Half a Victorian Sovereign set into an 18 Karat gold pendant

I have inherited a pendant with half a Victorian sovereign set into it. I would like to sell it for the highest value possible, and was hoping for some advice from this forum on how best to proceed. My question is do I sell it as scrap value or would it have extra value set in the pendant?

From the Numista catalogue, the coin is "Gold (.917) • 3.995 g ". I believe at todays gold price of USD 56/gram, this means the coin would have a gold value of 3.995*.917*56= USD 205. Someone on Ebay is selling a pristine coin for US$550 so it appears the coin is much more valuable than the gold value

https://www.ebay.com.au/itm/1893-1901-M-Australia-Gold-Sovereign-Victoria-Veil-Head-Avg-Circ-SKU-91481/114166784593?_trkparms=aid%3D1110012%26algo%3DSPLICE.SOIPOST%26ao%3D1%26asc%3D20200420083544%26meid%3D88652180f1d54d28a62b3e5e84509f05%26pid%3D100008%26rk%3D1%26rkt%3D12%26sd%3D123687965840%26itm%3D114166784593%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DPromotedSellersOtherItemsV2&_trksid=p2047675.c100008.m2219

The pendant /coin combo weighs approx 14 grams, and so the pendant component weighs approx 10 grams. It is stamped 18 karat, and with a gold value of USD 56/gram, the scrap value of the pendant component is USD 420. BTW I dont believe the stones are diamonds:(

Would someone please be able to advise the best way forward? As scrap it would realise about USD 625, but if the coin is realising $550 on its own, should I try to recover it? Would it realise its potential value set in a pendant? Or perhaps I should hang onto it and grow to love it?
Thanks so much:)

Sorry - it is NOT a half sovereign.
The portrait does not look correct.
The lettering does not look correct.
Compare to this original >
https://en.numista.com/catalogue/pieces24200.html

I now made this to show the differences I mentioned >
​
​and I also see the portrait does not touch the lower left edge like the original.
​Then the overall quality is not correct - too rough and way too shiny.
The colour is not correct also. Sorry.

Thank you Zac for going to the trouble of the flashing coins. It is much appreciated!

Just looking at the coin and the website they looked the same to me but they way you have the coins switching it is clear they are quite different. I have no idea where they come from- I just inherited a relatively full jewellery box:) The back of the pendant says it is 18 karat gold so I will simply add it to the pile I am accumulating to be melted down. That way there is no risk to anyone and I will be paid gold value, which in this day and age is a happy place:)

I also have a 1/10 OZ Krugerrand pendant. Would you mind looking at it for me and confirming it looks legit?

Thanks again
Louise

Yes, will do. Thanks