A tensile structure on your hand. Made with the same rules, Portal takes inspiration from the physic principles of the Hyperbolic Paraboloid, to create a sinuous and dynamic form: the perfect fusion between architecture and maths.

The new black plating is composed of a layer of silver and palladium with a coloured coating.

Sizes are based on the diameter of the ring. Available sizes are UK H to R, but other sizes are also available on request. Please If you need more help, check out our size guide.

If you are not delighted with your purchase, just return the item in its original condition within 30 days for a full refund, less shipping costs. More info here.

This is item is Made To Order.

Shipping on "Made To Order" and custom products generally takes 3-4 weeks due to the extensive craftsmanship involved. For more shipping information, please click here.

A tensile structure on your hand. Made with the same rules, Portal takes inspiration from the physic principles of the Hyperbolic Paraboloid, to create a sinuous and dynamic form: the perfect fusion between architecture and maths.

Gold is our premium option, perfect for everyday wear and timeless pieces. It is available as 14k solid gold. It has a subtle, warm yellow colouring. On request, We can manufacture in 18k solid gold and two other colours: the red gold has a rose tinge and the white gold looks like silver with a slightly yellow tint.

Sizes are based on the diameter of the ring. Available sizes are UK H to R, but other sizes are also available on request. Please If you need more help, check out our size guide.

This is item is Made To Order.

Shipping on "Made To Order" and custom products generally takes 3-4 weeks due to the extensive craftsmanship involved. For more shipping information, please click here.

If you are not delighted with your purchase, just return the item in its original condition within 30 days for a full refund, less shipping costs. More info here.

A tensile structure on your hand. Made with the same rules, Portal takes inspiration from the physic principles of the Hyperbolic Paraboloid, to create a sinuous and dynamic form: the perfect fusion between architecture and maths.

The new black plating is composed of a layer of silver and palladium with a coloured coating.

Sizes are based on the diameter of the ring. Available sizes are UK H to R, but other sizes are also available on request. Please If you need more help, check out our size guide.

If you are not delighted with your purchase, just return the item in its original condition within 30 days for a full refund, less shipping costs. More info here.

This is item is Made To Order.

Shipping on "Made To Order" and custom products generally takes 3-4 weeks due to the extensive craftsmanship involved. For more shipping information, please click here.

A tensile structure on your hand. Made with the same rules, Portal takes inspiration from the physic principles of the Hyperbolic Paraboloid, to create a sinuous and dynamic form: the perfect fusion between architecture and maths.

Gold is our premium option, perfect for everyday wear and timeless pieces. It is available as 14k solid gold. It has a subtle, warm yellow colouring. On request, We can manufacture in 18k solid gold and two other colours: the red gold has a rose tinge and the white gold looks like silver with a slightly yellow tint.

Sizes are based on the diameter of the ring. Available sizes are UK H to R, but other sizes are also available on request. Please If you need more help, check out our size guide.

This is item is Made To Order.

Shipping on "Made To Order" and custom products generally takes 3-4 weeks due to the extensive craftsmanship involved. For more shipping information, please click here.

If you are not delighted with your purchase, just return the item in its original condition within 30 days for a full refund, less shipping costs. More info here.

A tensile structure on your hand. Made with the same rules, Portal takes inspiration from the physic principles of the Hyperbolic Paraboloid, to create a sinuous and dynamic form: the perfect fusion between architecture and maths.

Silver is a precious metal with a very high electrical and thermal conductivity. The alloy we use is 925 Sterling Silver, a high quality silver alloy commonly used in jewellery and other skin-safe applications.

Silver will tarnish over time, but can be polished back to achieve a like-new surface.

Sizes are based on the diameter of the ring. Available sizes are UK H to R, but other sizes are also available on request. Please If you need more help, check out our size guide.

This is item is Made To Order.

Shipping on "Made To Order" and custom products generally takes 3-4 weeks due to the extensive craftsmanship involved. For more shipping information, please click here.

If you are not delighted with your purchase, just return the item in its original condition within 30 days for a full refund, less shipping costs. More info here.