Our Constance necklace comes in your choice of 925 Sterling Silver or 14k Gold Plated. Our superior quality gold plating is 1 micron thick - that's double the standard 0.5 thickness for gold plated jewelry! The 20" chain is dainty but strong and can be adjusted to 18". This versatility works on practically everyone, but if you need a different length, reach out to us - we can help!