Borrow against Diamonds
Release funds against your diamonds - quickly and at the lowest interest rates.
Your diamond could be the route to a short-term, low-interest, hassle-free loan. Unbolted will lend up to 70% of your diamond's value.
Valuing your diamond
For an accurate valuation we'll first need information regarding the 'Four C’s':
- Cut: Round brilliant, princess or emerald cut? Is your diamond cut to ideal proportions and do you have certificates?
- Colour: Do you have that rare colourless diamond or the intense blue of Hope Diamond?
- Clarity: Are your diamonds flawless or are they slightly included but eye-clean?
- Carat: How big is your diamond?
Certification.
We also look for certificates from institutes such as the GIA and AnchorCert. If these aren't available, our specialists can grade your diamond. We use Rappaport information combined with auction house knowledge. This helps us provide the maximum loan amount.
Diamond set in jewellery? No problem. If we can, we'll grade it in its mount. However, to properly grade larger diamonds we have these un-mounted by the industry's finest jewellers.
Ready to get started?
Submit an application today

Valuing Your Diamonds
We know how precious your diamonds are. Since small differences unseen by the naked eye can make such a dramatic difference, Unbolted only uses well known experts to determine the secondary market value.

Specialists in Diamonds
We work with Fellows, highly respected in both the UK and global markets based on a reputation earned by over one hundred years of selling diamonds. They have a team of approximately twenty full time specialists, many of whom hold formal qualifications in gemmology and diamond grading.

Storage and Shipping of your Diamonds
We understand the value of your diamonds and offer a fully insured process for you to send us your diamonds. Or you may arrange to take them personally to our office in the city or one of our partner's locations.
Our Guarantee
The lowest borrowing costs in UK
We believe that you cannot find a better offer but if you do we will beat it.
Fair and transparent terms
Unbolted never deducts fees upfront - so you receive the full loan amount.
You retain repayment flexibility - we don't impose early-repayment penalties.
If you find you can't pay back your loan we will sell your item - and we will return any surplus from that sale to you.
APR and Loan Terms
Minimum APR: 18.8%. Maximum APR: 63.1%.
All loans are for a fixed term of 6 months. You can repay early at any time without penalty.
Representative Example: Total credit: £4000. Set-up fees: £120. Loan term of 6 months. Annual Interest rate: 37.2% (fixed). Interest for 6 months: £766.32. Amount repayable in one installment: £4,886.32. Representative APR: 49.2%.
Risk Warning: If the loan is not repaid, the assets may be sold.
What our customers say
Borrow directly from peer-to-peer lenders at low interest rates. Rep APR: 49.2%
Reflections
How to buy a diamond
Diamonds are undoubtedly the most iconic gem stone of the past few hundred years age, but financially they can be either a fantastic investment, or a costly purchase.
The brilliant stones can be found in a range of settings, qualities and sizes. However, contrary to popular belief, just because a ...
Read moreThe art of valuing diamonds
Diamonds are included in the asset categories we use as collateral for our low-cost secured asset loans at peer-to-peer lender Unbolted. If you’re contemplating borrowing from Unbolted against a diamond you possess, here’s how we determine its value.
The Gemmological Institute of America (GIA) and the UK’s AnchorCert (both ...
Read moreShine on Coloured Diamond
Move over white – diamonds in rainbow hues are now on everyone’s wish list which means they are increasingly attractive! We find out why….
The Hope Diamond is probably the most famous coloured diamond in the world. The grey-blue stone (and its infamous curse) is sequestered inside the Smithsonian ...
Read moreThe Increasing Popularity of Coloured Diamonds
According to The Wealth Report, there has been a staggering 167% increase since 2005 in the value of fancy coloured diamonds, including pink, yellow and especially blue diamonds. Recent auction results are certainly reflective of this. Bonhams’ Fine Jewellery Auction of 2013 set the record at the time for the ...
Read more