Mare Nubium Sapphire engagement ring

18k gold and golden sapphire - one of a kind

Long ago it was believed that there were beautiful seas and lakes of water on the moon that were visible from Earth.  Galileo looked through his telescope and named them all. This ring is named after one of those lakes, the Mare Nubuim.

A bold and classic style with an ancient silhouette, created here with gorgeous golden sapphire and burnt orange diamonds, and cast in solid 18k recycled yellow gold.

The subtle flare and sculpted style on the ring shank refers to an old European style of ring that is comfortable to wear, and nests perfectly with the Midheaven collection.


◖ Featuring a 1.59ct oval cut golden sapphire, held securely with a modified bezel design

◖ This sapphire was hand selected specifically for it's golden hue and brilliance.

◖  Set with 0.28cts of brilliant cut round burnt orange diamond pave down the side of the band.

◖This is a one of a kind piece that can be resized.  This ring is a US size 6 and can ship out within 2 business days. If you would like a different size please contact us for more information, to request modifications, or pricing for other gold alloys or platinum.


    At 12th HOUSE we offer a Custom fit + sizing service, where we work with you personally after purchase on making sure your new piece fits just right.

    ◖Our process is simple◗

    We will confirm your exact size before making the ring just for you. After confirming your exact size with our sizing kit, we will craft your custom-made ring using solid 14k or 18k recycled gold in our studio.

    + please contact us for more information or to request modifications, or pricing for other gold alloys or platinum.

    the perfect fit for you