This is a high quality classic 14k yellow gold women's tube-style crucifix necklace, from Apples of Gold Jewelry.
The crucifix pendant measures 1" tall (or 1 1/4" tall with hoop/bale) x 11/16" wide.
Also available in larger versions for women and men, shown below.
Weighs approx. 1.28 grams of 14k gold.
"O give thanks unto the Lord; for he is good: for his mercy endureth for ever" (Psalm 136:1).