[Jewelry making - Article 00344] - Re: [Orchid] Diamonds & sizes

[Neilthejeweler]

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    I think you'll find that charts may not be completely accurate in
    their opinion of MM vs CT. I see charts that state a 2.0mm diamond
    is .03ct, but often when I'm billed that 2.0 weighs a bit more. 

    If one uses the charts for estimating costs its not a bad idea to add
    a point or two on melees. It may not sound like much of a discrepancy
    but suppose you're estimating your cost for 35 2.0mm diamonds and
    suppose the price is $800 p/ct. If they weigh .03 each your tw is
    1.05ct or $840. Should they weigh .035 each your weight is now better
    than 1.22ct or $980. By the time you keystone it the difference
    becomes $280. 

    I don't know about anyone else but I don't like eating $280 just
    because of faulty estimating based on taking someone else's word.
    That's the trouble with written anything, it becomes accepted as
    fact when in truth it may or may not be. And its pretty embarrassing
    to ask your client for more money because you made a mistake. 

    On the flip side, if you order by carat, "Sam I need some three
    pointers" You might get 1.9mm or you might get 2.0mm. Again doesn't
    sound like much but depending on the setting (in the aforementioned
    35 stone suite) the total length difference becomes 3.5mm. That
    could spoil your day. 

    Usually when I'm plotting out a design I do it by MM requirements.
    But I will estimate costs a little higher than theoretical, give a 
    retail price and stick to it.
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