For a beach or outdoor wedding, it is better to choose a necklace which is made from gold material as it does not get tarnished easily in a humid or salty environment. A minimalist and lightweight design, for instance a dainty pendant, would complement the laid-back atmosphere perfectly. Make sure that the necklace is comfortable to wear for the whole day and has a strong clasp so that it does not get loose. Also, the wedding theme can be taken into consideration, for instance, natural items such as leaves will look great at a beach wedding as they will give the wedding a touch of elegance while staying in harmony with the surroundings.