Plum Diamonds: Trust Check

The bottom line. Plum Diamonds sells lab-grown diamond engagement rings, wedding bands and jewelry^5,6 from Chicago, where its terms give an address on S. Wabash Ave.⁷ and Google rates its listing 5.0 from 52 reviews⁸. It says it is women-owned and makes its pieces in its own workshops⁵, with a sister company, Ethan Lord Jewelers⁵; its domain dates from 2021⁹. Rings ship free by overnight FedEx, insured and signed for⁴; most pieces can be returned free within 30 days of delivery⁴; and rings get free lifetime care — repair of manufacturing defects, a yearly cleaning, polishing, prong check and rhodium plating, and a free resize every year^1,2. Payment is by card, PayPal or Shop Pay Installments on a Shopify checkout^2,7, and its Trustpilot score is 5.0¹⁰. Points are lost because the site names no company^{2,5,7,11,12,13} and gives its co-founder’s first name only⁵; Ready-to-Ship rings, engraved rings and Lashbrook bands carry restocking fees^4,14; center diamonds aren’t replaced under the warranty¹; no appraisal is mentioned^{1,2,3,4,14,15,16,17,18,19,20,21,22,23,24}; and its pages name different grading labs — ‘GIA or IGI’ on the diamond pages, IGI, GIA, AGI or GCAL in the FAQ^2,20.

Plum Diamonds policies at a glance

How Plum Diamonds scores

We are still looking for Plum Diamonds on the BBB; the score will be updated when that's done.

The same rules apply to every store. How the Trust Score works

Who is behind Plum Diamonds

The site says it is operated by ‘Plum Diamonds’⁷ and names no company form — no LLC or Inc.^{2,5,7,11,12,13}. Its terms and privacy policy give 5 S. Wabash Ave., Ste 208, Chicago^7,11; Google lists the business in the same building, at Ste 704B⁸. The FAQ says Plum is owned and operated in Chicago by teams led by women jewelry professionals². The About page introduces the co-founder only as ‘Kristy’⁵; press coverage names the co-founder as Kristy Cullinane²⁶, and an Instagram snippet mentions a partner named Emily who runs the manufacturing side²⁷.

Plum says it crafts its jewelry in its own workshops, that its manufacturing side has been making jewelry for 50+ years, and that its sister company is ‘Chicago favorite Ethan Lord Jewelers’⁵. On Reddit, Kristy describes running ‘an online jewelers and a brick and mortar jewelers’²⁸. Its home page calls Plum newer online than traditional jewelers¹³; the plumdiamonds.com domain was registered in March 2021⁹.

How to reach Plum Diamonds

You can call or text 844-844-3638 or use the live chat, Monday to Friday from 9am to 5pm CST¹². Email goes to [email protected]¹², and the contact form promises an answer within 24 hours¹²; returns go through [email protected]⁴. To pause or cancel an order, email as soon as possible².

Returns & exchanges

Plum offers free returns within 30 days of delivery on jewelry that isn’t custom or altered, outside its Ready-to-Ship collection⁴; the FAQ and product pages say the same^2,16. Email [email protected] and it sends a prepaid, insured FedEx label⁴. Rings must come back in their original condition for a full refund⁴, and using the wrong carrier or drop-off location can void the return⁴.

Several fees apply. Ready-to-Ship rings can be returned within 30 days of receipt with free return shipping, but 10% is kept as a non-refundable restocking fee that you can use toward an exchange^4,22. Rings returned with engraving or hidden birthstones lose $100, and $75 is deducted if the diamond paperwork or packaging is missing⁴. Lashbrook men’s bands carry a 10% non-refundable restocking fee, stated on their product pages¹⁴.

Custom orders and pieces that have already been exchanged, resized or altered are final sale⁴. Exchanges are handled case by case⁴, and if you return an order or cancel during production, your next purchase gets an exchange instead of a free return⁴.

Shipping & delivery

Plum ships jewelry by FedEx standard overnight, free within the lower 48 and for $35 to Alaska and Hawaii; shipments are insured and need an adult signature⁴. Its FAQ limits the signature to orders over $500 and says other fine jewelry ships by free standard shipping — insured USPS or FedEx 2nd-day — or $15 overnight². It doesn’t ship internationally⁴.

