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Art Deco Platinum 3.13 CTW Diamond, Sapphire and Black Onyx Converter Brooch

Item Details

Style: Art Deco
Material: Platinum with 14K Closures
Brooch Closure Type: Locking C-Clasp
Hallmarks: Unmarked
Total Weight: 8.50 grams

Type: Sapphire
Shape: Modified Kite Faceted
Count: 1
Dimension: 9.20 mm x 5.10 mm x 3.20 mm

Type: Diamond
Shape: Old European Cut, Single Cut, Rose Cut
Count: 86
Dimension: 0.60 mm – 4.10 mm
Carat Weight: 3.13 ctw
Color Grade: H – I
Clarity Grade: VS2 – I1

Type: Black Onyx
Shape: Modified Square Cabochon
Count: 25
Dimension: 2.00 mm x 1.00 mm – average

  • This item has been evaluated and verified by a GIA Graduate Gemologist.
  • All diamond and gemstone grading is done under GIA standards as the mounting permits, where gemstones are present; where mountings impede accurate measurements, (estimated) dimensions are provided. All weights and measurements are estimated and approximate. Industry standard and accepted treatments for gemstones are assumed unless otherwise noted.
  • Pre-owned jewelry may contain minor markings/imperfections throughout.
  • While we represent items accurately on our site to the best of our ability, the color calibration of computer monitors can vary, causing colors to appear slightly different from one monitor to another. Due to this, please note that precise color representation of metal and gemstones is not always possible.


- one black onyx is missing.
- some black onyx is heavily worn.
- black onyx is chipped and abraded.
- diamonds have minor chips and abrasions.
- visible solder.
- figure eight safety is bent.
- all closures are 14K.
- missing and broken stones.

Item #


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