Aventura's Premier
Jewelry Buyer & Lender

Xammany Vongratsamy

Aventura, FL

With a career spanning more than 30 years, Xammany Vongratsamy is one of the most experienced luxury jewelry experts in the Florida area. She has worked for many of the world’s most prestigious brands, including Tiffany & Co., Patek Philippe, Cartier, Chopard, Chanel, Breguet, Harry Winston, Jaeger LeCoultre, and Girard Perregaux.

Xammany is known for her no-nonsense approach to evaluating your jewelry items—she knows exactly what she’s looking for and how to get you the highest possible offer. If you’re looking to sell your jewelry or secure an asset-based loan, Xammany has the expertise and experience to help you make the right decision.

954-323-8475 xammany@diamondbanc.com Book Appointment Get a Quote

What Clients Are Saying…

Solomon Rubert-Schewel ★★★★★ Great service thank you!Response from the ownerYou’re welcome anytime. Chris RealBoy ★★★★★ Bob Van Meter ★★★★★ My experience with Xammany was excellent. I had many small pieces and she took the time to test every piece for authenticity. When we finished we agreed on a price and I was issued a check on the spot. I thoroughly enjoyed my experience and if you need your jewelry appraised for a more than fair evaluation I would highly recommend Xammany and her services. Very happy with my results.Response from the ownerThank you Sir. It was a pleasure to assisted you. Xavier Langford ★★★★★ I was so impressed with this business, I not only got my loan from them without issue, but I got MORE than I expected. I highly recommend anyone who is looking to do business with jewelry to come see Diamond Banc!! Xammany is one of a kind, great personality, very professional and welcoming.Response from the ownerThank you so much Xavier Tom Soares ★★★★★ Xammany made the transaction seamless & would highly recommend working with her – she’s a ROCK STAR !Andre Walters ★★★★★ Success leaves clues. While it was apparent we were doing business. At no point did it feel like a transactional meeting. Xammany is the definition of personable and truly puts the client first. A great conversationalist but most importantly a genuine person. I personally will definitely be back in the future. Don’t hesitate you will have a great experience working with her.Response from the ownerThank you so much Sir. It’s a pleasure to assisted you anytime. Stephanie Díaz Gomez ★★★★★ The meeting we had today with Xammany was absolutely wonderful. First we felt welcomed and at ease with her evaluation of our jewelry. At no time did we feel uneasy or unsure she was not giving us not only her full and undecided attention but her expert assessment. She was thoughtful as she was honest and straightforward which we appreciated. We left the gorgeous office feeling like we truly got the best offer we could have been given. Thank you for your time your follow ups and amazing welcome. We will be sure to refer whoever is interested in selling their jewelry to what we now know without a doubt is the best place to go, Diamond Banc with Xammany !Response from the ownerThank you so much for your kind words and it was a pleasure to meet you and your husband Mr. Gomez. Marvel Saint Hilaire ★★★★★ It was great from start to finish! Xammany was very informative and was clear and concise. I was very comfortable and it was a smooth processResponse from the ownerThank you Marvel. It was a pleasure to assisted you and have a wonderful Birthday celebration! Daruco Pacouloute ★★★★★ Excellent service , Xammany you are truly a blessing thanks again !!Response from the ownerYou’re welcome anytime Sir! Alejandro Izquierdo ★★★★★ Anastasia Mayfat ★★★★★ Will give more than 5 starts . Very professional. Will recommend. This place is the one you want to go. 🥰🥰🥰Response from the ownerThank you so much Anastasia. Please stop by anytime. Sari Mitchell ★★★★★ I am so thrilled to leave this review about a fabulous woman I met today. I was looking for a reputable company to sell my jewelry to and I was overjoyed when I met Xammany at Diamond Banc. We spent a good hour together and, she took me step by step through the process of what selling my jewelry to a reputable company, was like. My spirits were down when I walked in the door and, by the time we had finished, she had me feeling stronger and good about myself and the goal I need to set for my next endeavor. I really loved spending time with her and learning about her family. It showed just how much she loves her work. She made sure that I got the absolute top dollar for my jewelry and I am so glad that I went to see her today. If you want to meet a true professional that will treat you with the utmost respect, you have found her. Thank you so very much Xammany and I look forward to our next encounter. Hugs and Kisses SariResponse from the ownerI am blessed and truly honored to have you as a client of mine Sari. You’re welcome anytime and stay blessed always. Elizabeth Delicio ★★★★★ Great experience! RecomemdedResponse from the ownerThank you Elizabeth. It was a pleasure to assisted you. YARMELI LARES (Yarme – La Chinita) ★★★★★ Professionalism and expertise. Thanks!!Response from the ownerThank you so much Yarmeli. It was a pleasure to assist you even though we didn’t buy this deal, at least you now have the knowledge about diamonds value. Taylor Beck ★★★★★ Larissa Paiva ★★★★★ Xammany is such an amazing person! Will come back for sure ♥️Response from the ownerThank you Larissa! It’s a pleasure to meet you and you’re welcome always. Aaron PB ★★★★★ Really friendly, professional and so happy.👌🏻Response from the ownerThank you so much Aaron. Jeff Auguste ★★★★★ Marcello Oliveira ★★★★★ They are very professionalI’ e got a loan with my Rolex and I really recomend this placeResponse from the ownerThank you Sir! Omendez ★★★★★ Excelente servicio, te explican todo acerca de tu joya.Response from the ownerMucho Gracias! Federico Olivares ★★★★★ Very helpful a very good rate thank you very muchResponse from the ownerThank you Sir. Raymond Long ★★★★★ I would absolutely recommend this place, I got my Rolex authenticated here and Xammany is such an amazing person that I would always return and recommend anyone that is looking to sell or anything! I would give 10 stars but I can’t 🙁 amazing amazing amazingResponse from the ownerThank you Ray. It was a pleasure to assisted you. Monserrat Esperanza ★★★★★ Rollena Griffin ★★★★★ Great business woman love her energyResponse from the ownerThank you so much. Please stop by again anytime. rukballthai ★★★★★ Find out about Diamond Banc on instagram, after few conversations over the text with the owner Xammany, she made appointment for me after hour (Saturday) to give free evaluation and authenticate my watches. She is very nice person, knowledgeable, and professional. She also educates me about the watch and jewelry. Very happy to meet her. Thank you so much.Response from the ownerThank you so much and it was a pleasure to assisted you and your wife.Please don’t hestitate to stop by anytime.

