Here is a mid century platinum emerald and diamond pendant. There is a deep dark green pear shaped cabochon emerald prong set with 3 round brilliant cut diamonds pavé set above it. There is an unusual webbed mesh design giving it a deco feel. 
I have had a difficult time deciphering what this piece originally was. I purchased it as you see it without the bail, which I recently added. 
 
Emerald:
Cut: Pear Shaped Cabochon
Weight: 1 = 0.30 cts 
Color: deep dark green
Clarity: eye clean
Measurements: 6.86 x 4.51 x 1.8 mm
 
Diamonds:
Cut: Round Brilliant
Weight: 3 = 0.04 cts
Color: G/H
Clarity: VS1/2
Measurements: 1.7 mm
 
Dimensions: 19.2 x 9.8 x 6.4 mm 
Metal: Platinum 
Markings: Pt 900 0.04ct
Circa: 1950-60
Condition Rating: 9 (like new, bail has been recently added)