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Diamond and Platinum Brooch

An Art Deco open work platinum brooch measuring 1 ¾” x 1” with an illegible maker’s mark. The brooch has a unique pattern created by the diamond placement, size and blue sapphire accents. There are three bezel set Old Mine Cut round diamonds. The center diamond weighs 0.85 carats and the sides are 0.90 carats each. The diamonds are measured using the industry formula for measuring set stones. All the diamonds including the smaller sizes are H –I color and VS2 – SI1 clarity.

There are twelve caliber cut blue sapphires, in four sections of three, each having graduated sapphires with the largest stone on the outside and narrowing down to the smallest. One of the smallest size sapphires is missing. Two sections meet on each side of the center and create an outward facing half-moon. There is a blue sapphire baguette going north to south mirrored on each side of 0.90 carat diamonds.

The piece is all about symmetry, the two halves making the whole. A “half” consists of a section of three round diamonds, set individually creating a trefoil. The next part has a vertical row of three smaller size diamonds, the baguette and three more same size diamonds. The last part is the main body with eight medium diamonds and thirty two smaller. The total diamond count minus the three large ones is fifty eight equaling approximately 1.00 carats. The total diamond weight is approximately 3.65 carats.