If you love colorful jewelry you are going to love this beautiful little necklace! It has an 8x6 mm (1.6 ct) oval cut, Neptune (also called Cassiopeia) topaz. A Cassiopeia or Neptune is a natural topaz that has been coated in a vapor disposition process. This makes the topaz very colorful. This one is primarily blue with flashes of green and yellow. In addition to the topaz, there is also .03 ctw of diamonds. The topaz and the diamonds are all genuine, natural gemstones (only the topaz has been treated). The setting is solid 10k white gold. The pendant measures 17 mm (5/8 inch) long and comes on an 18 inch long pendant chain with a round spring clasp, also made of solid 10k white gold. Pendant and chain weigh 1.4 grams together.