MVAT (Maharashtra Value Added Tax) Rate: Typically 5% (under Maharashtra VAT) Synthetic stones usually fall under semi-precious or artificial stones category, which attracts 5% VAT. CST (Central Sales Tax) Rate: CST is generally 2% on inter-state sales if the seller has VAT registration. If not registered under VAT, CST may be charged at the standard rate of 10% (without concessional certificate).