Many thanks Frank. There is a bit of confusion. Please see in link below an old RJWMB post from Arthur who had used information published by Vincent Meylan who quoted from Lord Twining to produce a list of jewels designated by Queen Victoria as "Heirlooms of the Crown". Item number 7 is "154 unmounted collet diamonds". We assume these were the remains of the dismantled Queen Adelaide diamond collet necklace.
Number 6 doesn't state three but only two "brilliant necklaces made of 32 and 45 collet diamonds". It was assumed that the 32 collet diamond necklace was a longer form of today's coronation diamond necklace. Arthur's list seems to be missing a necklace of 42 diamond collets.

https://members2.boardhost.com/royal-jewels/msg/archive/1405776855.html