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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 | 1 - 3 business days | 2 - 5 business days |
| First Class | 1-2 business days | 2 - 4 days | 3 - 6 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 love the Black Hole Necklace! It is so awesome to have a piece of history to wear. It is very distinctive.
I was thrilled to find Boutique Academia which has an amazing collection of unique jewelry reflecting the beauty of our biology and environment. Good and responsive service as well!
A five star rating well deserved... Boutique Academia provides a great and efficient service and the Tardigrade necklace I bought, without any problem, is as beautiful as I thought... Love the concept !
i got several constellations that i know exactly fit each of my friends. fantastic find. i'm very pleased with the results.
I bought this necklace for my daughter who has a PhD in neuroscience. It ties in wonderfully with her research.
Serotonin, Dopamine, & Acetylcholine Necklace
i am a biologist who works as a chemist with a sister who is an engineer. I love finding jewelry and key fobs that represent what i do. i have been sharing the business cards that came in the box with each item with fellow STEM women. They are also rather geeked about this. YAY! it it about time someone did this!
I bought a Serotonin+dopamine+acetylcholine necklace for our colleauge when She stopped workin in our company. It is so lovely and she really appreciated it.
Just love the earth from moon earrings--always one of my favorite pix--I have it on the wall at home--now I can wear proudly on my ears!!!
Necklace was exactly what I was looking for -- very well made, chain was perfect length. Seemed like I received it within 48 hours of ordering... I think that's right. Anyhow, many thanks!
My wife is the head of biology at a biotech company, and she squealed in delight when she opened this. She has already worn it several times in the last two weeks and her colleagues have loved it too.
I bought this for my author friend as a graduation present and she loves it! It's so unique, pretty and well made.
This necklace made a great gift for a recent grad and budding neuroscientist! Item arrived quickly and was as pictured; good size, quality, and detail.
Looks great. I bought it for a gift... but might keep it!
i love this necklace. it's beautiful and nicely weighted. so happy with it!
Love both pieces. My students really think I am a science geek now.
I absolutely loved the key chain. The craftsmanship was wonderful and shipping was fast.
The pendant has a nice weight to it, and it's the perfect size. Orion was the first constellation I was able to identify, and it remains my favorite. Very pleased to be able to have it near me even when it's no longer in the night sky.
Love it. Decent weight,good quality chain, appreciate the cristae, worn it every day since I got it.
I bought this for my girlfriend’s birthday coming up. When it arrived, I was pleased by its weight; it does not feel like lightweight, cheap construction so I’m not worried about it deforming if it gets dropped.
We gave one of our purchases, the atom necklace, to my daughters favorite teacher. She wore it the next day and her fellow science teachers all commented on how much they liked it. My daughter chose the blue nebula necklace for herself and loves it! We will definitely be back for more!
From a fantastic design, great craftsmanship, and quality materials this necklace is unbelievable. The best part is the center cover that pivots to reveal the interior of the virus. It is one of those necklaces that people just have to comment and ask about.
The T4 phage earrings are very comfortable, not heavy at all. I don't notice them until their heads brush against my neck... or catch on a scarf or sweater. (The collar whiskers are blunt but snaggy, easily dealt with if you're mindful of it.) (Dear Reader, I was not initially mindful.) I'm very pleased with them, and may have to get the necklace as well. A very fun find.
Maile was very responsive to emails and accommodated requests accurately and promptly.
My daughter absolutely loved the Brain Keychain that I purchased from you. She is a premed student and was so amazed as to the detail of the brain on the keychain. Will definitely buy from you again!
Bought this necklace for my math and science loving daughter. Not only was it the perfect gift but it arrived only 3 days after ordered and in a box too! Which I thought was nice but my daughter immediately noticed the science and math designs and loved the box too.
This is a very well-made necklace that can accessorize many different outfits. It is a subtle reference with elegant properties
I was looking for a unique gift for my friend who says she is a citizen of the Galaxy, The “ galaxy” necklace was perfect and she wears it all the time.
It was a Valentine's Day gift and a success! And the added emphasis on STEM for girls is fantastic
Thanks for replacing the broken atomic necklace for my daughter. Super service.
This necklace is great quality and beautifully made. I can't wait to give it to my math nerd daughter on 3/14. It's ok that I call her a math nerd because she gets it from me. 😉 I will order from them again. Oh yes, everyone also mentions the box it comes in - one word - AWESOME!
I received this and the eclipse necklace for Valentine's Day. I had seen the globe necklace on the website and can assure you it is SO MUCH PRETTIER in person! I was worried it would be a little hokey, but it's not at all. I am a college professor and received several compliments from colleagues the first day I wore it!
I absolutely love this necklace. This and another necklace were my Valentine's Day gifts :) The eclipse necklace is a little larger than a quarter and so pretty. I am a biology and ecology professor and I love to have jewelry that is subtly related to my field. This is scientific without being too kitschy.
So Cute! I bought this as a mother's day gift for my little sister and her daughter. Can't wait to give it to them!
