Black Agate Tunnel 6mm-25mm
Size Guide
Whether you're a piercing pro or just starting out, getting the right size matters — for comfort, safety, and style. Here’s a quick guide to understanding jewellery gauge and length so you can find your perfect fit.
📏 What is Gauge?
Gauge (G) refers to the thickness of the jewellery bar or post. It’s a standard measurement used across all body jewellery.
🔄 The smaller the gauge number, the thicker the jewellery.
| Millimetres (mm) | Gauge (G) | Common Uses |
|---|---|---|
| 0.8mm | 20G | Thin nose studs, earrings |
| 1.0mm | 18G | Nose rings, studs, lobe piercings |
| 1.2mm | 16G | Cartilage (helix, tragus), septum, daith, rook, lip, eyebrow |
| 1.6mm | 14G | Belly bars, nipple rings, tongue bars |
| 2.0mm | 12G | Stretching jewellery |
| 3.2mm | 8G | Stretching jewellery |
| 4.0mm | 6G | Stretching jewellery |
| 5.0mm | 4G | Stretching jewellery |
| 6.0mm | 2G | Stretching jewellery |
| 7.0mm | 1G | Stretching jewellery |
| 8.0mm | 0G | Stretching jewellery |
| 10.0mm | 00G | Stretching jewellery |
| 12.0mm | 1/2" | Plugs, tunnels |
| 14.0mm | 9/16" | Plugs, tunnels |
| 16.0mm | 5/8" | Plugs, tunnels |
| 19.0mm | 3/4" | Plugs, tunnels |
| 22.0mm | 7/8" | Plugs, tunnels |
| 25.0mm | 1" | Plugs, tunnels |
📐 Understanding Length
The length of your jewellery is measured as the internal distance between the two ends — whether that's balls, flat backs, or ring sides. It does not include the thickness or size of the ends themselves.
-
For straight bars: Measured between the two threads or ends
-
For curved bars: Measured in a straight line between the ends
-
For rings: Measured across the internal diameter, not the outer edge
This ensures you're getting the most accurate and comfortable fit.
📸 Need Help Visualising?
We’ve included diagrams below (or in the product listing) showing how to measure both gauge and length on common jewellery styles. Always refer to those visuals if you’re unsure, or feel free to reach out if you need help choosing the right size.
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Buy 4 Get 5th FREE - Code STOCKUP
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Free Shipping - over $100
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Same Day Dispatch - by 11am
Unless specified, items are sold individually (as single pieces)and are externally threaded.
- Material : Semi Precious Stone
- Gauge : 6mm (2G) to 25mm (1")
- Wear Area : 10mm
- Plug Style : Saddle Fit
Sold Individually
Shipping Information
All Australian orders are sent with tracking.
Australian orders are charged a flat rate of $9.99 for Parcel Post or $14.99 for Express Post
Current Shipping times within Australia are 2 to 8 business days. These are estimated delivery times as supplied by Australia Post and are out of our control.
Shipping insurance is available during checkout and provides order replacement if your order is lost or damaged during transit. This is handled by Australia Post and out of our control. We will assist, where possible, with all claims and concerns.
Ships from the Lockyer Valley near Brisbane, Qld.
Please double check the address provided. We will not be held responsible for delay or non-delivery because of inaccurate address details. (Or failure to collect from Post Office)
Orders over $100 may require a signature on delivery.
Packaging Policy: Handle with Care
We ensure that your purchases are properly packed before they are dispatched. This is to ensure that the delicate items do not get damaged during shipment.
Payment Options
Please note that all our prices are shown in AUD and include GST.
And our online store currently accept payment via these methods:
- Credit Cards
- PayPal
- PayPal E-cheques*
- Afterpay
- ZipPay
*E-cheques via Pay Pal usually take up to 5 days to clear- your orders will not be sent until payment has cleared.
Material Information
Material Information
MBPJ does not personally manufacture any of the items in our store. Material information is given as provided by our suppliers and Body Steel takes no responsibility for errors in material information.
