Are all the gold rings stamped / marked with "K" on the inside?

I just bought an engagement ring establishment of a reputable jeweler in the mall. It was a lonely place and costs $ 450. (No diamond) I guess it was 14 carat gold, but when I got home, I realized around the inside said it was "us." Is it possible to be 14k gold and not be marked?

themselves and 18K PG

14k White Gold Diamond Set Engagement Ring Jewelry

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Connoisseurs Jewellery Cleaner 8 oz. …

3 Diamond Wedding Band 3/4 ct. in 14K White Gold $1,730.00 There is but one piece of jewelry that so elegantly reflects on the past, celebrates the present and embraces the future. The Three Diamond Anniversary Band. Three beautiful diamonds set side by side. One for your past, one for the present and one for the future….

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Photo Jigsaw Puzzle of Diamond rings in the Gold Souk from Robert Harding Photo Puzzle, Diamond rings in the Gold Souk. Diamond rings in the Gold Souk, Deira, Dubai, United Arab Emirates, Middle East. Chosen by Robert Harding. 10×14 Photo Puzzle with 252 pieces. Packed in black cardboard box of dimensions 5 5/8 x 7 5/8 x 1 1/5. Puzzle image 5×7 affixed to box top. Puzzle pieces printed on RA4 paper at 300 dpi. This item is shipped from our American lab….

Sterling Silver High Quality Shimmering 2 Karat Round Brilliant Cubic Zirconia Couple Ring size 8 (Free GIFTBOX+SHIP) $34.99 This Sterling Silver High Quality Shimmering 2 Karat Cubic Zirconia Prong Set Couple Ring size 8 comes with free gift box. This ring is made out of solid Sterling Silver (0.925) about 6.5 gram weight. Stones: 2 Karat Round Brilliant Cubic Zirconia in center and Total 4.3 Karat Cubic Zirconia. Color: D-F Clarity.Cubic Zirconia Stones on ring are not glued in like most silver jewelry but are set by…

Sterling Silver High Quality Shimmering 2 Karat Round Brilliant Cubic Zirconia Couple Ring size 7 (Free GIFTBOX+SHIP) $34.99 This Sterling Silver High Quality Shimmering 2 Karat Cubic Zirconia Prong Set Couple Ring size 7 comes with free gift box. This ring is made out of solid Sterling Silver (0.925) about 6.5 gram weight. Stones: 2 Karat Round Brilliant Cubic Zirconia in center and Total 4.3 Karat Cubic Zirconia. Color: D-F Clarity.Cubic Zirconia Stones on ring are not glued in like most silver jewelry but are set by…