Diamonds and gems in good condition can certainly be used in your new piece. And while it's technically possible to melt down your old jewellery and use it in a new piece, it's not advisable. Here's why: when you re-melt gold, like we do when we're casting, you need to add at least 50% new metal or you get pits in the resulting casting.
With platinum, one should always start with 100% new metal because the results from remelting platinum never yields a quality ring. All jewellers take old platinum jewellery and other previously melted platinum to a refiner.
The problem with melting down your gold is we don't know what other metals it has been mixed with. Even 18K gold is still 25% other metals and gold is kind of like cooking -- every cook has their own recipe for that 25%. So, melting your old ring down to make a new one will yield a poor quality result.
If you would like to melt down or re-purpose jewellery you already own, we suggest selling the piece as is and using the proceeds against the cost of your new design. We want your jewellery to be exceptional so we advise against anything that could hinder the quality of the final result.
We can also use gems and diamonds from existing pieces to make something new. We love using heirloom gems because not only are they a more sustainable approach than using newly mined gems, but they also mean your new piece will hold the memories and history of your family.
You can either get a custom piece or set your gem(s) into one our existing styles here. We can also customize these styles for you, adding small diamonds to the side, adding different finishes--you name it! This is a great service because pretty much every company forces you to buy a diamond or gem from them in order to purchase a ring.
You can get started here.