Victoria is a mid-century Japanese platinum engagement ring centered by a natural Australian light opal and surrounded by a complete halo of eighteen round brilliant-cut diamonds. Measuring approximately 13.23 × 9.30mm, the opal has enough scale to command the center of the ring while the estimated 0.45 carat diamond halo frames it with a softer, shimmering brilliance rather than overwhelming it.
Its N7 light body tone carries an unusual mauve-gray cast, giving the opal a subtly purplish character that feels especially at home in its mid-century setting. Its play-of-color is soft, iridescent, and almost powdery in character, with green pooling most prominently through the center. Indoors and in lower light, the stone tends to read predominantly green with a narrow orange-yellow glow along one edge. In brighter light and sunlight, those warmer colors become more active, while blue undertones emerge more clearly across the semi-crystal body.
Much like the surface of a butterfly’s wing, the color shifts gently rather than flashing aggressively. The play-of-color appears primarily in a relatively shallow layer just beneath the opal’s softly domed surface, creating a flatter, shimmering effect rather than deep internal color. That delicacy is part of what gives Victoria its old-world charm.
The setting contributes just as much to that character. A continuous diamond halo surrounds the opal in a rounded, traditional silhouette, while the gallery beneath is finished with scrolling openwork and filigree-like details typical of Japanese platinum jewelry from the mid-20th century. The sides of the shank retain a period textured finish bordered by polished platinum, giving the ring additional visual interest without competing with the center stone.
The inside of the shank is hallmarked “P.M900,” a Japanese platinum mark consistent with the ring’s c.1950s dating and pre-mid-1960s construction. Victoria was sourced through one of OpalPop’s established Tokyo estate-jewelry sources and was subsequently cleaned, the polished platinum surfaces refreshed, and the opal checked and tightened by our Anaheim jeweler. The stone is Australian and is attributed, though undocumented, to the Mintabie mining region.
A small chip is present along the lower edge of the opal beneath one prong, likely acquired during its prior life. It is not visible face-up and is most apparent from the side; a dedicated close-up is included in the image gallery. Because opal is softer and more impact-sensitive than diamond, and because Victoria is an authentic vintage piece, we recommend mindful, occasional wear rather than treating it as an everyday no-precautions ring.
For someone searching for a vintage heirloom opal engagement ring, Victoria offers something modern reproductions cannot recreate: genuine mid-century age, Japanese Shōwa-era platinum workmanship, an old-fashioned diamond halo, and the quiet history of a ring that has already lived a life before beginning another. It is equally compelling as a self-chosen vintage jewel for the woman drawn to its soft color, period craftsmanship, and unmistakably mid-century character.
Approximate default ring size: 6.50 US.
More Information
The Center Stone: Natural Light Semi-Crystal Opal, solid
- country of origin: Australia
- attributed mining locale: Mintabie
- brightness of color play: B3 of 5
- body tone: N7
- shape: oval cabochon cut
- stone measurements (millimeters): 13.23mm x 9.30mm
- stone measurements (inches): 0.5" x 0.33"
- play of color description: predominantly green/orange with yellow/blue overtones
- additional notes: an eye-visible chip exists along the bottom edge of the stone; not visible from top-down, most apparent from side view and gallery
The Accent Stones: Diamond, natural
- stone count: 18
- total estimated carat weight: 0.45ct
- cut: Standard Round Brilliant Cuts
- average clarity grade: SI1
- average color grade: H-I-J
The Setting: Prong-Set Halo Ring with Textured Shank
- metal: .900 platinum, solid
- top of ring width: 16.47mm (0.66")
- ring height from finger: 8.73mm (0.33")
- bottom of shank width: 1.48mm
- ring weight: 5.20 grams
- default ring size: 6.50 US