Most rings are made to order and ship after about 15–17 business days; Ready-to-Ship rings and stud earrings ship in 3–5⁴. We found no process for a parcel lost on its way to you^2,4,7,15; for returns, using the right carrier and drop-off location is your responsibility⁴.

Warranty & aftercare

Plum calls its warranty ‘free lifetime care’². If a ring has a manufacturing defect, it repairs or replaces it at no cost¹. Once a year you can send in an engagement or wedding ring for free resizing, polishing, prong tightening, rhodium plating, cleaning and replacement of lab diamonds under 2mm, with shipping both ways¹; the first visit can be any time 12 months after delivery¹. The FAQ puts it as a free resize within the first year and then one every year after that². Extra servicing between visits typically costs $100–$250¹.

Damage from an accident beyond normal wear isn’t repaired for free¹, servicing by another jeweler ends the plan¹, and center diamonds aren’t replaced under the lifetime warranty — Plum recommends insuring the ring¹. Mini Bezel rings get no free annual servicing, and resizing them costs $50².

What Plum Diamonds sells & what it costs

Plum works only with lab-grown diamonds⁵. Its product feed is mostly loose lab-grown diamonds, with engagement rings, wedding bands and jewelry⁶. Prices on the pages we checked run from $225 for a sterling silver pendant to $12,355 for a 4.09ct D IF radiant lab diamond; a diamond band is $3,640 and 2.0 ctw studs $1,490^16,17,19,24.

On grading, its pages don’t agree. Loose-diamond pages promise ‘GIA or IGI certification’²⁰. The FAQ says every lab diamond has a certificate from an independent lab ‘such as’ IGI, GIA, AGI (Accredited Gemological Institute) or GCAL², and its lab-diamond guide says ‘most’ are graded by AGI — which it calls the American Gem Society — IGI and GIA³. The Ready-to-Ship ring we checked has an IGI-certified 2.76ct center with its certificate number²²; the 2.0 ctw studs use IGI-certified stones, the smaller studs uncertified ones¹⁷. Certified stones are laser-inscribed with the certificate number and identified as lab-made³. We found no appraisal offered with a purchase^{1,2,3,4,14,15,16,17,18,19,20,21,22,23,24}.

Yellow and white gold rings are 18k (14k on request) and rose gold 14k, without the alloy named¹⁶; platinum is described as 95% platinum alloy². Some pendants also come in sterling silver or gold-plated sterling silver, with no plating thickness given^6,18,19. Plum says its manufacturing facility is a certified member of the Responsible Jewellery Council, that all its fine gold is certified 100% recycled, and that its diamond growers are certified under the SCS-007 sustainability standard²⁵. Its try-on kit uses diamond simulants of 1.0–3.0 carats, clearly called simulants, and is free if returned within 7 days².

Payment & financing

The store runs on Shopify⁷ and accepts debit and credit cards, PayPal, Apple Pay and Google Pay². You can pay over time with Shop Pay Installments, at 0% to 36% APR depending on eligibility, or with Affirm^2,16; with Affirm, a payment may fall due before your order arrives²⁹.

What customers say

Google shows Plum Diamonds’ Chicago listing, in the Wabash Ave. building its site gives, at 5.0 from 52 reviews^7,8. Its Trustpilot TrustScore, as Google shows it, is 5.0¹⁰, from between 375 and 400 reviews according to Google’s snippets³⁰. We found no BBB profile in Google results and are still checking by hand.

Reddit posts quoted by Google are positive: one poster says ‘they were so kind’ and the prices ‘seem fair’³¹, another praises ‘incredibly fast service, fair prices’³², and a third calls Plum ‘very responsive and easy to work with’³³. A search for complaints turned up praise instead³⁴.

Official social profiles

Linked from Plum Diamonds’s own website, so these are the brand’s real accounts.

