Current scrap prices from a very reputable dealer who pays really well (prices change all the time depending on current spot price of gold so these may not be valid by the time you read this)
£15.61 per gram for 9ct hallmarked.
£24.25 per gram for 14ct hallmarked.
£31.09 per gram for 18ct hallmarked.
Will be lower if not hallmarked.
If there are stones involved, their weight won't count towards the gold scrap price & the stones may be almost worthless by themselves depending on type/size/quality/style.
Unless it's very particular pieces with a high resale value as a piece of jewellery usually because of it's maker, you are selling it for melt price as that's all it's worth, which is going to be lower than intrinsic value as it needs melting/processing etc..
Disreputable companies will offer much lower prices than that.
Sort out what you have, stick it on a scales by carat to get a very rough idea & see if you think it's worth it.
Please bear in mind that precious metals prices are much lower than jewellery is priced.
.925 hallmarked silver has a scrap value of around 30p per gram.