1.26ct Oval Green Untreated Montana Sapphire Signet Style Ring with Di 7" Ombre Shade Montana Sapphire Station Bracelet Double Strand 14K Gold Athena Ring 1.74ct Light Green Montana Sapphire, 14k Yellow Gold (One Athena Ring 1.74ct Light Green Montana Sapphire, 14k Yellow Gold (One. graduated round faceted Montana sapphires in green ombre tones band is round and measures 1. 5mm wide available in solid 14k yellow, white or rose gold made to order, ships within 3 4 weeks of purchase September birthstone The Artemis Chevron ring features ethically mined sapphires from Montana. Each stone is hand selected to create a subtle ombre effect, so please expect slight variation in the gemstones used to create your ring.