This necklace is made of genuine Fire Opal Swarovski Crystals. Fire Opal is unique in that the colors Yellow and Orange are blended creating very beautiful crystals. They are accented with Clear crystal rondelles that sparkle like diamonds. The pendant drop is apx. 1-1/4". All silver used is .925 Sterling Silver. The clasp is an easy-to-use lobster clasp with an extender that allows you to adjust the length from 16" to 18". Email me for other lengths.