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Black Onyx Slice Stilla Locket Necklace


Availability: In stock

This gold locket necklace features a slice of deep black onyx set in 18 carat yellow gold plated sterling silver. The statement black onyx necklace can be engraved with a personal message, making for a special personalised jewellery gift. This gold personalised locket can also hold a special photograph, which we print and insert into the photo locket for free. Our photo lockets are the perfect fit for any occasion, just upload a photo and a message and we will create your future heirloom.

  • Gold locket necklace finished with our signature star-set white sapphire tag
  • The perfect personalised jewellery gift
  • Each gemstone has a unique appearance, therefore patterns may vary slightly
  • Use our photograph guide to personalise your engravable locket for free
  • Black onyx necklace with a statement gemstone slice
  • Styled here with the Lapis Lazuli Droplet Necklace and Sunrise Pendant
  • All of our gemstones are cut and polished by hand

"I've worn this necklace nearly every day since it arrived. It's fantastic quality, the perfect length, and easy to wear."

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Collection Stilla
Gemstone Onyx
Gemstone Details 16mm Flat slice
Metal Yellow Gold (Vermeil)
Metal Type Sterling Silver 925
Dimensions 18mm
Necklace Length Adjustable: 20"-22"
Engravable Back of Pendant
Photograph Size 16mm


UK Size US Size EU Size Diameter
F 3 44 14.1mm
G 3 1/2 45 14.5mm
H 4 46 14.7mm
I 4 1/2 48 15.2mm
J 5 49 15.6mm
K 5 1/2 50 16.0mm
L 6 51 16.4mm
M 6 1/2 53 16.8mm
N 7 54 17.2mm
O 7 1/2 55 17.6mm
P 8 56 18.0mm

To download the ring size guide or order your free ring sizer, visit our size guide.


Use our photograph guide to personalise your locket.

The story behind the stone…

Greek legend says that while Venus was sleeping, Eros cut her nails and left the pieces scattered on the ground. As no part of a heavenly body can die, Moirae - the goddesses who controlled the destiny of everyone from the moment they were born until they died - turned the translucent objects into onyx.

Gemstone slice
Shop Onyx Jewellery

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Free shipping on all United States orders.

  • Sent by Express Courier (Air)
  • Up to 4 working days delivery time

Free returns*

  • All items, including earrings, are returnable within 14 days of receipt.

*Excluding engraved pieces

Metal: Yellow Gold (Vermeil) | Gemstone: Lapis Lazuli | Verified purchase


I purchased this locket for my partner as a commemoration piece for the birth of our baby boy. I was so pleased with the quality and the engraving was a fantastic addition. highly recommend this item. I will definitely be back for Mother’s Day thank you Astley Clarke

Metal: Yellow Gold (Vermeil) | Gemstone: Lapis Lazuli | Verified purchase


Beautiful and elegant, I waited 4 years to treat myself to this necklace and it is perfect. Could not be happier with it!

Metal: Yellow Gold (Vermeil) | Gemstone: Mother of Pearl | Verified purchase


Is there a more thoughtful gift? So meaningful and special, I've bought several now and every single one is well-received and worn everyday. Thank you!

Metal: Sterling Silver | Gemstone: Mother of Pearl | Verified purchase


Excellent service and quality

Metal: Sterling Silver | Gemstone: Mother of Pearl | Verified purchase


Mum loved the locket with picture of her and my Dad in. Tears of joy on Christmas Day! Great quality and delivery service. Highly recommended.

Metal: Yellow Gold (Vermeil) | Gemstone: Lapis Lazuli | Verified purchase


Beautiful necklace. My granddaughter absolutely loves it

Metal: Yellow Gold (Vermeil) | Gemstone: Mother of Pearl | Verified purchase


My new favourite, love it layered with my pearl necklace.

Metal: Yellow Gold (Vermeil) | Gemstone: Onyx | Verified purchase


Not my first locket from Astley Clarke and unlikely to be my last! Absolutely beautiful, exceptionally well made and looks gorgeous on. Only downside is I never had the whole customer service experience as I ordered online amidst pandemic. Like everyone can’t wait until it’s all over and we are shopping face to face again!

Metal: Rose Gold (Vermeil) | Gemstone: Lace Agate | Verified purchase


Wonderful craftmanship, as always with Astley Clarke! Although the lace agate on my locket does not have the gergeous pinkish-purple hues as shown in your pictures, it is still a great piece.

Metal: Sterling Silver | Gemstone: Mother of Pearl | Verified purchase


I am totally in love with my necklace, it is absolutely beautiful. The picture is of my grandma who sadly passed away last christmas. The image you printed is of amazing quality, thank you so much. I can wear my necklace with literally anything because it is so modern and stylish and with my grandma being hidden inside the locket, she will always be close to my heart. I would recommend you to anyone and everyone. So grateful. The website was easy to navigate, the ordering process was stress-free and it was delivered promptly. All in all the service i received, the necklace i received and even the packaging was fantastic. Much appreciated, thanks again Astley Clarke!

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