I live in the Uk, is Import taxes/duty payable for reworking of own jewellery in the EU?

I am sending to 2 heirloom rings from the uk to finland (eu) for reworking into a different design. The rings will contain all my own jewels with some additional metal (platinum).
Will i have to pay import taxes/duty even though they were originally mine?
The cost to have the work carried out will be approx €2000