First I must say that this ring is gorgeous! It is a large natural blue star sapphire surrounded by a halo of moissanite gemstones. The large 11mm x 9mm oval star sapphire is a full 5.50 carat sapphire. There is a halo of 12 nice sized pear-shaped moissanite stones each approximately 4mm x 3mm encircling the star sapphire. The ring is a full 20mm x 18.7mm across the top - not too small or large! It is stamped 925 and signed and is plated with platinum to prevent tarnish. This mesmerizing ring is the embodiment of sheer elegance and radiates an unparalleled aura of luxury. (Pictures were taken under the sunlight.)