Platinum 850 Oval Ruby Diamond necklace. One oval cut Ruby, 0.4ct halo with round brilliant diamond, 0.25ct, G-H color and Si1-Si2 clarity. Pendant is 16.0 c 8.7mm, hallmark 0.4, 0.25, PT900. The ruby has certificate with number CS319337. 17" Platinum 850 necklace. 3.6 gram.