SILVER NECKLACE AND GEMSTONES

CAN ANYONE PLEASE TELL ME WHO MADE THIS NECKLACE, ITS AGE AND ROUGHLY ITS CURRENT VALUE? IT IS MADE OF SILVER AND HAD 5 BEAUTIFUL GEMSTONES WHICH ARE A SEMI-TRANSPARENT LILAC COLUR. IT IS FULLY HALLMARKED WITH THE FOLLOWING:
S & Co (FOLLOWED BY) AN ANCHOR (FOLLOWED BY) A LION (FOLLOWED BY) A LETTER ‘O’
IT ALSO HAS THE WORD ‘SILVER’ STAMPED INTO THE MAIN GEM CASING AND THE WORD ‘STERLING’ ON THE FASTENER.
MANY THANKS,
STEVE
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S & Co are a birnmingham silver smiths founded first half of the 20th centary

Sydney & Co ,

Not sure on the gem stones without a closer look and value is hard also to determine