Your Cart is Empty
$ 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 $8 per order. Gift boxes are ALWAYS included for orders within the U.S. Orders are 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 |
International Shipping
All international orders are shipping in individual black velvet gift bags instead of gift boxes to cut shipping costs. Please see your country below for shipping options. We do not currently ship to the European Union. The customer is responsible for any VAT or import tax charges.
| AUSTRALIA & NEW ZEALAND | Cost | Shipping Time | Tracking Code |
| USPS First Class International | Not Available | Not Available | Not Available |
| GlobalPost Economy | $20 | Less than 4 weeks | Tracks the entire delivery |
| ALL COUNTRIES EXCEPT EU | Cost | Shipping Time | Tracking Code |
| USPS First Class International | $10 | Up to 8 weeks | Tracks up to your country's border |
| GlobalPost Economy | $20 | Less than 4 weeks | Tracks the entire |
We do not currently ship to the European Union.
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 searched all over for a tardigrade and this one by far was the cutest and seemed to capture the zest and spirit of the tardigrade like no other. Nice to see a science theme geared for women too.
The perfect present for my daughter-in-law when she was accepted into Medicine!!
Necklace came fast, it’s all sterling silver and is beautiful.
Every purchase I have made from this place has been worth it! Please give this place a try!
My love of my life has been a cardiac nurse for well over 30 years and she absolutely adored these earrings. Cannot wait to buy her more from Boutique Academia. Service and quality were beyond expectations! Thank you so much!
So excited to have another excuse to shop at Boutique Academia. My whole family has now received gifts for various occasions from this amazing small business, and each jewelry item is met with enthusiasm.
The jewelry from Boutique Academia is high quality and beautiful. This necklace is no exception. I really like the long chain. I have bought several pieces from Boutique Academia and I love every single one of them.
My 15-year-old LOVES quetzalcoatluses. Pterodactyls are a close second, followed by pretty much any other dinosaur. She doesn’t love wearing earrings as a general rule because she is very sensitive to metals, but she LOVES these earrings and they don’t bother her skin! She likes wearing them as matched pairs and also appreciates the ability to mix and match. Score!!
Searched for something cool to buy for our nephew, who recently transitioned to teaching from a corporate career. Found the Pi tie pin, and hope he wears it well to work sometimes. Well made and a fun gift! Arrived on time and nicely boxed.
It’s all in dimension or is it. I will never know. The earnings and necklace were beautiful and customer service replied quick to my question. I ordered even before the response because I was 100% assured perfection. Happy New Year 2022
Who knew light could be this beautiful? This is not a costume piece. This is legit!
This piece is a treasure! Had purchased one similar almost 5 years ago. Unfortunately it broke as I wore it daily at a physical job. Even more unfortunate I was notified they werent in production any longer. Super bummed. Fast forward 3 years to late 2021 and i received an e-mail that it was back! Stoked! Bought 1 immediately then another as my sister was thoroughly impressed. Huge hit at my workplace with customers and coworkers! Thanks again for getting these beautiful pendants back out there!🌌🙏🏼
My granddaughter loves her necklace and I was impressed by the "speed" of shipping and quality. Happy to have found a science themed website!
My daughter loves the necklace. The onyx is beautiful and the star pattern is fabulous. It’s recognizable but not so obvious with the other minor nearby stars also depicted. The chain is also lovely. Thank you!
