Vintage Silver Gemini Constellation Zodiac Sign Pendant with Zircon Stones

Here is a vintage silver Gemini zodiac sign pendant that has both the zircon stones constellation and the Gemini sign. I'm calling the stones Zircon but I think they may be diamonds because they are open in the back for the stones to breath, and that is the way they mount diamonds. The charms and the chain are silver. It cleaned up well when I put it in my silver cleaner. It has a "c" spring fastener. I have never worn it, because its not my sign. I kept it because I love silver and in my collecting over the 30 years I kept everything that was silver! The chain has an 8 3/4" hang. The constellation pendant is 3/4" by 1/2". It is signed on the back " China" with the zodiac sign below that. See pic. I can't find this necklace anywhere,