From our personal experience, we have seen that most of the clean and matured beads get thin cracks after few days of storage. And sometimes it actually gets bigger cracks too. I can point out that wearing the beads with small cracks are fine as that comes automatically.
And we have understanding that, the beads will be good if kept with oil. Yes that is true to some extent. Say we keep some beads in oil for 2 days and then take them out and store it. Now there is no guarantee that the beads won't get cracks now. It will still get cracks. The difference is - After putting in oil, the cracks that come are more thinner. But it always comes.
The higher mukhi beads like 8 mukhi, 7 mukhi, 9 mukhi, 10 mukhi, 11 mukhi, 12 mukhi , 14 mukhi and so like also get cracks. And it is completely safe to wear these with small crack lines.
When we wear the beads continuously, there is lesser chance that the beads will get cracks early. Actually as the beads are worn so they are actually being used and do not get cracks early. But if the beads are really big/matured then definitely there will be slight cracks although it will not be visible because that will have some deposits.
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