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$ 24.99
Avogadro's constant: "the number of elementary entities per mole of substance". It's a big number...which is to say, there's a lot of stuff in the universe. Wear a piece of it with this hand-stamped tie bar.
Available in aluminum or bronze, it is sturdy enough to last a lifetime. (Note that hand-stamped lettering varies a little, so yours will be charmingly unique.)
Perfect for:
FREE SHIPPING for orders over $45 within the United States. Buy several items-- keep some and give others as gifts! If you don't quite hit the $45 total, First Class delivery within the U.S. is $3.50 per order, and Priority is $6.50 per order. Gift boxes are ALWAYS included for orders within the U.S. Unless otherwise stated above (near holidays), your order will be processed and mailed within 2 business days. (Near holidays, we often mail out same-day.)
| UNITED STATES | mailed within | in transit for | from ordering to arrival |
| Priority Mail | 1-2 business days | 2 - 4 business days | 3 - 6 business days |
| First Class | 1-2 business days | 3 - 5 days | 4 - 7 business days |
For all countries outside the United States, USPS First Class International shipping without gift boxes is $6 per order. Please note: USPS First Class International shipping can take a very long time to arrive, averaging 4 - 12 weeks, depending on the country. USPS tracking numbers will work only until the package leaves the United States. We will replace packages that go missing before exiting the US border, but cannot replace packages that disappear after that.
The customer is responsible for any VAT or import tax charges.
We are so sure that you (or your lucky gift recipient) will love our jewelry that we have a 100% Satisfaction Guarantee! If you are unhappy with your order for any reason, even if you just decided it wasn't your style after all, simply mail back your undamaged, unworn jewelry and we will give you a full refund minus shipping. Check our reviews... our goal is to get ALL THE STARS. If you have any kind of problem with your order, please email us at maile@boutiqueacademia.com. We want all of our customers to be completely satisfied!
I not only enjoyed the uniqueness of the products, they had very good quality. I had problems with the delivery service but Boutique Academia took care of it and helped me. I personally liked the quality and aesthetics of the molecule shaped earings more than the necklaces.
Hello. I ordered 2 necklaces; a Tardigrade necklace and a molecular necklace. They came very quickly. I really, really like them! The Tardigrade necklace is quite the conversation piece. It is so unique. The molecular necklace, I got for my niece. She loves it. She shows it to everyone. Thanks so much and keep up the good work!
What an original business. Our niece is brilliant in the sciences. Honestly, she will find a cure to some disease! The necklace we chose was perfect for her! “She Who Dares Wins” So true...
I purchased speed of light necklace and Fibonacci earring for my daughter, who is a university student majoring in physics, she loved it. The jewelry is good quality and very well made, and the items were nicely packed and showed up in my mailbox quickly. I am so glad I found this source for unique gifts for my STEM friends! I am a physicist myself, and I hope the selection of physics-related items will grow, so I have gifts for all my physics friends.
A friend sent me the tardigrade necklace as a gift, and I was pleasantly surprised and pleased with the quality and solid heaviness of the tardigrade pendant. I love it so much I decided to pay it forward, so ordered another one to send to another tardigrade-loving friend, and she loves hers!
An adorable little badass you can carry with you to find your own resilience when you need it most. Smaller and easier to wear than the vertical one, with satisfying little toes to play with as you gaze into the abyss.
I LOVE MY NECKLACE!! It is cute and fun and educates my kids.
The kids and I purchased earrings for my wife for Mother's Day. While she received several gifts, she continued to comment on how much she loved the earrings!
I live with strong women. This necklace epitomizes how I feel about Heather and how she bravely attacks her challenges. Thank you for making it!
They were a birthday present for my niece who is an architecture student. She knew what they were immediately and she loves them. It was really nice to find a place devoted to jewelry that represents the sciences and professions. Things that have special meaning to those who try to find order in the world.
The pieces I bought were all beautifully made and unique. I like wearing interesting pieces that people ask me questions about.
Our daughter was excited to receive the heart necklace, which arrived on time as promised.
I have purchased the black hole necklace and earrings, Fibonacci necklace and earrings, and two tardigrade necklaces (my 6 year-old son loves tardigrades, we each have one). They are all beautiful, well designed, and better quality than the price might suggest. The earrings are light weight and comfortable and the necklaces are thoughtfully designed. I will definitely be purchasing more jewelry from them.
I bought 2 necklaces for my wife and one for my sister. My wife’s face lit up when she saw them. Perfectly captured what she stood for! “She who dares wins!”
I bought a tardigrade necklace and an atomic necklace, and I'm in love with both!
I absolutely love my Ad Astra Per Aspera Necklace from Boutique Academia. I've worn it nearly ever day since receiving it. The leather cord can be easily adjusted without removing the necklace and both the cord and the Ad Astra Per Aspera pendant are great quality and will hold up for a long time.
As a women working in a STEM field, I love that a company like Boutique Academia exists, for my sake and also for young girls and women in these fields. Thank you for making these beautiful pieces! I already have my eye on several other items.
So happy with the necklace. It is adjustable in length and very pretty.
I have been wearing this necklace every day since it came in and I absolutely love it! The look is so unique and I love how accurate it is to represent the actual constellation.
Great quality! Every person who has received these gifts has loved them.
i absolutely love this necklace, its super pretty and good quality. it has a nice weight to it as well. i really love it and would definitely recommend this!
I love this simple bar necklace. I love to wear my geekiness understated at times, and this is such a great way to do that! It's the perfect size, it's clear to make out, and I just freaking love it! I haven't seen anything else like this online, and the gift box was so fantastically cute. Definitely will purchase more from this shop.
I love the book necklace. What a beautiful piece of jewelry. You were as fast as Amazon at delivering it. Thank you.
Bought it for a friend who loved it! Very unique necklace.
I bought this as a gift for my sister. She loves it! When the chain I requested for the necklace was out of stock, they reached out to me about it and gave me alternatives which was super nice! Shipped quickly too.
The jewelry is well made, not cheap, and beautiful. They inspire hope in Science and curiosity from others.
Bought this for my 13 year old niece for her 3.14 birthday. She loved it! Wears it everyday. She had to explain the significance to her friends, who upon learning it, thought it was the coolest gift. It is hard to impress teenage girls...so thanks for this awesome gift!
Thanks for shipping this so quickly. I have already received list of compliments on the necklace
Leonardo da Vinci's Flying Machine Necklace
These necklaces are amazing and perfect for my purposes as bridesmaid gifts in my book themed wedding!
The necklace looks just as pictured. I plan on wearing it every year on pi approximation day. It is priced appropriately for the quality.
I gave this to a really close friend of mine because I thought of her as soon as I saw it. She absolutely loved it and it’s gorgeous. No regrets!
I was quite pleased with this necklace and my mathematics daughter who teaches at the college level was thrilled to receive this gift! Thank you for your creative math inspiring necklace.
