Geoff Marion & Kerry Schilke: Rare Winza Bi-Colour Sapphire Ring In 18ct White & Rose Gold

What would it be like to wear one of the world's rarest sapphires? You could soon find out with one of these three super rare, limited edition, Winza bi-coloured sapphire rings handmade by Melbourne jewellers Geoff Marion & Kerry Schilke.

Expertly crafted in solid 18 carat white and rose gold, featuring Geoff & Kerry's signature style and high quality finish, these rings are truly one of a kind in every sense of the word.

Arguably some of the rarest Sapphire material in the world. Winza bi-colour Sapphire is known to come from only one 28 hectare area discovered in 2007 and now no longer producing gem quality material. At it's height, 95% of all material mined was non facet grade. Facet grade Sapphire with clear colour zoning was only found in an amount of roughly 1 1/2 cups per year! These amazing Sapphires are locally mined, single source, unheated, untreated and super rare. Each gem is unique due to the patterning caused by the colour distribution.

We are exceptionally lucky to have only three Winza sapphire rings available now at Studio 42. 

Whether you are looking for an engagement ring that is unlike any other, a special dress ring that can never be replicated or you are a collector of rare stones, these breathtaking gems will answer the call.


Design Specifications


Metal Alloy:

 18 carat white gold band & 18 carat rose gold setting

Stone :

 Winza bi-colour sapphire, natural, untreated 0.70ct


 Stone: approx 5.08mm x 3.95mm


Width of ring at top of setting: 5.40mm

 Width of band at bottom: 2.40mm

Ring Size:

 N 1/2

Suitability for resize or modification:

 Contact us for resize enquiries



 Weight: 4.7 grams



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