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Gorgeous antique platinum ring from the Roaring 20s!

Metal(s) Used: Platinum
Hallmarks: PLATINUM
Weight (total): 3.2g
Rise: 5.54mm
Band(s): 8.33mm to 1.54mm
Ring Size (approx): 7.5
Resizable? Yes, within reason
Setting Condition: Very Good. Light normal wear for a ring of its age and type, prongs have been re-tipped in white gold.

Stone: Diamond (tested)
Shape: Round Old Mine Cut
Diameter: 4.47mm
Estimated Carat Weight: .33
Estimated Clarity: SI1 or better! (I saw no inclusions under the loupe, but I don't grade diamonds myself above SI1)
Estimated Color: I
Main Stone Condition: Excellent, no damage or wear

Time Period: Late 19 teens to early 1920s.
Country of Origin: USA
Purpose: Engagement Solitaire

Free EMS insured shipping, US only, Confirmed addresses only, please.

Seriously interested? You'll want to read everything here:

Don't forget to visit my shop to see more Auld Baubles! :-D

Frequently asked questions about AuldBaubles

Vintage/Antique baby/children's jewelry almost certainly does not meet metals safety standards for youngsters of today. Therefore I can only sell it for adult use.

I cannot guarantee sterility of earring posts/hooks/wires (and/or other pieces where this may be an issue). Please purchase and use at your own risk.

May try to sell you work your ring doesn't need! Be on your guard, refer to Item Details for info re: prongs and bands.

Colors may display inaccurately on screens.
RING SIZES are approximate, due to jewelers' ring sizing mandrels not being completely standardized.

STONE SIZES are necessarily estimates, because in most cases, I cannot measure the depth of a stone due to its being in a setting. I measure the diameter (or length and width) of a stone with digital calipers, and estimate its carat weight from its span.

BANGLE SIZE: Please note the inner diameter for the bangle. I suggest you cut out a mock-up on sturdy cardboard to see how it will fit you before ordering.
The outer packaging is discreet, nobody will know there is jewelry inside.

I do not use my shop name on the return address; this is for the item's safety in transit and for privacy on arrival, as jewelry items are often bought as gifts.

Pieces are sent in small carton boxes tied with rustic string, or cushioned inside handmade wrapping paper gift bags.

Antique Engagement Ring: Old Mine Cut Diamond, Platinum Filigree


  • Vintage item from the 1920s
  • Materials: Platinum, Diamond
  • Only ships within United States.
  • Feedback: 371 reviews
  • Favorited by: 139 people