[Jewelry making - Article 00598] - Re: [Orchid] Orange Peel on Ruby-Zoisite Cab

[R . E . Rourke]

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Isolate definitely..!

    try leaving a margin of zoisite all around the cylinder..cleavage
    seems to be your disadvantage from what you described..the ruby in
    zoisite is more akin to a tourmaline crystal..and i completley agree
    with the copper and diamond lap recommendation.slow speed,cool as is
    possible cutting, and skip the 250 for something closer to 400 to
    start or look at some 3M products that have aggressive cutting
    capabilities with a webbed matrix of ceramic and diamond or ceramic
    and silicon carbide or zirconium..you can also just use a diamond
    wheel on a flexshaft ( continuous rimmed) at no more than 3500 to
    rough out your shape if its well lubricated with wintergreen oil,or
    synthetic methyl salicylate, or a product like liquid bur-lube to
    eliminate chipping,( reduce speed if you get any chatter)...I watched
    a guy at a "granite counter top " place cut a slab of it,followed by
    a slab of labradorite last Saturday..(by slab I mean 64"x 98" pieces)
    he had little chipping with a 60 inch saw blade he prepped with
    diamond spray and kept it wet and cool..the finished pieces were
    glass like with his copper and diamond polishing lap though he said
    he can get away with a polish like Linde A or cerium oxide on the
    ruby and zoisite... 

    a great reference is the international facetter's guild's
    archives..or the eclectic lapidary 

R.E.Rourke
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