Alternatives to Plum Diamonds

• Grown Brilliance — Lab-grown diamonds with free UPS return labels and IGI or GIA reports for center stones
• Ritani — Certified diamonds and engagement rings with free, insured, signed-for shipping
• Keyzar Jewelry — Lab-grown and natural diamond engagement rings with free, insured return labels and a lifetime manufacturing warranty

Plum Diamonds FAQ

How we score stores

The Trust Score adds up 100 points across six areas: identity & transparency (20), purchase protection (25), warranty & aftercare (15), product transparency (15), payment safety (10), reputation (15). Every point is tied to a fact we can link to, and the rules are the same for every store. Read the full methodology.

90+ Excellent · 75–89 Trustworthy · 60–74 Mostly reliable · below 60 Proceed with caution. Ratings from other platforms are summarized in our own words with a link; we don’t copy reviews.

Update history

• Nov 3, 2026 — First published, before our editor’s review. Every fact checked against plumdiamonds.com and the other sources listed below as they read that day.

Sources

All pages were read on Nov 3, 2026. Store policies change — check the store’s current terms before you buy.

1. Plum Diamonds — Free Lifetime Care Warranty & Sizing | Plum Diamonds
2. Plum Diamonds — Frequently Asked Questions About Lab Grown Diamonds | Plum Diamonds
3. Plum Diamonds — Guide – Lab Created Diamonds 101 | Plum Diamonds
4. Plum Diamonds — Shipping, Returns, and Exchanges | Plum Diamonds
5. Plum Diamonds — Discover Exquisite Fine Jewelry | About Us | Plum Diamonds
6. Plum Diamonds' product feed (products.json on plumdiamonds.com, first 2,000 products)
7. Plum Diamonds — Terms of Service Conditions | Plum Diamonds
8. Google search: plum diamonds
9. Domain registration record (RDAP)
10. trustpilot.com: Plum Diamonds Reviews | Read Customer Service … — Google result snippet, Nov 3, 2026
11. Plum Diamonds — Privacy Policy on Personal Information | Plum Diamonds
12. Plum Diamonds — Reach Out Today! Jewelry Contact | Plum Diamonds
13. Plum Diamonds — home page
14. Plum Diamonds — product page: 14K Yellow Gold + Polish Finish
15. Plum Diamonds — Plum Diamonds Gifts and Promotions
16. Plum Diamonds — product page: Emerald Cut U-Prong Band
17. Plum Diamonds — product page: Round Lab Grown Diamond Studs Earrings 2ctw White Gold
18. Plum Diamonds — product page: The Joker Mahjong Tile Necklace
19. Plum Diamonds — product page: The Joker Mahjong Tile Necklace
20. Plum Diamonds — product page: Emerald 2.66ct D VVS1
21. Plum Diamonds — product page: Emerald Cut U-Prong Band
22. Plum Diamonds — product page: Ready-to-Ship Radiant Cut Cathedral Ring | Plum Diamonds
23. Plum Diamonds — product page: Radiant 3.06ct E VS1
24. Plum Diamonds — product page: Radiant 4.09ct D IF
25. Plum Diamonds — The Importance of Ethical Jewelry Sourcing | Plum Diamonds
26. instoremag.com: Plum Diamonds Launches Highest Quality Lab Grown … — Google result snippet, Nov 3, 2026
27. instagram.com: Plum Fine Jewelry Founder (@kristycullinane) — Google result snippet, Nov 3, 2026
28. reddit.com: Kristy @ Plum Diamonds (u/kristy_diamond_wmn) — Google result snippet, Nov 3, 2026
29. Plum Diamonds — How to Buy Now, Pay Later with Shop Pay | Plum Diamonds
30. trustpilot.com: Plum Diamonds Reviews | Read Customer Service … — Google result snippet, Nov 3, 2026
31. reddit.com: Plum diamonds : r/LabDiamonds — Google result snippet, Nov 3, 2026
32. reddit.com: Plum Diamonds Review : r/labdiamond — Google result snippet, Nov 3, 2026
33. reddit.com: Most Convenient Buying Experience Recommendations … — Google result snippet, Nov 3, 2026
34. tiktok.com: Plum Diamond Ring Review — Google result snippet, Nov 3, 2026