That depends on the thickness or diameter of the tube.
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Anything from 21 to 30 beads, depending on their orientation.
At the girdle, this stone would measure about 6.5 mm.
There are exactly 25.4 mm for each inch. Therefore, there are 16*25.4=406.4 mm in 16 inches. Assuming that 4 mm beads occupy exactly 4 mm along the length, this would allow 406.4/4=101.6 beads to occupy that length. In other words, you would have 101 beads but only 6/10=3/5 of a bead until you got to the 16 inch mark. Thus the answer is 101 whole beads with a little bit left over given the assumption about bead length.As a practical matter, the above calculation assumes that the beads are to occupy the entire "strand" and that the length given is not the entire length of the beading string itself, which would be longer in order to tie it. if the beads are actually a little shorter than 4mm or they don't have to be aligned along the length of the beading string exactly, you might be able to get 102 or more beads "along" the length.Read more: How_many_8mm_beads_in_16_inches
A round, brilliant cut diamond measuring 6.5 mm at the girdle weighs about one carat.
There are 10mm in one centimetre so 98 mm is 9.8 cm. 10 mm in one cm and 100cm in one meter. so mm goes into cm not the other way round.