Astra Diamond Ring - Round Lab Diamond

Name: Astra Diamond Ring - Round Lab Diamond
Brand: James & Irisa
SKU: JIAST3686TON
Price: 3950.0 AUD
Availability: InStock

AU$3,950.00

Stone size

Metal

Find your ring size

Choosing the right ring size is crucial for comfort and security. Whether you’re buying a ring as a surprise or for yourself, it’s important to get the size right the first time. This guide provides detailed methods to measure your ring size accurately at home, ensuring you find the perfect fit.

Method 1: Using Our Downloadable Ring Sizer

Step 1: Download the Ring Sizer

Download Printable Ring Sizer

Step 2: Print the Ring Sizer

Print the ring sizer at 100% scale (do not use the “fit to page” option). Ensure accuracy by measuring the scale on the printout with a ruler.

Step 3: Use the Ring Sizer

For Existing Rings: Place your ring over the printed circles on the sizer. The circle that fits perfectly within the inside edge of your ring is your size. Make sure the ring aligns exactly with the inner edge of the circle to ensure an accurate measurement.

Method 2: Manual Measurement Using String or Paper

If you don’t have a printer, you can still accurately measure your ring size.

Step 1: Gather Your Tools

A piece of non-stretchy string or a thin strip of paper
A ruler with millimeter (mm) markings
A fine-tip marker or pen

Step 2: Measure Your Finger

Wrap the String or Paper Around Your Finger: Ensure it fits snugly but isn’t too tight.
Mark the Overlap Point: Use a marker to indicate where the string or paper overlaps.
Measure the Length: Lay the string or paper flat and use a ruler to measure the distance from the start to the marked point.

Step 3: Find Your Ring Size Using the Chart Below

Use your finger’s circumference measurement to determine your ring size from the chart:

Inside Diameter (mm)	Inside Circumference (mm)	AU/UK Size	US/CA Size
13.1	41.1	D	-
13.3	41.7	D 1/2	2
13.5	42.4	E	-
13.7	43.0	E 1/2	2.5
13.9	43.6	F	-
14.1	44.2	F 1/2	3
14.3	44.9	G	-
14.5	45.5	G 1/2	3.5
14.7	46.1	H	-
14.9	46.8	H 1/2	4
15.1	47.4	I	-
15.3	48.0	I 1/2	4.5
15.5	48.6	J	-
15.7	49.3	J 1/2	5
15.9	49.9	K	-
16.1	50.5	K 1/2	5.5
16.3	51.2	L	-
16.5	51.8	L 1/2	6
16.7	52.4	M	-
16.9	53.0	M 1/2	6.5
17.1	53.7	N	-
17.3	54.3	N 1/2	7
17.5	54.9	O	-
17.7	55.6	O 1/2	7.5
17.9	56.2	P	-
18.1	56.8	P 1/2	8
18.3	57.4	Q	-
18.5	58.1	Q 1/2	8.5
18.8	59.0	R	-
19.0	59.6	R 1/2	9
19.2	60.3	S	-
19.4	60.9	S 1/2	9.5
19.6	61.5	T	-
19.8	62.2	T 1/2	10
20.0	62.8	U	-
20.2	63.4	U 1/2	10.5
20.4	64.0	V	-
20.6	64.7	V 1/2	11
20.8	65.3	W	-
21.0	65.9	W 1/2	11.5
21.2	66.6	X	-
21.4	67.2	X 1/2	12
21.6	67.8	Y	-
21.8	68.4	Y 1/2	12.5
22.0	69.1	Z	-
22.2	69.7	Z 1/2	13
22.4	70.3	Z+1	-
22.6	71.0	Z+1 1/2	13.5
22.8	71.6	Z+2	-

Additional Tips for Accurate Sizing

Measure at the Right Time: Your fingers can change size throughout the day. Measure your finger at the end of the day when your fingers are at their largest to ensure the best fit.
Consider Knuckle Size: If your knuckle is larger than the base of your finger, you may need to size up. Measure both your knuckle and the base, then choose a size that fits comfortably over your knuckle.
Double-Check: It’s a good idea to measure multiple times to ensure accuracy.

Why Accurate Sizing Matters

Getting the correct ring size ensures that your ring is comfortable to wear and stays securely on your finger. A ring that’s too tight can be uncomfortable and difficult to remove, while a ring that’s too loose may slip off and get lost. By following these methods, you can confidently determine your ring size at home and ensure your new ring fits perfectly.

Still Have Questions?

At James and Irisa Jewellery, we’re here to help with any additional questions you may have. If you’re uncertain about your measurements or need more personalized advice, please feel free to reach out. We’re committed to ensuring you find the perfect fit for your jewellery.

Contact us today for expert advice and to explore our collection of beautiful, perfectly fitting rings.

Made to order. Ship out in: 7 weeks

Estimated Shipping Date: Calculating...

Description

The Astra Diamond Ring is a refined fusion of vintage charm and cosmic inspiration. At its centre is a brilliant round diamond, flanked by elegantly pear white diamonds that echo the geometry of the Art Deco era. Set in our signature meteorite-textured setting, the design captures both softness and structure — a balance of classic form and modern artistry.

Whether chosen for an engagement or a meaningful moment, Astra is a radiant symbol of connection, individuality, and timeless light.

*** Each ring is individually hand-textured, meaning no two are ever exactly the same — every piece is truly one of a kind.

