Lustra Trois Radiance Silver Ring

Find Your Perfect Fit
Before selecting your ring, be sure to measure the correct finger on the correct hand — sizes can vary between hands. For the most accurate results, measure when your hands are warm, as cold temperatures can cause your fingers to shrink slightly. And don’t forget: the ring should comfortably pass over your knuckle without being too loose.

Measure an Existing Ring
Choose a ring that already fits the finger where you plan to wear your St geran ring.
Using a ruler or measuring tape, measure the inner diameter of the ring.

Record the measurement in millimetres.

Refer to our ring size chart above to find your corresponding size.

We use standard US sizing. For approximate conversions, refer to the table below. You can also purchase our ring sizer for greater accuracy.

Inner diameter (mm) Circumference (mm) (USA) Aus/UK
14.9mm 46.8mm 4 H
15.8mm 49.3mm 5 J
16.5mm 51.8mm 6 L - L1/2
17.3mm 54.3mm 7 N
18.2mm 57.2mm 8 P
19.0mm 59.7mm 9 R1/2-5
19.8mm 62.2mm 10 T1/2
20.60mm 64.7mm 11 V1/2

If you need further assistance, our customer care team is here to help — feel free to get in touch.

St geran uses the International Standard (ISO 8653) to define our ring sizes, based on measuring the inside circumference using a mandrel.

Please note that wide rings may be perceived as smaller in size than thin rings. All St geran Jewellery purchases made through our online store and boutiques come with a 3 month warranty. This warranty is effective from the date of purchase and covers manufacturing faults and defects in materials.

Please contact our Customer Care team at info@stgeran.com.au if you require any further information on our warranty or if you have any issues as our product quality is very important to us.

St geran accepts returns within 30 days of purchase. We do not accept returns on the following:Pierced earring styles for hygiene reasons.

Items purchased on sale or with a promo code (excluding newsletter signup).

Items must be returned in their original condition, undamaged, unworn and properly secured in the St Geran box provided.

All sale purchases are FINAL SALE and are not valid for refund, credit note, or exchange returns unless deemed faulty.For more information, please read our full Return Policy here

Read more on our Warranty.

Hypoallergenic Jewellery
At St Geran, our jewellery is thoughtfully crafted to be hypoallergenic, nickel-free, and lead-free, making it suitable for most sensitive skin types. Each piece is designed to feel as good as it looks, minimising irritation and promoting everyday comfort.
If you have a known allergy or material sensitivity, we recommend reviewing the Materials section on each product page for specific details.

18k Gold Plated & 925 Silver Plated Jewellery
Our 18k gold plated pieces are crafted by applying a rich layer of 18k gold over a quality base metal, most commonly copper, and occasionally stainless steel.
Similarly, our 925 silver plated designs feature a fine layer of genuine 925 silver plated over carefully selected base materials, such as brass or copper, creating a bright, polished finish.
While these finishes are created for durability, plated jewellery is naturally delicate and may fade or tarnish over time with exposure to moisture, chemicals, or frequent friction.

Care Instructions
To Preserve Your Pieces:
Avoid contact with perfumes, lotions, hairspray, and household cleaners
Remove jewellery before showering, swimming, or exercising.
Store pieces in a cool, dry place—ideally in a soft-lined jewellery box or anti-tarnish pouch, away from direct sunlight.
Use the anti-tarnish tab provided with your purchase to protect against moisture during storage.

To Clean:
Gently buff using a soft, dry polishing cloth.
Avoid abrasive materials or harsh polishing agents that may wear down the plating.

We are pleased to offer FREE express shipping on orders over $120.

For domestic orders under $120 a $9 flat rate shipping fee applies.