Golden Spiral Pendant - Math Jewelry
This necklace is inspired by the golden spiral. The golden spiral is a logarithmic spiral whose growth factor is the golden ratio, a mathematical constant. The golden ratio, designated by the Greek letter "phi," equals 1.618 and represents the ratio of a line cut into two segments of different lengths such that the ratio of the whole segment to that of the longer segment is equal to the ratio of the longer segment to the shorter segment. The golden spiral approximates a fibonacci spiral, but only at later turns.
There are many examples in nature of organisms that display the golden spiral in their design, for example, spiraled seashells and snail shells, galaxies, hurricanes, pine cones, sunflower seed heads, and petal placement in many flowers. To honor its importance in nature, the Ontogenie golden spiral pendant is adorned with arches that represent the inner walls of a seashell.
The Golden Spiral pendant is 2 cm (0.8 in) wide and 3 cm (1.2 in) long below the loop.
The pendant is 3D printed in solid sterling silver or 14K gold plated brass, finished with a 45 cm/18 inch long sterling silver or gold plated silver chain, and is ready for gift giving with a gift box, polishing cloth, and care instructions.
All orders over 50 Euro ship FREE. Under 50 Euro shipping = 5.50 €
Jewelry Shipping
Jewelry in stock at Ontogenie will be ready for shipping within 1-3 days. Jewelry on backorder requires 3-4 weeks production time before it can be shipped.
Transit times:
- Germany: 3-4 days
- EU: 3-7 days
- Europe, non-EU, except for Switzerland*: 5-7 days
- USA: 9-12 days
You will be notified by mail when your order ships and given a tracking number so that you can follow your shipment.
Your jewelry will be gift-wrapped in original Ontogenie packaging.
Please note that packages may be delayed for reasons beyond my control. In the unlikely event that your jewelry shipment is held by your local customs office, you are responsible for paying any customs fees, duties, tariffs, or import taxes incurred.
*No shipping to Switzerland or Canada.
**Orders to the United Kingdom of more than 135 GBP/158 Euro will incur import duties that must be paid by the customer at the time of receipt of the package in the UK. If you do not pay the import duties, the jewelry will be destroyed or returned, and your order will not be refunded.**
Art Prints, T-Shirt, Mug, and Tote Bag Shipping
Printing of these products requires 2-7 days fulfillment time at a printing facility as close to your location as possible. After fulfillment, your shipment should arrive in 3-10 business days.
Jewelry is limited to stock on hand. If you are interested in a specific piece that isn't in stock, please contact me.
T-shirts, hoodies, mugs, tote bags, and art prints are printed at a shop near you and are always in stock.
EU GPSR Compliance Information
T-Shirts & Hoodies
Manufacturer contact information
Name: Gelato
Email address: support@gelato.com
Postal address: Dronning Eufemias gate 8, 0191 Oslo, Norway
Age guidelines: For adults
Warranty (consumer-sales only): 2 years
Product safety compliance:
Comply with regulatory requirements on dangerous substances (lead, cadmium, phthalates, and formaldehyde).
Comply with regulatory requirements on flammability.
Art Prints
Manufacturer contact information
Name: Gelato
Email address: support@gelato.com
Postal address: Dronning Eufemias gate 8, 0191 Oslo, Norway
Age guidelines: For adults
Warranty (consumer-sales only): 2 years
Ceramic & Enamel Mugs
Manufacturer contact information
Name: Gelato
Email address: support@gelato.com
Postal address: Dronning Eufemias gate 8, 0191 Oslo, Norway
Age guidelines: For adults
Warranty (consumer-sales only): 2 years
Product safety compliance:
Comply with EU regulatory requirements on dangerous substances (lead and cadmium) leachable from ceramic or enamel drinkware.
Comply with regulatory requirements on flammability.
Tote Bags
Manufacturer contact information
Name: Printful
Email address: support@printful.com
Postal address: Raina bulvaris 25, Riga, Latvia, LV-1050
Age restrictions: For adults
EU Warranty: 2 years
Jewelry
Manufacturer contact information
Name: Ontogenie Science Jewelry
Email address: ontogenie3d@gmail.com
Postal address: Schroeterstr. 6A, 07745, Jena, Germany
Age restrictions: For adults
EU Warranty: 2 years
Metal Compositions
Silver: Silver 93%, Copper 4%, Zinc 3%
14K gold plated Brass: Copper 80%, Zinc 15%, Tin 5% with a 0.5 micron layer of gold
Bronze: Copper 90%, Tin 10%
Chains and Earring hooks are made of silver or 14K gold plated silver and are nickel-free, lead-free, and cadmium free.
