This pin is an exciting find. It measures 12.35mm by 12.85mm long. It features a 3mm or approx. 10 point Old European cut diamond with small open culet. The diamond is stunningly white and clear. The small rectangular sapphire below it is a lovely blue. It is likely synthetic, as was most common in that period. The entire piece weighs 1.35 grams.
It is tested and stamped 18kt on back of pin just below diamond.
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All That Glitters......