Yellow gold over .925 sterling silver Labradorite & Ethiopian Opal & White Topaz gemstones = approximately 68.58 ct. tw. Approximately 18in long Lobster claw clasp The Necklace Size Guide(https://more-info.s3.amazonaws.com/guides/SizeGuideNecklaces.jpg) It is customary to treat most gemstones to achieve enhanced color and durability. Some of these treatments may not be permanent, and may require special care. Please note: In product titles ct. tw. refers to the total carat weight of all diamonds and/or gemstones combined.