See all Google Reviews

Get a Quote

In Person or Online

Schedule a private evaluation at your local Diamond Banc or use our online submission form.

Start a Quote

In-Person Evaluation

Complete In Person

Meet privately with a Diamond Banc director who’ll evaluate your items right in front of you & make you an offer.

Get Funded

Fast & Secure

If you accept our offer, we will issue payment immediately via check or wire transfer.

Amazing experience. Xammany gave me an appointment on a Saturday which is a day that they are not open, and was very professional and helpful with me getting a loan. I definitely recommend this place to anybody that is trying to sell or take out a loan. Thank you so much, Xammany!

Juan R. via Google

Diamond Banc of Aventura is THE go-to destination to sell or borrow against your fine jewelry and luxury watches! The manager is an expert buyer, super knowledgeable, and professional. You’ll definitely get the deal here!

Jason P. via Google

Visit Our Location

Located on the 11th Floor of the Forum Aventura building, just across the renowned Aventura Mall, Diamond Banc of Aventura provides a discreet and secure environment for clients looking to meet with our jewelry and watch experts. Upon arrival, check in with the receptionist at the front desk, who will then direct you up to our suite.

Diamond Banc in Aventura offers a range of services for clients looking to sell their luxury assets, including gold, diamonds, and luxury watches. As the top jewelry buyer and equity lender in Aventura and the surrounding areas, Diamond Banc takes pride in offering clients a simple, transparent, and hassle-free selling experience.

Why Choose Diamond Banc of Aventura, FL?

Diamond Banc operates nationwide to provide consumers with an unrivaled menu of options to access the liquidity their fine jewelry and watches possess, via immediate sale, Jewelry Equity Loan, or consignment sale. Our firm operates in a branded, modern fashion. Diamond Banc’s office in Aventura was opened to service a discriminating and affluent clientele in a prompt and confidential manner. Our Aventura location is positioned to routinely work with clients from Bal Harbour, Coconut Grove, Aventura, North Miami, and North Miami Beach.

We provide consultations to clients who are considering selling, consigning or borrowing against their important jewelry.  We are the premier diamond buyers, Rolex buyers, and jewelry buyers in Aventura, Bal Harbour, and Coconut Grove. Our market directors are experts located in the South Florida market, offering unparalleled expertise and market analysis when it comes to selling or getting a loan secured by your fine jewelry items. Our jewelry-secured loans are night and day different from when a person pawns jewelry.

