You can calculate the total carat weight by adding the individual carat weight of each stone. Without a carat weight of each of your 15 stones, it is not possible to devise a sum total carat weight.
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National Geographic published a cover photograph, for their story on cutting and polishing diamonds in India, which showed diamonds small enough to fit into the seed well on the side of a strawberry. These diamonds are probably smaller than .01 carats. A 'one cent' diamond weighs one-one-hundredth of a carat -- .01: its mm size will depend on its cut.
If a .03 carat stone is about 2mm in diameter, and appears to be about the size of the letter 'o' on a typewriter, then a 1mm stone is about half that size It doesn't work like that I am afraid. A 1mm diamond is approx 0.5 points or 0.005 carats. Commonly known as a diamond chip.
From the Web site, below: "Magic Size - People tend to prefer certain sizes over others. These Magic sizes also greatly affect the loose diamonds price. For example, a 1.00 carat stone is considered to be a magic size. If a loose diamond weighs .99 carats the price per carat will be much cheaper than one of the same color and clarity that weighs 1.00 carats. In this case it is not the rarity of the stone but people's preference that dictates the diamonds price. Not even the most experienced diamond dealer could tell the difference between a .99 carat diamond and a 1.00 carat diamond yet the price is significantly different."
A jeweller can estimate the carat size of a stone, however, to learn its true carat weight, a stone must be removed from its setting and weighed.
1 carat = 100 cents = 6.5 mm = solitaire