A genuine 2.25mm "AA" rated blue sapphire gemstone is set in a pure 14k yellow gold polished women's cross ring, from Apples of Gold Jewelry.
The band of the women's cross ring measures 2.8mm wide and 2mm thick with a top/face measurement of 5/16" (8mm).
You can also upgrade to 18k gold or the ring is also available in white gold (shown below), as well as varying gemstones.
Sapphire gemstones are often pictured in the Bible in relation to God's glory or His throne room in heaven, as well as the streets of the new heavenly Jerusalem, the city of God. "And the foundations of the wall of the city were garnished with all manner of precious stones. The first foundation was jasper; the second, sapphire; the third, a chalcedony; the fourth, an emerald;" (Revelation 21:19).