Gold-tone ring with carved blue stone terminals

This piece features a yellow metal band with a bypass or crossover design, terminating in two distinct, carved fluted or melon-cut deep blue stones that appear consistent with lapis lazuli. The metal exhibits a warm, polished yellow finish with ribbed or fluted structural elements leading up to the main stone. There are faint stamped markings visible on the inner band, including numbers that appear to read '18k' along with other partially legible characters, which are consistent with gold fineness hallmarks but remain unverified without physical testing and close-up inspection. The item shows minor surface wear and patina appropriate for a pre-owned piece of estate jewelry. The overall craftsmanship suggests a mid-20th-century or later aesthetic, styled in the manner of high-end designer bypass cocktail rings. Please note that the owner supplies an attribution claiming this is an 18k gold Tiffany ring with lapis lazuli; however, this user-supplied claim is entirely unverified and cannot be treated as a definitive fact based solely on photographic evidence. Hedged language is used in the item name because designer attribution and precious metal purity cannot be fully authenticated without hands-on expert evaluation, physical testing, and examination of maker's marks under magnification.

Based on the visual evidence provided, I have evaluated this gold-tone bypass ring featuring carved deep blue stone terminals. Per user submission, the owner identifies this as an 18k gold Tiffany ring with lapis lazuli. Based on what I can see in the photograph, the piece displays a polished yellow metal finish with ribbed structural elements and a crossover design terminating in carved melon-cut blue stones. I can't verify from a photo whether the metal is solid 18k gold, nor can I confirm the exact mineral composition of the stones or the legitimacy of the faint '18k' stamp and potential maker's marks, as these details would need physical inspection and magnification to confirm. My appraisal value estimate of $3,500 to $5,000 assumes that the owner's attribution is correct and that the piece is an authentic creation by the stated maker utilizing 18k gold and genuine lapis lazuli. Mid-century designer bypass cocktail rings of high quality generally attract steady collector demand in the secondary market, influencing this estimated range. However, if the item turns out to be a reproduction, replica, copy, or merely made 'in the style of' the attributed maker, or if the metal is found to be of lower purity, the market value would drop significantly, likely falling into the $400 to $800 range for a standard unmarked estate piece of similar materials. To confirm authenticity and establish a definitive valuation, I would recommend an in-person physical examination, hallmark verification, gemological testing to identify the stones, and potential consultation with a luxury jewelry specialist or review of provenance documentation.