Diamond Banc of Aventura is an extension of our luxury Diamond Banc brand, which has locations in premier cities across the nation. This ensures you receive the highest possible value assessment for your items in a confidential and polished environment. Our expert jewelry & Rolex buyers in Aventura will provide you with an accurate evaluation and financial solution that is tailored to your specific needs and desires. We offer discretion when selling their jewelry—we offer private appointments at our offices in Coral Gables & Aventura to ensure confidentiality during each sale, consignment, or loan transaction. Our directors provide every client with individualized attention, and industry-leading offers.

The Best Gold Buyer in Aventura

For clients looking to sell their gold, Diamond Banc purchases a variety of gold items, including unworn pieces, broken jewelry, scrap gold, dental gold, and more. With a longstanding partnership with some of the largest refiners in the country, Diamond Banc can offer the highest payouts for unwanted gold items. Clients can receive immediate, hassle-free funding upon accepting an offer.

Aventura’s #1 Diamond Buyer

Diamond Banc also specializes in buying diamond jewelry, including loose diamonds, diamond engagement rings, and other high-value diamond jewelry items. The team of diamond-buying experts assesses the value-adding elements of each diamond and provides an accurate market value, regardless of whether the diamond is certified or not. Diamond Banc offers a range of liquidity options, including an immediate cash purchase, consignment services, and VIP Seller’s Agent Service for high-value items.

Rolex & Luxury Watch Buyer in Aventura

As a top Rolex watch buyer in Aventura and Miami, Diamond Banc provides clients with top value and exceptional service for their luxury timepieces. The team is highly skilled in evaluating all factors that contribute to the value of each timepiece, including model, age, condition, and rarity. With a network of Diamond Banc locations across the country, the team stays up-to-date on the latest market trends for Rolex watches and offers the highest value possible for all models.

Clients looking to sell other luxury timepieces from top brands such as Patek Philippe, Audemars Piguet, and more can also turn to Diamond Banc. With extensive expertise in the luxury watch market, Diamond Banc provides clients with top value and exceptional service for their timepieces.

Loans Secured By Your Jewelry

Collateralized loans are a popular option for those seeking immediate funding while retaining ownership of their valuable jewelry. At Diamond Banc of Aventura, we specialize in providing collateralized loans secured by diamonds, gold, luxury watches, and other high-value fine jewelry items. Our lending process is simple, secure, and confidential, with pro-consumer loan terms that can be tailored to your preferences and situation. 

We are the nation’s leader in providing collateralized loans, offering loans secured by one item or entire collections. Our loan values are the highest in the industry, and our borrowing costs are the lowest in all of Miami. Our team of experts is dedicated to providing personalized service and helping clients magnify the fiscal power of their jewelry.

Our clients have the option to redeem their collateral under favorable repayment terms, and generally receive the same amount of proceeds as they would by selling outright. We routinely loan clients up to $350k+ and our loan terms can be adjusted to suit your specific needs. Receive the same amount of proceeds as if you sold your item, but maintain ownership with our jewelry Equity Loans in Aventura, Bal Harbour, and Coconut Grove.

Diamond Banc of Miami, Aventura Branch

Diamond Banc, serving Aventura, provides top-quality consultation for clients who wish to sell jewelry in Miami. Our market directors are experts in the South Florida market, offering unparalleled expertise and market analysis when it comes to selling or getting a loan secured by your fine jewelry items. This ensures you receive the highest possible value assessment for your items. Our expert buyers in Aventura will provide you with an accurate evaluation and financial solution that is tailored to your specific needs and desires.

We are trusted by people who want discretion when selling their jewelry—we offer private appointments at our offices in Coral Gables & Aventura to ensure confidentiality during each sale. Our staff is trained to provide every client with individualized attention so we can obtain the most accurate evaluation of your item’s value and help you understand how this reflects its market value and resale potential. As a result, we can provide you with an array of liquidity options based on the funding you are seeking to secure from your precious metals, diamonds, and luxury watches while also providing you with peace of mind that each transaction is simple and secure.

Diamond Banc of Aventura proudly serves clients West Island Blvd, Biscayne Blvd, Turnberry Way,  City Center,  East Island Blvd, Golden Beach, Point East Drive, Country Club Estates, Yacht Club, Aventura Central Island, Aventura Mall, North Island, Prive Island, South Island, Waterway Village, Marina Palms Yacht Club, Aventura Estates,  Echo Condos, Mystic Point, The Peninsula Aventura, & William’s Island.