Vintage Platinum Blue Star Sapphire & Diamond Ring – 22.92 Carats, Circa 1935–1945

The sapphire displays a soft violetish-blue hue with semi-translucent clarity, allowing the star effect to remain visible and dynamic under a variety of lighting conditions. Fine natural star sapphires of this scale—approaching 23 carats—with a centered and clearly articulated star are increasingly scarce, particularly in original period mountings. 

Framing the center stone are ten diamonds totaling approximately 1.00 carat, set into bold, sculptural platinum shoulders. These diamonds appear to be primarily early full-cut stones, with several exhibiting transitional to old European-cut characteristics, including higher crowns and broader facet structures typical of pre- to mid-20th century cutting styles. Graded in the near-colorless range (H–I) with very high clarity (VVS2–VS1), they provide a lively brilliance that contrasts beautifully with the velvety glow of the sapphire.

The mounting itself is substantial and expertly constructed, with a flared shank, raised shoulders, and an open gallery beneath the sapphire—hallmarks of hand-fabricated platinum work from the late Art Deco to early Retro period. The ring has been tested as platinum and, while unmarked, is consistent with approximately 900 fineness, a standard alloy used in fine jewelry of this era. 

Based on its design, craftsmanship, and diamond cutting style, the ring is best dated to circa 1935–1945. According to the consignor, it has been passed down through multiple generations, further supporting its mid-20th century origin. 

An independent insurance appraisal completed in November 2021 assigned a replacement value of $9,900. 

With its impressive scale, rare natural phenomenon, and strong period design, this ring stands as a distinctive and enduring statement piece—equally suited for collectors of vintage jewelry or those seeking a one-of-a-kind signature ring.

Specifications: 

Metal: Platinum (tested; likely ~900 fineness) 

Center Stone: Natural Star Sapphire 

Weight: 22.92 carats (estimated) 

Dimensions: 14.62 – 14.33 x 10.21 mm 

Phenomenon: Six-ray star (asterism), well-centered 

Color: Violetish-blue 

Clarity: Semi-translucent 

Diamonds: 10 total 

Total Weight: ~1.00 carat 

Cut: Early full-cut with transitional/old European characteristics 

Color: H–I 

Clarity: VVS2–VS1 

Ring Size: 5 

Weight: 14.1 grams (including stones) 

Period: Circa 1935–1945.

Face Height: 14.73mm

Rise Over Finger: 6.08mm

Band Width: 4.44mm tapering to 3.07mm

• Designer = Appraisal Included
• Material = Platinum
• Metal Finish = Warm Patina
• Gemstone = Star Sapphire
• Shape/Cut = Round Cabochon
• Gem Color = Violetish Blue
• 2nd Gemstone = Diamond
• 2nd Shape/Cut = Early-Full Cuts
• 2nd Gem Color = H-I
• 2nd Gem Clarity = VVS2-VS1
• Weight (Grams) = 14.1G
• Ring Size = Size 5
• Condition = Very Good Condition

Note: This item has been inspected and appraised by a GIA Graduate Gemologist Appraiser.

Diamond origin is tested using a GIA iD100 Gem Testing Device. Unless indicated otherwise, all diamonds are to be considered natural, earth-mined diamonds. All man-made, laboratory-grown, laboratory-created, or synthetic diamonds are well marked on the price tag as well as in the website description.

All diamond and gemstone grading is done under GIA standards as the mounting permits. All gemstone weights and measurements are approximate. Unless otherwise stated, colored gemstones may have commonly used clarity and color enhancing treatments per industry standards.

Prospective buyers should note that all jewelry we sell is 'used' and will likely have some amount of wear, we warranty that the item will be essentially as we have described it, but no other warranties are expressed or implied, and all items are sold 'as is'.