Hallmarked yellow gold ring with a large cushion-shaped tourmaline, designed as a refined vintage-style gemstone ring with a strong architectural profile and a prominent faceted center stone. The ring is set with a 3.39 ct tourmaline displaying a deep dark green to green-brown appearance, with reflective facets that show lighter olive, brownish-green, and smoky tones under direct light. The gemstone has a rounded cushion outline and is mounted in a substantial gold setting with a smooth bezel-style frame, giving the ring a solid, elegant, and distinctly vintage character. The ring has a total weight of 3.8 g and an inner diameter of 20 mm. Based on the inner diameter, the approximate inner circumference is 62.83 mm, calculated as 20 × π = 62.83 mm. This corresponds approximately to EU ring size 63, depending on exact fit, ring width, and sizing standard. The ring has a wearable and balanced construction, with enough gold presence to feel substantial while remaining lighter than larger wide-band signet rings. The design features a polished yellow gold band with shaped shoulders that rise toward the central gemstone setting. The shoulders have decorative stepped and engraved details, giving the ring a refined vintage appearance rather than a plain solitaire style. The central tourmaline is positioned prominently at the front, framed by gold and held securely within a low-profile setting. This gives the piece a practical and elegant profile suitable for regular wear, formal use, collector display, or resale inventory. The 3.39 ct tourmaline forms the focal point of the ring. Its dark, moody color gives the piece depth and character, while the cushion shape softens the overall geometry of the design. Tourmaline is appreciated for its broad variety of natural colors, and darker green or brownish-green tourmalines are especially effective in yellow gold settings because the warm gold tone enhances the gemstone’s earthy depth. The result is a classic gemstone ring with a strong antique-inspired expression, suitable as a men’s gemstone ring, unisex gold ring, vintage cocktail ring, collector’s tourmaline ring, or fine jewelry statement piece. The visible hallmarks inside the band add further collector interest and indicate a properly marked gold ring. The ring’s combination of polished gold, decorative shoulders, and a large cushion-shaped gemstone gives it strong appeal for buyers searching for vintage gold jewelry, hallmarked gold rings, natural gemstone rings, colored stone jewelry, and antique-style tourmaline rings. The ring has a strong visual identity, with a central gemstone that appears dark and understated from some angles while revealing brighter internal reflections in direct light. This piece is especially relevant for buyers looking for a yellow gold tourmaline ring, cushion cut tourmaline ring, dark green tourmaline ring, green-brown tourmaline ring, vintage gemstone ring, men’s gold gemstone ring, unisex statement ring, hallmarked gold ring, estate jewelry ring, gold cocktail ring, natural tourmaline jewelry, gold ring with green gemstone, gold ring with brownish-green stone, and collectible colored gemstone jewelry. The cushion-shaped tourmaline and classic gold mounting make the ring suitable for those who prefer distinctive gemstones rather than conventional diamond-centered jewelry. The 20 mm inner diameter and approximate 62.83 mm inner circumference make the ring a practical larger size, while the 3.8 g total weight gives it a comfortable balance between presence and wearability. The low-set cushion gemstone and shaped shoulders make the ring more compact than high-profile cocktail rings, while still offering a strong visual impact. The piece is suitable for collectors of vintage gold rings, buyers of natural tourmaline jewelry, gold dealers, gemstone enthusiasts, and anyone looking for a distinctive ring with character and documented measurements. A vintage-style hallmarked yellow gold tourmaline ring set with a 3.39 ct cushion-shaped dark tourmaline, total weight 3.8 g, inner diameter 20 mm, and approximate inner circumference 62.83 mm. A suitable piece for fine jewelry collectors, vintage jewelry buyers, gemstone dealers, gold ring collectors, and buyers seeking a distinctive natural gemstone ring with a classic gold setting. 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