Most of the necklaces and bracelets can be altered. When it is not possible, I mentioned that in the description of the item. Please, contact me if you want to alter the necklace via the contact form so that you get the right size of the necklace you want. If you tell me to alter the necklace/bracelet before I send the items to you, the alteration is free of charge. If you send me the necklace back to alter it, you have to pay the extra shipping costs.
Have a look at the ‘free information’ page. You will find a little instruction video there if you want a necklace or bracelet altered. You will also see can see how to measure the right way.