This is a gold K18 plated tennis necklace made of stainless steel. It is 50cm long and 3mm wide. I believe the stones are zirconia. I purchased this assuming it was surgical stainless steel, but it reacts to a magnet. Surgical stainless steel should have a 316 or 316L marking, but this has a stainless steel marking, so I believe it's likely SUS304 or SUS340. Although it's not surgical stainless steel, it has a stainless steel marking, so it's very resistant to rust and scratches, and it's unlikely to cause allergies. I recommend it. If you're hesitant to buy an expensive tennis necklace right away and are worried about allergies or making a mistake, I recommend trying this one. No box included. Please understand that returns and cancellations after purchase are absolutely not accepted unless there is a defect. Please purchase with this in mind. Please refrain from purchasing if you are a detail-oriented person or tend to make a lot of comments. #TennisNecklace #TennisChain #TennisNecklaceChain #GoldTennisNecklace #GoldTennisChain #StainlessTennisChain #StainlessTennisNecklace #K18PlatedTennisNecklace #K18PlatedTennisChain #StainlessNecklace #SurgicalStainlessNecklace #AllergyFriendlyNecklace