Valentine | Vintage Japanese 1.19ct Australian Dark Opal & Diamond Engagement Ring in Platinum, c.1990s

Valentine is a vintage Japanese platinum engagement ring centered by a 1.19-carat Australian dark opal with a distinctly romantic palette of red, orange, and magenta play-of-color. Against its misty N5 body tone, broad flashes of warm color appear and fade across the stone, joined by blue undertones and, in certain lighting, transitions from orange into yellow and green. The effect changes noticeably with the light. In softer indoor conditions, the color can take on an almost metallic glow across the dark body tone. Direct artificial light can occasionally soften the contrast, while sunlight brings Valentine to life most dramatically, locking the red and orange into their brightest, most vivid expression. Warm red and orange play-of-color is especially prized in dark opal, making this color profile considerably less common than the blue- and green-dominant material more often encountered. The opal’s play-of-color appears primarily in broad flashfire pattern, with larger directional sections illuminating independently as the ring moves. Natural color-bar boundaries divide some of these areas into visible segments; these internal borders are part of the stone’s natural structure and should not be mistaken for cracks or fissures. Its setting is equally distinctive. Four long tapered baguette diamonds create an angular framework around the oval opal, while ten round brilliant-cut diamonds complete a six-sided, almost hexagonal halo. Together, the 14 natural diamonds total approximately 0.34 carat and average VS clarity. The design is geometric without feeling severe, giving Valentine a refined late-20th-century Japanese character that bridges the Art Deco-influenced language of earlier Shōwa jewelry with the cleaner forms emerging in the 1990s. Crafted in solid Pt900 platinum, the ring weighs approximately 5.58 grams and measures about 12.67mm across the top. The inside of the shank is hallmarked “Pt900,” “.34,” and “1.19,” recording the platinum purity, total diamond weight, and opal weight. Valentine was sourced through one of OpalPop’s established Osaka-based estate-jewelry sources and was professionally cleaned, polished, and checked for stone security by our Anaheim jeweler. It remains in excellent vintage condition. For someone searching for a unique opal engagement ring rather than a conventional diamond solitaire, Valentine offers something unusually specific: warm red-orange play against a dark Australian opal, a geometric diamond frame, Japanese platinum craftsmanship, and a design that feels romantic without looking traditional. Because the opal sits relatively high in a prong setting, Valentine is best suited to mindful, occasional wear; we recommend removing it for exercise, housework, gardening, lifting, or other activities where the stone could be struck. Approximate default ring size: 5.25 US. More Information The Center Stone: Natural Dark Opal, solid carat weight: 1.19cts (inscribed in ring's shank) country of origin: Australia attributed mining locale: Mintabie brightness of color play: B3.5 of 5 body tone: N5 shape: oval cabochon cut stone measurements (millimeters): 8.55mm x 6.21mm stone measurements (inches): 0.33" x 0.25" play of color description: predominantly red/orange with magenta overtones and blue undertones; under certain lighting, orange morphs to yellow, then fades to green The Accent Stones: Diamond, natural stone count: 14 total carat weight: 0.34ct (inscribed in ring's shank) cut: Standard Round Brilliant Cuts (10); tapered baguettes (4) average clarity grade: VS1 average color grade: G-H-I The Setting: Japanese Contemporary High-Profile Prong-Set Ring with Geometric, Hexagonal Halo metal: .900 platinum, solid top of ring width: 12.67mm (0.5") ring height from finger: 9.26mm (0.33") bottom of shank width: 2.30mm ring weight: 5.58 grams approximate default ring size: 5.25 US