1.80 Pear Cut Sapphire Engagement Ring in 14K Yellow Gold1. 80 Pear Cut Sapphire Engagement Ring in 14K Yellow Gold. This engagement ring features a 1. 80 carat pear cut natural blue sapphire in 14k yellow gold. The sapphire is a deep, midnight blue stone with undertones of navy blue and denim. This dark sapphire showcases the wide spectrum of its brilliance in its variety of slim and wider facets of the oval cut. The natural blue sapphire is accented with two(2) . 05 carat genuine natural diamonds and set