a 22.75 carat Rubellite Tourmaline at an upscale auction >a general sense of where the price per carat can fall on >these stones would be incredibly helpful in determining whether or >not to go the GIA route. From USD$ 250.00/carat to USD$ 650.00/carat the stone itself is absolutely clean - not a single imperfection eye or under loupe.
That would put it in the up to USD$ 650.00/carat area.
A GIA cert will not give you any price - just certify
that it is indeed tourmaline. An AGL cert may be a good bit cheaper
and just as acceptable.
Robert P. Lowe Jr.