1. Molybdenum Content – 316L contains 2–3% molybdenum, which 304 does not. This makes it significantly more resistant to corrosion, especially in saltwater, sweat, and harsh environments.
    
2.  Superior Corrosion Resistance – 316L is more resistant to pitting and rust caused by chlorides (like seawater and cleaning chemicals). 304 is more prone to tarnish and corrosion over time.
    
3.  Better for Sensitive Skin – 316L has a lower carbon content (“L” = low carbon), making it gentler and hypoallergenic compared to 304, which can sometimes cause irritation.
    
4.  Longevity & Durability – Jewellery made from 316L lasts longer, keeping its shine and structural integrity, whereas 304 may dull, pit, or corrode faster.
    
5.  Higher-Grade Standard – 316L is considered a “surgical grade” stainless steel, trusted for medical implants and body jewellery, while 304 is more of a general-use kitchen/industrial grade.
    
6.  Premium Look & Value – Because of its strength, resistance, and safety, 316L is the preferred choice for luxury and waterproof jewellery brands, while 304 is often used in cheaper alternatives.
    

👉 In short: 304 is fine for cutlery and kitchen sinks, but 316L is made for skin contact, saltwater, and everyday wear — making it the superior choice for jewellery.