The science of DNA uniqueness
Journal · Science
Why no two genomes produce the same DesigNA piece, even for siblings or identical twins, with the underlying biology explained clearly.
What we read
The human genome contains around three billion base pairs. The vast majority is shared across all humans. What makes individuals different is a small set of variations, including single nucleotide polymorphisms (SNPs) and short tandem repeats (STRs).
DesigNA reads a curated set of markers chosen for their design properties. These markers vary widely between individuals but do not encode any clinical, ancestral, or behavioural information. They are useful precisely because they are uninformative medically and highly variable visually.
Why each design is unique
When you combine multiple variable markers, the number of possible outputs becomes astronomical. Even reading a small number of polymorphic markers produces more unique combinations than there are people who have ever lived. In practice, the probability of two unrelated people producing the same DesigNA design is effectively zero.
Twins, siblings, and the limits
Identical twins share around 99.9 percent of their DNA. Most consumer genetic tests cannot distinguish between them. DesigNA can, because we read markers including microsatellite regions that mutate at higher rates than the rest of the genome. The result is that twins produce noticeably different DesigNA designs.
Siblings, parents, and children share less DNA (around 50 percent on average), so their designs differ much more visibly. We have made DesigNA pieces for entire families, and the necklaces sit together as a related but distinct set, much like the family itself.
What it does not tell you
Worth restating clearly. A DesigNA necklace is a design output, not a diagnostic, predictive, or ancestral report. We do not read disease risk markers. We do not generate an ancestry breakdown. We do not store enough of your genome to do either later.
Why this matters for the wearer
Most personalised jewellery is meaningful because of what is engraved or chosen. A DesigNA piece is meaningful because of what is read. The wearer did not select the arrangement, biology did. The piece is therefore an honest record of a single person at a single moment, captured in stones and metal, certified, and impossible to duplicate.
See how it works
A four part series on DNA jewellery
The lab side, the design side, the craft side, and the certificate. Sent over a week. No discount, no pressure.
We will never share your email. Unsubscribe anytime.
Written by Oliver Sullivan, founder of DesigNA, with input from our partner laboratory. Updated May 2026.
Further Reading
DNA Jewellery
What Happens After You Order: The Sampling Kit, Step by Step
Wondering what happens after you order? Here is exactly how the DesigNA sampling kit works, from the moment it lands to the moment you post it back.
August 4, 2026
No Comments
DNA Jewellery
Who Is the Founder of DesigNA?
Who is the founder of DesigNA? Oliver Sullivan, through Double Strand Ltd. Here is who runs the brand and how every necklace is really made.
July 31, 2026
No Comments
DNA Jewellery
9 Precious Stones or Something Else? The DNA Necklace Materials FAQ
Does a DesigNA necklace use nine precious stones? Here is exactly what your DNA necklace is made from, and how your genetic code shapes it. From £299.
July 28, 2026
No Comments
DNA Jewellery
How Long Does a DNA Necklace Take? Your Order to Delivery Timeline
How long does a DNA necklace take from order to delivery? Here is the full stage by stage UK timeline, so you can order gifts with real confidence.
July 24, 2026
No Comments
DNA Jewellery
DNA Necklace Care: Silver, Gold and Pearl, Looked After Properly
Simple DNA necklace care steps for silver, gold and pearl pieces, so your one of one design stays bright for years to come.
July 20, 2026
No Comments
DNA Jewellery
DNA Necklace: The Real One, Explained
Searching for a genuine DNA necklace? Compare real genetic jewellery to look alike designs and see why DesigNA’s UK made necklace is the trusted choice.
July 15, 2026
No Comments