Among Jains, there is no religiously‑required “mangalsutra” mentioned in the Jain Agams or main scriptures.

1. What is mangalsutra for Jains?

• The black‑bead necklace called mangalsutra is mainly a Hindu cultural custom, not a specifically Jain one.
• Many Jain families, especially in India, follow local social customs during marriage.

So in some regions: - The groom ties a mangalsutra, - In other regions, there may be a different symbol (ring, sari, etc.), - And in some Jain families, no mangalsutra is used at all.

2. Jain religious view

• Jain Dharma focuses on:

- Samyak Darshan, Samyak Gyaan, Samyak Charitra (right faith, knowledge, conduct), - Vows (vrat), non‑violence, aparigraha (non‑possessiveness).

• Outer symbols like a mangalsutra are not necessary for liberation according to Jain philosophy.
• Marriage in Jainism is more about:

- Following dharma together, - Avoiding himsa, falsehood, addictions, etc., - Supporting each other in spiritual progress.

3. Between Digambar and Shwetambar

• Scripturally, neither Digambar nor Shwetambar texts make mangalsutra compulsory.
• Differences, if any, are more social and regional, not doctrinal.
• Both traditions agree that inner character and vows are more important than jewelry.

4. Practical understanding

• If a Jain woman wears a mangalsutra, it is usually:

- For family or social reasons, not as a strict religious rule.

• If she doesn’t wear it, from a Jain dharmic point of view, there is no sin in that.

So: Yes, some Jains do follow the mangalsutra custom, but it is cultural, not a Jain religious requirement.