J. Thomas Jewelers was established in 1995 by Tom Costigan as an independently-owned jewelry store. Now in operation for more than 26 years, J. Thomas Jewelers has garnered numerous design awards and recognitions from organizations such as the Independent Jewelers Organization, Michigan Jewelers Association, and Top Rated Local. Meet our exceptional staff, comprising of sales professionals and jewelry designers. We have over 80 years of combined industry experience and business knowledge. Our store specializes in creating a unique diamond buying experience.

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Our Mission/Our Promise

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J. Thomas Jewelers was founded in 1995 by Tom Costigan and is family owned and operated. This is the 13th jewelry design award for our store. In 2019 J. Thomas Jewelers was awarded the Top Rated Local. The store offers an excellent selection of premium diamonds and we are proud to feature the largest selection of engagement rings in Oakland County.

Diamond Buying Tips

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Some people want to buy the biggest diamond possible. Is this always the right choice? The larger the diamond, chances are the more inclusions it likely has, and because it's larger, these inclusions are typically even more visible than on a smaller diamond. But most importantly, if the diamond cut isn't proportioned correctly, it won't return the maximum amount of light through the top of the diamond. This illustrates that no matter how large the diamond, its cut and proportions determine how brilliant the diamond really is.

Choosing the Ring

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Solitaire settings are great if you have a stunning singular stone that has been passed down through the generations as an heirloom, many choose to display it in a classic Solitaire setting. This setting generally allows for the maximum amount of sparkle by allowing light to pass in through the bottom sections of the ring.

Birthstone Guide

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Garnet comes from the Latin word granatus, meaning grain. Garnet is mostly mined in Southeast Asia, Brazil, and Africa. Occurring in every color except blue, the garnet is a versatile stone, appropriate for a multitude of applications and occasions. Amethyst is a member of the quartz family, and ranges in color from light to deep purple.

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