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Item specifics

Metal Purity: 10k sapphire ring: yellow gold sapphire ring
Main Stone: Synthetic Sapphire 10K yellow gold sapphire ring: ostby Barton sapphire ring
Country/Region of Manufacture: United States antique ostby barton sapphire ring: antique ostby barton jewelry
Ring Size: 6 vintage sapphire ring: vintage ostby barton ring
Style: Solitaire with Accents engagement ring: 10K yellow gold engagement ring
Metal: White Gold vintage ostby barton engagement ring: antique ostby barton engagement ring
Featured Refinements: Antique Gold Ring victorian engagement ring: victorian ostby barton engagement ring

Ostby & Barton

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Tracks 5 clinically proven signs of fertility.

Wear Ava at night to see your 5 most fertile days.


Wear Ava at night to see your 5 most fertile days.

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  • Cycle insight

    Understand how your cycle impacts your health with features like symptom tracking, trend analysis, graphs, and more. Trend analysis lets you see how your menstrual cycle impacts the way you feel throughout the month.

  • Health data

    Tracks your sleep, physiological stress levels, and resting heart rate—so you can see whether your lifestyle is supporting optimal health.

  • Effortless

    There’s no need to take your temperature or pee on sticks. Just wear Ava when you sleep and sync when you wake up.

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  • Real-time detection of fertile window

    Ava is clinically proven to detect the very beginning of the fertile window—in real time, as it happens. That’s totally different than LH tests, which only detect the last day or two of the fertile window, and the temperature method, which only confirms ovulation after the fact.

  • Conceive faster

    Couples who time intercourse accurately double their chances of conceiving in a given month.*

  • Pregnancy tracking

    Ava is still there for you once you conceive. Once you get pregnant, get a whole new app experience with detailed explanations about what to expect in each week of pregnancy. You’ll be able to continue tracking your sleep, physiological stress, and resting pulse rate, as well as compare your weekly weight gain to standard recommendations.

For wherever you are in life

Track your cycle naturally

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If you’re not using hormonal birth control, Ava provides a profound connection to your natural cycle, deepening your understanding of your body in a way that has never before been possible.

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Try to conceive

The Ava bracelet is a new way to find your fertile window. It’s easier to use and more accurate than other methods.

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Understand your pregnancy

Track your health during pregnancy with continued monitoring of sleep, physiological stress, resting pulse rate, and weight gain. Get week-by-week content about your changing body and growing baby.


What makes Ava different?

  • Only Ava tracks 5

    Ava is the only method that tracks 5 clinically proven signs of fertility

  • Convenience

    Wear Ava while you sleep, and the rest is taken care of.

  • Real-time data

    Ava detects the fertile window based on real-time data from your body

  • More time to conceive

    Ava is clinically proven to detect an average of five fertile days per cycle—giving you and your partner more flexibility around planning for babymaking.

  • Backed by science

    Ava was created by a team of doctors and researchers committed to advancing scientific understanding of the menstrual cycle. We don’t just make products, we conduct clinical studies and publish peer-reviewed papers.

  • For more than just getting pregnant

    In addition to your fertile window, Ava tracks your sleep, physiological stress level, and resting heart rate, providing a holistic understanding of your health.

See who is wearing Ava

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Received my bracelet in August and started using it immediately…first and second cycles it predicted my ovulation to be about a week later than I had been thinking…and guess what? I am now pregnant. On my SECOND CYCLE with the Ava bracelet. I’m officially a fan. Lizzie
I had migraine headaches randomly throughout the month. With Ava, I realized that I always get them like clockwork right after I ovulate. Ava didn’t solve my headaches (if only!) but it does help me be more prepared for them, so they never take me by surprise anymore. Nurit
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Get your Ava

Take charge of your cycle with Ava—the only method to track 5 clinically proven signs of fertility.

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