Triangulum
Oriented Natural Black Diamond Triangle Engagement Ring
Triangulum is a 2.33 carat triangle shaped black diamond engagement ring in 14K yellow gold. The 2.33 carat center is a natural, earth-mined black diamond, color enhanced as stated on the certificate, held in a smooth gold bezel, with round white accent diamonds (0.27 carats, G color, VS clarity) set along both shoulders. 2.6 carats in total. Sizes 4 to 9, from $2,465, made to order in 10-14 business days.
What is a triangle shaped diamond?
A triangle diamond, also called a trillion or trilliant cut, has three equal sides, often with slightly curved edges. In a black diamond the shape does all the talking: the stone is opaque, so you see a crisp black triangle with polished facets instead of sparkle.
Is a black diamond a good choice for an engagement ring?
Black diamonds are diamonds, 10 on the Mohs scale, so they resist scratches and suit daily wear. Like any diamond, a sharp corner can chip from a hard knock, which is why Triangulum wraps the whole stone, corners included, in a gold bezel. Read are black diamonds durable? and how they compare to onyx, spinel and moissanite.
More from the Black Ice collection: black diamond engagement rings for women, black and white diamond rings and, for a white triangle diamond, the Brilliant Flame pendant. New to black diamonds? Start with our black diamond engagement ring guide.
Tax excluded.
Your dream ring starts here.
Jewelry should be as unique as the person wearing it. Whether you have a clear vision or just an idea, we’re here to bring it to life with a bespoke design that tells your story.
Fill out the form below to share your inspiration, and our team will contact you to schedule a consultation. Let’s create something truly special together.
Processing and Shipping
Most of our jewelry is made to order. Please allow 10-14 business days to complete the making of your piece. Once it is ready, we will produce a shipping label with FedEx You will have the tracking number immediately. Once FedEx picks up your package, they will deliver it within 7-12 business days to most parts of the world.
All shipments are the quickest FedEx has to offer.
All shipments are fully insured and sign-required.
We do not ship to P.O boxes.
USA customers may need to fill out the 5106 form stating to their local customs that they were the ones to make the order. It takes only 2 minutes to fill.
Link to download FORM 5106
Link to 5106 filling instructions
Additional Fees and Charges
Diana Rafael is not responsible in any way for Customs charges/import Fees. Please note that Diana Rafael is unable to guarantee delivery time for international orders due to local Customs procedures and other formalities beyond our control.
Aug 3rd. 2025 Update - President Trump has applied a 15% tariff on all physical goods entering the USA.
This means you may be subject to paying a total of 15% to US Customs once your items are delivered.
Diana Rafael and its employees have nothing to do with this and carry no liability for any payment that was either made or is demanded from you by any US authority.
Return Policy -
We offer a 30-day return policy, so our customers can purchase with confidence, knowing they will have sufficient time to return if they are not completely satisfied. If any problem arises, please contact us at customercare@dianarafael.com and let us know, and we will find a solution.
You should let us know of your intention to return your item and ship it back within 30 days of receiving your item.
If your return/exchange is approved, Diana Rafael will issue a return shipping label with DHL and email it to you. Please do not issue a shipping label independently. Once you receive your return shipping label you should pack the item safely in its original jewelry box, wrap it up with bubble wrap & tape, and place it in its original box and tape again. Please attach the shipping label to the larger box.
If for any reason you are not happy with your purchase, you can return the item for a refund minus shipping, handling, and restocking fees which are $300 of the total price of your order.
If you choose to exchange an item due to a manufacturing defect or damage, there will be no additional costs for shipping and handling of the item.
We apologize for the inconvenience, but 18k rings, rings in sizes 9 US and over, or size 4 US and below, and personalized or custom orders of all kinds aren't eligible for returns for a refund.
There are no returns or cancellations on items purchased on a 10% + discount.
Custom or personalized items can't be returned or exchanged.
Because of the nature of these items, unless they arrive damaged or defective, we can't accept returns for custom or personalized items.
Items bought ready to ship, with customization (gold color replacement, carat weight change, main diamond exchange, or any alteration of the ring) will not be refundable- EXCHANGE ONLY
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
You will receive a full refund minus shipping, handling, and restocking fees which are $300 of the total price of your order.
This applies as long as your wish to return the item has been expressed within the proper time frame, and the item was recieved back in Diana Rafael's location exactly how it left it.
Custom Orders
Custom-made jewelry is not eligible to free returns but is eligible for exchanges within 30 days from delivery.
Terms and conditions
Diana is obligated to deliver every item as described and specified on the website. All diamonds are natural earth mined diamonds (unless mentioned otherwise) purchased on various diamond exchanges around the world from authorized diamond dealers and jewelers.
