How to Authenticate a Pre Loved or Second Hand Tiffany & Co Engagement Ring

How to Authenticate a Tiffany & Co Engagement Ring:

1. Tiffany & Co. Engagement Rings come with Hallmarks.

All Tiffany Engagement Rings are Platinum and will be Hallmarked 'PT950'. They also will have the Diamond Size in 'cts', 'Tiffany & Co.' and a unique SKU number. 

This unique SKU number is registered with Tiffany & Co's Database and will correlate to the Diamond and the Ring.

2. Tiffany & Co. Diamonds from approximately the year 2000 and onwards come with a unique serial number hidden in the Diamond.

This serial number is also present on the Diamond Certificate as well.
For Diamonds pre 2000 every Diamond is unique, and the Tiffany & Co. Diamond Certificates matches the unique characteristics of the Diamond ie H/VS2 etc which is also reflected in the Tiffany Records of Sale.

3. Tiffany & Co. only provide one Diamond Certificate per ring.  If the Tiffany & Co. Diamond Certificate is lost or damaged, they will not replace it.  

Pre-Loved Tiffany and Co Engagement Ring

The Diamond Certificate contains important information including the Diamond Grades, the Diamond Serial Number and the Ring SKU Number.  The Certificate also contains watermarks.  Pre 2000 the certificate comes in a black folder, post 2000 the certificate comes in a Blue Folder. 

4. Tiffany & Co. only provide one Ring Box per Engagement Ring.

If the ring box is lost or damaged they will not replace it.  The inner box is a black velvet box with Tiffany & Co on the lid, the outside box is the famous Tiffany Blue Box. 

Pre-Loved Tiffany and Co Engagement Ring

There are as many Tiffany & Co. Ring boxes in circulation as their are engagement rings. 

5. Tiffany & Co. provide a Letter of Valuation with each Engagement Ring.

This is also very difficult to replace if lost or damaged.  They will only provide this on request for the original owner for insurance purposes.

Pre-Loved Tiffany and Co Engagement Ring

The letter of valuation is an extremely important document that provides direct provenance of the ring. This letter provides information such as the sales person who sold the ring, the date of sale and the exact store the ring was purchased from. 

6. Tiffany & Co. also have a unique service in that they resize all of their Engagement Rings complimentary.  

Most of my customers have had their Tiffany & Co. Engagement Rings re sized complimentary.   If re sizing is not needed, Tiffany & Co. will clean the ring complimentary in store for life. This is usually a nice moment for couples to share.

7. The trifecta for a Tiffany & Co. Pre Loved Engagement Ring is a Ring that comes with: 

a) The Tiffany & Co. Diamond Certificate

b) The Tiffany & Co. Letter of Valuation and

c) The Tiffany & Co. Ring Boxes

It is possible to buy an authentic Tiffany Engagement Rings without all the paperwork, however authentication is much easier to establish with this information.

Please feel free to contact me here if you have any questions.  If you are looking to buy a Pre Loved Tiffany Engagement Ring, I am more than happy to help you authenticate the Ring.

Catherine Trenton Jewellery.

"We are an established boutique organisation specialising in pre-loved diamond designer jewellery from Tiffany & Co. and other luxury brands.  As experts in this niche trade we work hard to provide a safe and simple environment for buying and selling pre-loved fine diamond jewellery online.

Whether you are buying or selling a piece of fine diamond designer jewellery, we aim to provide you with the best outcome possible.

You can visit our store here."


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  • Mel Lim on

    Hello, would you mind teaching me how to read the serial number inscribed inside my Tiffany engagement ring please? I wonder what is D0.80 cts too. Thanks so much!

  • Pauline Tam on

    Hi CTJ,
    I want to purchase a Tiffany diamond ring as the seller only have the valuation appraisal but lost the Certificate. According to the information on the valuation appraisal, Diamond is E / VVS2 / 0.53CT, SKU# 23487306 , Diamond laser inscribed T& Co I04120155
    I want to know the details of the diamond, Cut, Symmetry, Polish, Table % , diamond measurements…
    Would u help me to check please.
    Thank you.

  • Stephanie J Harris on

    I have a Tiffany Lucida ring, which was my engagement ring, with the original receipt. I don’t know where any other documents are (since I did not buy it in the first place). I’d like to sell the ring. How can I go about proving to buyers that it is authentic?

  • MaryJo Mejia on

    Wondering if I can send a picture of a certificate and if you can provide more info about the certification
    Thank you

  • CTJ on

    Hi Anita, you can ascertain the diamond weight, colour and clarity from the individualised numbers in a Tiffany Engagement Ring. I will email you with more details.

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