Materials

Centre diamond: Round lab grown white diamond, D colour, VS1 clarity, Excellent polish / symmetry, IGI certified

Side diamonds: 2pcs of 3x2mm pear and 2pcs of 1.5mm round Lab grown white diamond, DEF colour, VS clarity, total Approx. 0.13ct

Band: Approx.1.5mm knife edge band

*** The ring featured in the image is showing a 1ct centre diamond.

*** We use only ethically sourced, premium-grade lab-grown diamonds—hand-selected for exceptional cut, clarity, and brilliance. Each stone is curated to meet our high standards within its grade.
While availability may result in a diamond slightly above the listed weight (e.g., 1ct+), we never select below—ensuring your stone always meets or exceeds your chosen size and quality.

Made to order engagement ring and delivery

This is a made to order item. Please allow around 7 weeks to finish.
Free express shipping for all domestic orders. The standard or express shipping option is upon customers' choice at checkout for international orders, which cost is calculated at checkout. For more shipping information, please refer to our shipping policy.

Diamond Jewellery Care

All natural and lab diamonds used in James and Irisa jewellery are hand picked with highest quality in the class. Diamond is the hardest among all gemstones, In order to keep the diamond in a good condition for a long time, it is recommended to avoid chemical compounds like any detergent, shampoo, body washer etc. If your diamond jewellery ever had a contact with these chemical matters above, please use clean warm water to wash it off immediately.

Jewellery Insurance

Considering to insure your beautiful James and Irisa Jewellery?
Q Report provides cover both inside and outside your home. You will be insured for damage, theft or even loss. It is an agreed value policy with many more features and benefits, including the ability to return to us as your preferred jeweller for replacement or repair.Learn more about protecting your jewellery with QReport here

Ethically sourced materials

Worldwide shipping

Expertly crafted in Melbourne

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Let customers speak for us
from 14 reviews

Anonymous

08/31/2025

Wedding Band & Engagement Ring

We are repeat customers of James & Irisa’s after having purchased a custom engagement ring in 2021. Having been thrilled with their craftsmanship and exceptional customer service, it was imperative to us to be return customers when it came time to order a wedding band. Another seamless process and James & Irisa have again gone above & beyond to provide a positive experience to us. Their resizing process was also second to none. Thanks again!

Custom Order For Rocco C

Karen

07/22/2025

The wedding band suits my engagement ring

The wedding band suits my engagement ring beautifully!!

Bespoke Order For Karen O

Darcy S.

05/25/2025

Talk about engagement!

From start to finish, James and Irisa were unbelievable. Irisa looked after me and guided me throughout the whole process and putting up with my constant emails and questions. The ring came out better than I could’ve imagined! I’m sure that was the true reason she said yes.

Thank you James and Irisa for everything.

Bespoke Order For Darcy S

Krystie T.

05/09/2025

A delighted customer

I am beyond words upon receiving my beautiful black opal ring. It is exactly how I envisaged and what the photos/videos Irisa sent me. Absolutely stunning! Their designs are so unique and that was the main reason why I went ahead with them.

Irisa has been such a pleasure to deal with. Efficient and professional. The whole process was such a great experience thanks to her.

I can’t recommend them highly enough. Thank you James and Irisa, for creating a piece of “superpower” for me.

Bespoke Order For Krystie T

Elena Z.

04/20/2025

I’m completely in love with my emerald eternity ring. The French fishtail setting adds such an elegant, vintage touch—it’s delicate yet secure, and the way it lets the light in around each emerald is just stunning. The stones are beautifully vibrant, and the craftsmanship is flawless. It’s everything I hoped for and more. Thank you for bringing this dream piece to life.

James & Irisa

Nelson R.

03/06/2025

I just wanted to say thank you so much for the gorgeous ring! I have attached a photo of it, she was so happy with it.

James & Irisa

Helen G.

12/04/2024

Subtle yet sparkling

Absolutely gorgeous! I purchased as a new everyday wedding band for an active lifestyle so my wedding set (also from James and Irisa) doesn't knock on everything. The band is lovely and makes a statement without being huge. Great quality as always too.

Domed Textured Band

Aimee M.

09/26/2024

Amazing!

James and Irisa were amazing every step of the way when designing and making my fiancés engagement ring. We ended up making significant changes to the original design and they were very accomodating. The ring is gorgeous and very well made. My partner and I love it and wouldn't change a thing. Highly recommend!

Custom Order For Aimee C

Tanika a.

09/03/2024

We just received Tom's wedding band, it's absolutely perfect!
I love the way you added the larger peaks, and it fits just right too.
Thank you again for being part of our engagement/soon to be wedding.
It means a lot to us that we both have such unique and sentimental rings from the same place. Your service has been exceptional!

James & Irisa

Michelle

05/19/2024

I couldn't be happier with the stone and the diamonds and the setting and the whole darn thing.

James & Irisa

Elena Z.

03/03/2024

I couldn't have dreamed of a more perfect engagement ring. The yellow diamond is absolutely radiant—so full of warmth and sparkle—and the unique cluster design makes it feel like a one-of-a-kind treasure. The craftsmanship is exquisite, and it feels incredibly meaningful to wear something so thoughtfully made. I still catch myself staring at it in the sunlight. Thank you for making this moment even more magical.

James & Irisa

Tristan

01/12/2024

I hope this find you well I just want to say a massive thank you for producing such a beautiful ring for my beautiful now fiancé, you guys made this a very easy and stress free experience I will most definitely be recommending you to all my friends and will be making purchases from you again

James & Irisa

Anya

05/23/2023

Absolutely stunning, exactly what I asked for!

Custom Order For Anya D