Item set with man-made / lab-grown diamonds will be marked accordingly.
Pricing
Pricing errors may happen due to technical or human error reasons. In any case, Diana Rafael holds the right to cancel an order of such an item. Notification regarding the cancelation will be sent to the buyer. In case the order was already shipped the buyer must either return the item or pay the price differences.
Visibility
The appearance (size, colors, details, resolution) of photos on the website may change with all types of screens. Therefore, some of the jewelry may appear smaller or bigger than its actual size. There is no way to make sure that the picture will represent the size and/or color and/or clarity of all stones and/or jewelry. All Carat weights are accurate within the range of 0.03 carat.
Conflict-Free Diamonds
All of Diana Rafael's diamonds suppliers are WFDB membered companies and abide by the standards and regulations of the Kimberly Process. The international standard tries to ensure that the traded diamond's origin will be conflict-free.
Property
all images, designs, logos, names, policies, sounds, videos, data, graphics, other files (collectively, "Site Materials") are the exclusive property of Diana Rafael Jewelry. No use of any kind is allowed to anyone and/or any entity worldwide without the explicit and written permission of Diana Rafael Jewelry.
Privacy Policy
Diana Rafael will never share/send/sell/giveaway/trade your personal information and/or purchase history with any person and/or business. We are committed to protecting your privacy online. The information we gather will be only use for Diana Rafael's commercial purposes, conditioned with your consent. We reserve the right to change the Privacy Policy at any time. Such changes will be notified to all clients by email. Your continued use of the site after such modifications will constitute your: (a) acknowledgment of the modified Policy; and (b) agreement to abide and be bound by the modified Policy
Diana Rafael's jewelry care program applies to all gems (diamonds among others), the jewelry in which they are set in, and labor.
Cases in which you Jewelry care won’t apply
- You didn’t notify us immediately about your need for repair.
- Indications of other authority were in-touch with your item were detected.
- Indications that the damage was not a manufacturing defect or was caused by natural causes were detected.
If your item shall suffer damage of any kind, you will ship your item to a designated address. Once we receive your item, we will inspect the nature of the damage, determin how it was caused and share our conclusions.
Any manufacturing defect and/or cracks and/or breaks and/or weakening and/or other damage of manufacturing causes will be repaired rapidly by Diana Rafael FREE OF CHARGE, including shipping charges. This will apply for the lifetime of your item.
Please note, manufacture damags should present themselves within a few days of delivery. We will only accept manufacturing defects claims made within a reasonable timeframe.
Any damage that does not originate in manufacturing, quality of labor, will be fixed at a pre-set cost. Every situation will be priced accordingly. The customer will also bear shipping costs.
We at Diana Rafael are responsible for our customer's satisfaction and here-by commit to FAIR COSTS for every service call.
Diana Rafael Jewelry Care Program includes:
- Yearly cleaning and polishing (customer will bare turnaround shipping costs)
- One resizing (customer will bare turnaround shipping costs)
*Please note that slight irregularities and variations in craftsmanship or natural characteristics, or internal inclusions, visible or otherwise, in colored gemstones are unique and individual to each item. These characteristics are considered as part of the character of the item, and should not be considered a defect.
30 Days Return & Exchange
Free FedEx Express Insured Shipping
Layaways Option Available
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Triangulum
Oriented Natural Black Diamond Triangle Engagement Ring
Tax excluded.
NEW HORIZONS
DIANA RAFAEL IN BRITISH VOUGE
Inspired by the night skies, constellations & our magical cosmos, a one-of-a-kind Diana Rafael came to life to reflect everything within you in a single piece.
Our pieces manifest your intimate inner duality and unique frequency by combining black and white natural diamond in extraordinary designs
SHINE ON
LET YOUR INNER LIGHT SHINE
YOUR INNER ENERGY WANTS TRANSFORM INTO A LIVING FORM EXPRESSING EVERYTHING IN & ABOUT YOU.
WE ARE HERE TO RING OUR THE BEST IN YOU
Need help?
Frequently Asked Questions
Order
We do ship worldwide. We ship with FedEx Express - a fully insured and signature required shipiment.
We do not ship to P.O boxes.
Please note that some international shipments may be liable for additional customs fees and taxes per your local Custmos regulations
Our services include: resizing, polishing, prong tightening etc. You can refer to our Jewelry Care Program page.
You can also contact our customer care for further questions.
It depends on where you are. Orders processed here will take 2-3 weeks to make and ship. Overseas deliveries can take anywhere from 7-10 days. Delivery details will be provided in your confirmation email.
You can contact us through our contact page! We will be happy to assist you.