I saw a lot of clear balls crack around here...
Well one thing for sure is the drilling process and the glue.
Superglue can damage the plastic (seen on other plastic balls) and the clear plastic is - from what I read and know - a bit harder and tends to crack easier.
A friends ROTOGRIP "Spare Tire" even cracked from the inside! Meaning the crack developed not on the surface but from the inside of the ball out to the fingerhole... never have seen anything similar..
The Clear Diamond sure is a neat piece of bowling "WOW" but imho I wouldn't dare to drill it... it is a ball to buy.. put into the cupboard... and look at it...
My XXXL also starts to crack around the ringfinger like your CCD (crystal clear diamond) it was hit by something sharp in the edge and cracked it was... plastic.
A possible solution would be to have the hole redrilled.. filled with clear filler.
Anyway keep and eye on it...
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"Have fun and bowl well!" - Grayson Check out my Vid in my profile.. just short clips cut together about how I bowled and how I play today
and by the way... I am a "Fritz" a "Jerry"... I am from Germany! (And please don't call me Kraut! Cause then I call you Dumbarse)