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Aaria London

Opal Square October Birthstone Ring

(4.8)

£325.00

Birthstone

Ring Size Guide

The most reliable way to find your size is to measure a ring you already own and love. Inside diameter is the measurement that actually matters, so if you are between two sizes, size up. A ring that is slightly loose can be worn. One that is too tight cannot.

Ring size chart

US size	UK size	Inside diameter	Inside circumference
2	D½	13.3 mm	41.8 mm
2.5	E½	13.7 mm	43.0 mm
3	F½	14.1 mm	44.3 mm
3.5	G½	14.5 mm	45.6 mm
4	H½	14.9 mm	46.8 mm
4.5	I½	15.3 mm	48.1 mm
5	J½	15.7 mm	49.3 mm
5.5	K½	16.1 mm	50.6 mm
6	L½	16.5 mm	51.9 mm
6.5	M½	16.9 mm	53.1 mm
7	N½	17.3 mm	54.4 mm
7.5	O½	17.7 mm	55.7 mm
8	P½	18.1 mm	57.0 mm
8.5	Q½	18.5 mm	58.3 mm
9	R½	18.9 mm	59.5 mm
9.5	S½	19.4 mm	60.8 mm
10	T½	19.8 mm	62.1 mm

Our rings run from a US 2 upward. If your size is not listed, email us, most designs can be made to order.

Method one: measure a ring you already own

Choose a ring that fits the finger you are buying for.
Lay it flat and measure straight across the inside, from one inner edge to the other.
Match that measurement to the inside diameter column above.

Use a ruler with millimetres and measure at the widest point of the inside circle. Half a millimetre changes the size, so measure twice.

Method two: measure your finger

Cut a strip of paper about 5 mm wide and 100 mm long. Paper works better than string, which stretches.
Wrap it snugly around the base of your finger, not tight, and mark where the ends overlap.
Lay the strip flat and measure from the end to your mark in millimetres.
Match that number to the inside circumference column above.

Buying for your little finger

A pinkie ring is usually a size or two smaller than the same person's ring finger, though it varies more than most guides admit, so treat it as a starting point rather than a rule. If you are borrowing a ring from another finger to work out a pinkie size, take a size or two off. If you can measure the actual finger, do that instead.

Our smaller sizes, US 2 to US 4, are the usual pinkie range.

A few things worth knowing

Measure at the end of the day. Fingers are largest in the evening and in warm weather, and smallest first thing and when you are cold.
Check the knuckle. The ring has to pass over it. If your knuckle is noticeably wider than the base of your finger, go up a size.
Wider bands feel tighter. If you are buying a chunky band, consider sizing up.
Buying a surprise gift? Borrow a ring they already wear on the right finger and use method one. If you are guessing, the most common size we sell is a US 6.

Still not sure?

Email us at info@aarialondon.com with the measurement you have taken and we will help. We would much rather get it right first time than have you send it back.

A bold yet elegant statement piece, the Square Molten Ring Opal features a luminous square-cut opal set within an organic molten bezel. Hand-carved in wax and cast using the traditional lost-wax method, each ring carries a fluid, sculptural texture inspired by molten gold, making every piece subtly unique.

As the birthstone of October, opal is associated with creativity, inspiration, and emotional expression. Its captivating play-of-colour shimmers with flashes of iridescence that shift in the light, evoking a sense of movement, depth, and quiet magic. The structured square shape contrasts beautifully with the fluid molten setting, creating a design that feels both modern and timeless.

Whether chosen to celebrate an October birthday, mark a meaningful moment, or simply for its enchanting beauty, the Square Molten Ring Opal is designed to be cherished for years to come.

Gemstone: Square-Cut Opal

Materials: 925 Recycled Sterling Silver or 14k Gold Vermeil over Recycled Sterling Silver.

Materials and Dimensions

Gemstone: Square-Cut Opal

Materials: 925 Recycled Sterling Silver or 14k Gold Vermeil over Recycled Sterling Silver.

3 Year Warranty

Every piece comes with a 3 year warranty, because we would rather you wore it than worried about it. If a clasp fails, a stone works loose or a setting gives way through no fault of your own, we will put it right: a repair, a replacement, or store credit of the same value if the piece is no longer available.

The warranty covers manufacturing faults. It does not cover general wear and tear, or damage from improper care: perfume and hand cream on the plating, chlorine or salt water, scratches from pieces stored loose together, knocks, accidental damage or loss.

To make a claim, email orders@aarialondon.com with your order number and clear photographs of the fault, and we will take it from there.

Delivery and Returns

Free UK standard delivery on orders over £150. Delivery is also free to the EU over €200, the USA over $300, and most other countries over £250. Your threshold is shown at checkout.

UK and USA 3 to 5 working days. EU 5 to 8 days. Rest of the world 7 to 10 days. Solid gold is made to order and takes 4 to 6 weeks to dispatch. Birthstone rings take 3 to 4 weeks.

No customs charges in the UK, the EU or the USA. We hold stock in all three, so your order ships from your own region and there is nothing to pay when it arrives.

Orders to the rest of the world ship from the UK and may be charged import duties and taxes by your own country's customs office. Those are set by them, not by us, and are paid by you when your parcel arrives.

If something is not right, you have 30 days to return it, unworn and in its original packaging. Personalised and engraved pieces cannot be returned unless they are faulty.

Care

Put your jewellery on last, after perfume and hand cream, and take it off before swimming, showering or the gym. Store pieces separately in the pouch they arrived in so they do not scratch each other. A soft dry cloth is all you need to bring the shine back.

Opal Square October Birthstone Ring

£325.00