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Vintage Onyx and Diamond Ring outside
oval onyx cocktail ring
Onyx Jewellery
Onyx Jewellery Collection
Vintage Onyx and Diamond Ring
Vintage Onyx and Diamond Ring back
Vintage Onyx and Diamond Ring setting
Vintage Onyx and Diamond Ring wearing
Vintage Onyx and Diamond Ring on hand
Vintage Onyx and Diamond Ring on finger
Vintage Onyx and Diamond Ring grading card
Vintage Onyx and Diamond Ring certificate

Vintage 18ct White Gold 5.22ct Black Onyx and 3.64ct Diamond Cocktail Ring

A stunning and impressive, large vintage 5.22 carat black onyx and 3.64 carat diamond, 18 carat white gold cocktail ring; part of our diverse vintage jewellery collections

This stunning, fine and impressive vintage ring has been crafted in 18ct white gold.

The Art Deco style frame is ornamented with a feature collet set 0.42ct transitional modern brilliant round cut diamond, encircled by an impressive 5.22ct oval black onyx panel.

The onyx panel is framed by a border of twenty transitional modern brilliant round cut diamonds, totalling 3.22cts.

The elevated ring shoulders blend seamlessly with the plain hallmarked ring shank via a subtle cuff design.

This vintage onyx and diamond ring is hallmarked to the interior of the shank with the 18ct fineness mark (18CT).

This impressive cocktail ring is supplied with an IDGL diamond grading certificate for the feature diamond, in addition to an IDGL diamond and gemstone grading report card for the supporting stones.

This stunning onyx ring has a large anterior face for its type.

An onyx and diamond cocktail ring of this scale and design makes an exceptional statement piece, ideal for evening wear, formal occasions or special celebrations. The contrast between onyx and diamonds offers a timeless Art Deco-inspired aesthetic, appealing to those who appreciate bold vintage jewellery. Distinctive and elegant, this ring is perfect for someone seeking a standout piece with both character and enduring style, making it a treasured addition to any fine jewellery collection.

This impressive vintage 1950s dress ring is excellent quality, set with an impressive feature diamond displaying a fine white colour and brilliance.

The impressive supporting diamonds display a fine white colour and brilliance.

The black onyx ring is an excellent gauge of gold and is in excellent condition with a clear hallmark to the interior of the shank.

Additional information

Onyx Quality

Cut Oval
Content 5.22 carats
Dimensions 20.55mm (length) x 15.93mm (width) x 2.26mm (depth)

Diamond Quality

Feature Diamond
Colour K
Clarity P1
Cut Round Brilliant
Content 0.42 carat
Dimensions 4.80mm (average diameter) x 2.88mm (depth)

Supporting Diamonds
Colour (average grades) H
Clarity (average grades) SI1
Cut Transitional Modern Brilliant Round
Content 3.22 carats

Total Diamond Content
3.64 carats

Number of Diamonds
21

Dimensions

Length of setting 2.76cm/1.09"
Width of setting 2.14cm/0.84"
Height of setting 8.39mm/0.33"

Weight

11.79 grams

Ring Size

UK SIZE N 1/2 – USA SIZE 6 3/4

Metal

White Gold

Gemstone

,

Date

Circa 1950

Diamond Colour:

K

Can be Resized:

yes

FREE INTERNATIONAL SHIPPING
Dispatched via DHL (or equivalent) on the next working day.

Estimated Delivery:

  • UK: 2–3 working days
  • Worldwide: 5–7 working days

Fully Insured in Transit
Free insurance up to £30,000. AC Silver remains responsible until delivery is confirmed.

Returns & Cancellations
You have 14 days to cancel your order.

Returns must be sent to our UK address within 14 days of cancellation.

Customers are responsible for return postage. A refund will be processed after inspection of the returned item.

Altered or Personalised Items

  • Items resized or altered before dispatch: exchange or credit note only
  • Engraved silver: non-refundable

Full returns & cancellation policy

What our customers say

5.0 ★★★★★ ★★★★★ based on 201 reviews
★★★★★ ★★★★★

Lovely selection & excellent service

AC Silver has a stunning selection of antique and vintage items. Both of my brooches arrived right on time as indicated by the tracking. They are even lovelier in person and I look forward to wearing them for decades to come. Andrew and Gemma provided excellent communication and prompt dispatch. I would absolutely recommend working through them.
Christina 15 Jul 2026
★★★★★ ★★★★★

Fabulous service, beautiful product.

Fabulous service, beautiful product.
Imogen 24 Jun 2026
★★★★★ ★★★★★

Beautiful collection and outstanding service

Beautiful collection and outstanding service. I already bought two extraordinary pieces and can only highly recommend.
Christine 23 Jun 2026
★★★★★ ★★★★★

Excellent customer care.

I had to place the order over the phone as my internet was misbehaving. The lady who I spoke to could not have been more helpful and was particularly careful to get all the details correct. I was then informed about the collection and dispatch of the item purchased, by email. The item arrived as expected and it had been most well packed so that no harm could come to it. It was a delight to purchase this item from C6323, AC Silver, and I could not fault any aspect of their customer care. I was highly delighted with my silver mustard pot and it was much better than the pictures on the web site.
Hilary 20 May 2026
★★★★★ ★★★★★

Exceptional personal service

First class personal service and attention to detail along with an exceptional quality of items offered for sale. A very smooth purchasing experience with swift and safe despatch of high value objects via courier. Highly recommended.
Colin 28 Apr 2026
★★★★★ ★★★★★

A lovely experience

AC Silver's website is very detailed and informative - allows customers to make well good comparisons and subsequent choices. The owner and his staff are very helpful and friendly - dealing with them is a pleasure. They go the extra mile to make sure that customers are totally satisfied with their purchases. Would highly recommend this store.
Wendy 27 Feb 2026
★★★★★ ★★★★★

Excellent experience

Excellent experience buying a beautiful item from AC Silver. Enquiries were dealt with quickly and courteously, I felt very confident buying an expensive item online. It arrived quickly and safely, beautifully packaged. I am delighted with it and wouldn't hesitate to recommend AC Silver.
Susan 24 Jan 2026
★★★★★ ★★★★★

This was an all-around great experience. The pre-sale communication was excellent and informative. The team was extremely responsive. When the item arrived, it was exactly as described.

This was an all-around great experience. The pre-sale communication was excellent and informative. The team was extremely responsive. When the item arrived, it was exactly as described. I would recommend these guys to anyone.
26 Dec 2025

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