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Luxury Packaging with Every Order

Luxury Packaging with Every Order

Every order arrives beautifully presented with our luxury packaging:

A signature velvet pouch designed to protect your jewellery and be kept forever

A Promise Card ready for you to write your own special promise, to a loved one, a friend... yourself!

Thoughtful. Gift-ready. Worth paying for but included free.

Delivery & Shipping - UK

Delivery

Delivery & Shipping - UK

Orders are shipped Monday–Friday.

Any orders placed after 1pm (local warehouse time) on Friday will not be shipped until Monday.

UK Shipping (from our UK warehouse)

Royal Mail 48 Hours: Delivery in 2 working days.

Royal Mail 24 Hours: Delivery in 1 working day (order before 1pm GMT to receive your parcel the next working day).

Our Size Guide

Our Size Guide

Not sure on your sizing? Need to secretly measure for a loved one? Find our handy printable PDF.

US/Promise Co Diameter (mm) Circumference (mm) UK Europe
4 14.9 46.8 H ½ 47
5 15.7 49.3 J ½ 49.3
6 16.5 51.9 L ½ 51.9
7 17.3 54.5 N ½ 54.4
8 18.1 57 P ½ 57
9 18.9 59.5 R ½ 59.5
10 19.8 62.1 T ½ 62.1
11 20.6 64.6 V ½ 64.6
12 21.4 67.2 X ½ 67.2
13 22.2 70 Z ½ 70

Giveaway T&Cs

The Promise Co. - $200 Voucher Giveaway Terms & Conditions

For the purposes of these Terms and Conditions, "The Promoter" refers to The Promise Co. (TikTok handle: @thepromiseco). The "Prize" refers to a $200 voucher.

By entering this competition, you agree to be bound by these Terms and Conditions.

All entries must be received by 11:59pm on April 26th 2026. One (1) winner will be selected and contacted on or after this date via TikTok DM.

Eligibility & Entry:

  • No purchase is necessary to enter.
  • Entrants must be 18 years or over at the time of entry.
  • Entrants must be located in a country The Promise Co. ships to.
  • Employees of The Promoter are not eligible to enter.
  • Only one entry per person will be accepted.

How to Enter:

  • To enter, participants must post a video following The Promise TikTok Trend as outlined by Abby Franklin @AbbyFranklin17
  • Entries must be posted publicly on TikTok before the closing date.

Winner Selection & Prize:

  • One (1) winner will be selected at random from all valid entries.
  • The winner will receive a $200 voucher for The Promise Co.
  • The voucher is non-transferable, non-refundable, and no cash alternative is available.
  • The voucher is valid for 12 months from the date of issue.
  • The Promoter reserves the right to substitute the prize with one of equal or greater value if necessary.

General:

  • The Promoter is not responsible for any entries that are lost, delayed, incomplete, or invalid.
  • The Promoter will not be held liable for any failure of entry submission.
  • To the extent permitted by law, The Promoter’s liability shall be limited to the cost value of the prize.
  • The Promoter reserves the right to cancel, amend, or suspend the competition where necessary.
  • The Promoter’s decision is final, and no correspondence will be entered into.

Data & Publicity:

  • The winner may be asked to provide contact details for prize fulfilment.
  • The winner’s TikTok handle may be shared across The Promise Co.’s social channels.

Disclaimer:

  • This promotion is in no way sponsored, endorsed, administered by, or associated with TikTok.