of beryl (emerald)?	2.65 - 2.80
What is the specific gravity of corundum (sapphire)?	3.80 - 4.05
What three factors are needed to be able to give a weight estimation of a mounted gemstone?	Measurements