This is such a pretty pendant. Set in 14K white gold, not hallmarked but acid tested. There are 8 round Diamonds, with a total weight of 0.80 ct. The center stone is a red Spinel. Fairly similar to Rubies, but cost is much less. As secondary gems go red Spinel in really good red color can be very valuable. Other Spinel colors have much less value. This Spinel is a deep rich red, with a hint of hot pink. The pendant measures 1/2". The red Spinel is a 1ct. stone. Weight of the pendant is 2.0grms. I would date this lovely pendant to 1930's-50's.