I received this as a gift, but I'm selling it at a reduced price because I purchased a different single-stone earring. The sky blue topaz used is 0.60ct, and the single stone is about 5mm in size, featuring a vibrant blue color. It's a single-stone type with vertical prongs, so the color makes it suitable for any occasion, from business to outings and parties, with a beautiful sparkle. The pin and catch are made of Pt900 (Platinum 900). The catch is a type with platinum attached to a silicone that is difficult to remove. With a guarantee. - Stone: Sky Blue Topaz - Carat: 0.60ct - Size: Approximately 5mm per stone - Material: Pt900 - Engraving: Pt900 0.30 on both sides - Catch: Pt900 + Silicone - Additional Information: Natural stone Color: Blue Earring Shape: Catch/Stud