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

Connoisseurs Jewellery Cleaner 8 oz. …

White Gold Rhodium And 14k Gold Bonded Engagement Ring With Prong Set Princess Cut Clear Cz In Goldtone And Silvertone $32.00 Lead free alloy. Sizes 5-10. Imported – china. Prong. 5.2ct. 4g. 10mm x 10mm x 7mm……

White Gold Rhodium Bonded Engagement Ring With Channel Set Baguette Cz And Round Cut Clear Cz Center Stone In Silvertone $26.00 Lead free alloy. Sizes 5-10. Imported – china. Channel / prong. 4ct. 4.5g. 8mm x 8mm x 7mm……

J Goodin R08061R-C01-07 White Gold Rhodium Bonded Engagement Ring with Marquise Cut Centerstone and Shouldered Baguettes in Silvertone White Gold Rhodium Bonded Engagement Ring with Marquise Cut Centerstone and Shouldered Baguettes in Silvertone. Base Metal: Lead Free Alloy. Available Sizes: Sizes 5-10. Setting Type: Prong / Bar…

J Goodin R08089T-C01-05 White Gold Rhodium Bonded Engagement Ring with Round Cut Clear CZ in Goldtone White Gold Rhodium Bonded Engagement Ring with Round Cut Clear CZ in Goldtone. Base Metal: Lead Free Alloy. Available Sizes: Sizes 5-10. Setting Type: Prong / Bezel…

J Goodin R07577R-C01-07 White Gold Rhodium Bonded Clear CZ Engagement Ring in Silvertone White Gold Rhodium Bonded Clear CZ Engagement Ring in Silvertone. Base Metal: Lead Free Alloy. Available Sizes: Sizes 5-10. Setting Type: Bezel / Prong…

3 Diamond Wedding Band 3/4 ct. in 14K White Gold $1,629.00 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….

Sonic Wave CD-2800 Ultrasonic Jewelry & Eyeglass Cleaner (White/Gray)(package may vary) $21.99 Clean your fine jewelry, eyeglasses, dentures, electric shaver heads and many more household items with this Ultrasonic Cleaner. The stainless steel cleaning chamber has a 16-ounce capacity and uses ordinary tap water. Simply fill the tank with water and and get professional cleaning results. The quiet, solid state circuitry creates 42,000 ultrasonic energy waves per second, bringing your items to…

Ladies Beautiful 9 Stone Cubic Zirconia CZ Wedding Band Fashion Ring Set in 925 Sterling Silver Comes Gift Boxed $69.95 Beautiful Ladies Ring! More sterling at Ks Charming Designs!…