[Jewelry making - Article 00805] - [Orchid] Tube setting 101

[Milt Fischbein]

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Hi Carol

>     so how do you order the right size of tubing from a catalogue for
>     that size of stone without the benefit of tubes physically in hand
>     to match the stone to? 

    I have done lots of tube setting, but usually with smaller stones,
    say 2 mm No reason why you can not tube set a 4 mm stone. The trick is
    to get a tube that will give you enough tube wall to provide a seat
    for your stone as well as allow you to have enough left over on the
    outside to push over your stone (like a bezel) to secure the stone. I
    am assuming that the stone you want to set is round ie brilliant
    cut. You need to measure your stone diameter with a calliper in order
    to make sure that it is really 4 mm in diameter. The inner diameter
    (ID) of the tube must be smaller than the stone diameter. The outer
    diameter (OD) of the tube must be larger than the diameter of the
    stone. For a 4 mm stone I would recommend a wall thickness of about
    0.4 mm or more. This would mean that the inner diameter would be
    about 3.6 mm and the outer diameter would be about 4.4 mm Wall
    thickness is (OD-ID)/2 

    I looked in the Rio Catalogue The closest I could find was their
    0.188" tube (item #100-905). Note the catalogue is in inches and not
    millimetres Unfortunately, this tube is not suitable for a 4 mm stone
    The tube has an OD of.188" (4.77mm), and ID of 0.156" (3.96 mm) and
    a wall thickness of 0.016" (0.4 mm) This tube would be suitable for a
    4.3 or 4.4 mm stone 

    I could not find anything in the Rio catalogue that would work on a
    4 mm stone. 

    You will have to check other supply houses for a tube with the
    dimensions that I suggested. 

    Good luck finding the tube you need. 

Regards
Milt Fischbein
Calgary Alberta
Canada

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