Guinevere Blue Diamond Engagement Puzzle Ring in Platinum

Princess cut blue diamond on Guinevere four band puzzle ring
Princess cut blue diamond on Guinevere four band puzzle ring

Guinevere Blue Diamond Engagement Puzzle Ring in Platinum


  • Description
  • Guaranteed Fit
  • Blue Diamond Quality
  • Blue Diamond Delivery
  • Assemble 4-Band
  • Reviews (0)


Item #GUIN-BLD-16604

A Guinevere engagement puzzle ring set with a one-half-carat or larger blue diamond is resplendent in platinum. A Celtic knotwork-inspired puzzle ring weave suggests the intertwining of you and your beloved’s lives into one.

Your puzzle ring will be hand-woven, in contrast to the majority of puzzle rings which are cast from molds. Our brilliant engagement ring artist will custom weave your engagement puzzle ring precisely for the very stone you select, its very shape and size, so your engagement ring will be a true, one-off original.

Use the video under a tab above on this page to learn to put this four-band, genuine, working puzzle ring together. Then amaze your friends and loved ones with your skill!

Your diamond size options:
Approximately 3/8ths CT (0.375 CT);  4mm square
Just over 1/2 CT or 0.55 CT;  4.5mm square, shown
Approximately 0.75 CT or 7.5/10ths CT;  4.75mm square
Approximately 1.05 CT;  5.5mm square

Precious metal options: This page features this stunning ring in platinum.

Puzzle ring weave: Select your weave: The Guinevere diamond ring on this page has a tight weave. You may choose an open or standard weave if you prefer. See the options link below to help you decide on the weave you like.

Ring sizes: Available in whole, half, and quarter sizes 3 – 10.5; other sizes upon request.

The Guinevere blue diamond engagement puzzle ring is artisan-crafted in the U.S. and offered exclusively by Crystal Realm.

When you use our ring sizer prior to our making your ring, we guarantee your fit. You may order the sizer before you order your ring. Or when you order your sizer at the time of your ring order, we’ll hold your order until you confirm your size by email. 

Once you’re used our sizer, if we deliver your ring, and it does not fit, we pay for the round-trip shipping for your free ring resize or replacement within the U.S. and provide a discount for overseas shipping.

There are two ways to request our sizer:
1. Order your ring sizer for a modest fee before you order your ring(s): Order your ring sizer here.
2. Request a sizer as part of your order at the time that you order your ring(s), and we will hold your order, send your sizer, and wait for an email from you with your size(s).
In either case, we will mail a ring sizer to you promptly. This is a physical, plastic set of rings in whole and half sizes that you can play with until you are certain you have a correct size. And if you find one plastic ring is too big and one is too small, we can make a quarter size for you. Please follow our included instructions for best fit.

Our blue diamonds are white diamonds treated with heat to produce a brilliant blue color. They have VS (high) clarity, are available in a variety of carat weights, and they are very beautiful. They are now certified (New!).

Our blue diamonds are not covered by our one free year of loss protection for white diamonds. We recommend insuring your ring through your homeowner’s policy or Jewelers Mutual Insurance. The benefit of using Jeweler’s Mutual Insurance is that they cover mysterious disappearance without a police report. Homeowner’s policies tend to require a police report, even if you are certain you lost your ring when you were swimming at the lake! Jeweler’s Mutual Insurance is the same insurance company that insures just about every jewelry business in the country. They are well respected and reliable. (And no, we don’t get a cut!)

We do not offer untreated, natural blue diamonds, as we do not have a reputable source for them. We’re not wild about natural blue diamonds, anyway, even if we could find them, as they are very costly and don’t have the brilliant, intense, blue color of the heat-treated diamonds.

Blue diamonds, even the treated ones we carry, are challenging to find. When you order a blue diamond ring, we will search for your diamond and will communicate with you about how the search is going. Please allow 6-8 weeks for the delivery of your blue diamond ring. 

When you order a blue diamond ring with a shadow band, we will need to pickup and retain the engagement ring after you propose with it, so that we can mate the shadow band  to the engagement ring perfectly.

When you order a blue diamond engagement ring with another type of wedding band, the two rings may be delivered separately or together.


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Blue Diamond Size

Puzzle ring weave

Used our standard U.S. ring sizer? *

Puzzle ring size (3 – 10.5)

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