Made in Japan. K18 product. This is an oval-cut pendant top featuring a rare Montana green sapphire with a mystical blue-green glow. Montana green sapphire is a special natural stone mined in Montana, USA. Its color is a beautiful mix of blue and green, possessing a profound beauty that resembles a work of art created by nature. The delicate sparkle that changes with the angle of light further enhances the individuality and charm of this stone. Stamped with K18. Stone size: Approximately 4 x 5mm Material: K18 yellow gold, Montana green sapphire 0.45ct Bail inner dimensions: Approximately 3mm wide, 5mm long