Short answer: No. Haldi (turmeric) functions are not part of Jain Diksha.

What is Diksha in Jainism: Diksha is the initiation into renunciation, where a person adopts the vows and disciplines of a monk or nun (the exact practices can vary a bit between Digambar and Śvētāmbara communities). It involves taking formal vows, renunciation of household life, and adopting the ethical and daily practices of a Jain ascetic. A turmeric ceremony is not a canonical part of this rite in Jain sources; turmeric is more commonly seen in Hindu marriage or other regional customs.

If you’d like, I can explain the key steps or vows involved in Jain Diksha (and how they differ between Digambar and Śvētāmbara traditions) in simple terms.