Golden Ratio Ring

28,900 AMD

The Golden Ration Ring proves that concrete is for more than just construction.

Designed and handmade by TUMO Studios students during an atelier led by Studio Mondocubo.

Read all about Studio Mondocubo’s atelier with TUMO Studios and how the students came to love working with concrete on the TUMO Studios Blog.

Material: Brass, gold plated + concrete

Available sizes:

Small (ø 15,9mm)
Medium (ø 16,6mm)
Large (ø 18,1mm)

SKU: 00009 Categories: , , , , , , Tag:


Inventory and Production

Upon successful online payment, your ‘in-stock’ order received before 7 PM (Yerevan time, GMT+4) will be shipped the next working day.

Since our products are handcrafted and unique, your ‘out-of-stock’ order requires 7-10 days for production from the time of placement.


We accept all major credit and debit cards. Our payments are handled safely by Yerevan-based Ameriabank, with branches in Armenia, the United Kingdom, and the United States.

In accordance with Armenian law, you will be billed for all transactions in Armenian dram (AMD) at the current rate provided by your card issuer. Any prices shown in other currencies are indicative only and shown for reference. Please contact your card issuer for an exact conversion rate.


TUMO Studios works with several shipping companies to provide safe and securely tracked international shipping all over the world, directly to our customers. You’ll receive order updates via email each time the status of your order changes and a tracking number once your order has shipped.  

Tracked delivery times:

  • Within Yerevan: 1 working day
  • Within Armenia: 3 working days
  • Mainland Europe: 15-20 working days
  • United States & Canada: 15-20 working days
  • Russia: 8-10 working days
  • Rest of the world: 15-20 working days

More Information

More details about payment, shipping, and our return policy are available here.

Additional information

Weight 0.1 kg

Large, ø 18,1mm, Medium, ø 16,6mm, Small, ø 15,9mm