Which mukhī rudrākṣa should I wear?
the five-mukhī is the most common and is traditionally considered suitable for everyone; rarer mukhīs are a matter of belief and guidance.
A rudrākṣa is the dried seed of the Elaeocarpus tree, and its mukhīs are the natural lines running from top to bottom. The Śiva Purāṇa and the Rudrākṣa Jābāla Upaniṣad praise it as sacred to Śiva and describe different mukhīs with different presiding deities. The five-mukhī, linked with Śiva as Kālāgni Rudra, is by far the most available and is worn by householders, children and sādhus alike.
Other mukhīs — one, two, six (often for students), eleven, Gaurī-Śaṅkara and so on — are believed in tradition to carry particular blessings. These are beliefs, not guaranteed effects, and rare beads are often faked or sold at inflated prices. Buy from a trustworthy source and avoid anyone who promises results.
If you are unsure, a five-mukhī bead or mālā worn with daily remembrance of Śiva is a complete and honest choice.
If your situation is specific, Ask Chiluka.
Source: Śiva Purāṇa; Rudrākṣa Jābāla Upaniṣad · Five-mukhī: most common, for all
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