316L Surgical Steel:
Implant quality 316L Surgical Steel is used in all our surgical steel body jewellery. This is the most common material used in body piercing jewellery due to its resistance to corrosion, low maintenance, and familiar shine. Quality surgical steel also has great biocompatility qualities and is great for most people to wear. 316L Surgical Grade Stainless Steel is also used for medical and dental implants.
Solid Titanium:
Most of the Solid Titanium sold by MBPJ is made from Implant Grade 23 Titanium (Ti6AL4V ELI). Some are Grade 5 and are clearly defined as such. Titanium jewellery is lightweight, high corrosion resistant and is hypoallergenic, which means this jewellery is perfect for anyone with allergic reactions or sensitivities to metal.
Titanium Anodized:
Titanium is anodized over the implant grade surgical steel jewellery giving it the same qualities as Titanium jewellery (hypoallergenic) as well as giving the jewellery an amazing coating of bright and bold colour.
14Kt Gold Plated:
We use the same 14Kt gold from our Solid Gold range to plate implant grade surgical steel jewellery, allowing you to get the look of luxurious gold jewellery at a fraction of the price.
Solid Gold:
Amazing styles and designs are available in our stunning range of 14Kt Solid Gold jewellery. All Solid Gold jewellery carries the Geniune 14Kt imprint.
Acrylic/Glass:
Acrylic and glass jewellery is a great option for anyone with sensitivities to metal. Acrylic is a popular choice for body jewellery due to its amazing range of colours and styles. It is very lightweight and easy to wear. Some styles of acrylic jewellery are UV, blacklight and glow in the dark, and bright, vivid solid colours.
Bioflex/PTFE:
Bioflex/PTFE jewellery has some amazing properties. It is hypo-allergenic, bendable, auto-clavable and non-magnetic. It is perfect for use in hospitals and when getting x-rays. It is a perfect for anyone wanting a little more flexibility in their jewellery.
Organics:
The organics range of body jewellery has, arguably, the most creative and stunning designs. Organic materials include bone, horn, wood, semi-precious stone, mother of pearl shell and abalone shell. Apart from the incredible styles available, Organics are very popular due to the fact the jewellery is natural, can 'breathe' and keeps steady with your body temperature. All this allows this exotic style of jewellery to 'fit' in with your body in a healthier way. Although a little more care is required to keep organic jewellery looking and feeling their best.
Please Note
Bars/posts will be made from the stated material, but other parts such as dangles and shields may be made from rhodium plated over brass or copper.
Gems are made from quality Cubic Zironia unless otherwise stated.
Colours may differ slighlty due to computer monitors.
Choose options
Size Guide
Whether you're a piercing pro or just starting out, getting the right size matters — for comfort, safety, and style. Here’s a quick guide to understanding jewellery gauge and length so you can find your perfect fit.
📏 What is Gauge?
Gauge (G) refers to the thickness of the jewellery bar or post. It’s a standard measurement used across all body jewellery.
🔄 The smaller the gauge number, the thicker the jewellery.
| Millimetres (mm) | Gauge (G) | Common Uses |
|---|---|---|
| 0.8mm | 20G | Thin nose studs, earrings |
| 1.0mm | 18G | Nose rings, studs, lobe piercings |
| 1.2mm | 16G | Cartilage (helix, tragus), septum, daith, rook, lip, eyebrow |
| 1.6mm | 14G | Belly bars, nipple rings, tongue bars |
| 2.0mm | 12G | Stretching jewellery |
| 3.2mm | 8G | Stretching jewellery |
| 4.0mm | 6G | Stretching jewellery |
| 5.0mm | 4G | Stretching jewellery |
| 6.0mm | 2G | Stretching jewellery |
| 7.0mm | 1G | Stretching jewellery |
| 8.0mm | 0G | Stretching jewellery |
| 10.0mm | 00G | Stretching jewellery |
| 12.0mm | 1/2" | Plugs, tunnels |
| 14.0mm | 9/16" | Plugs, tunnels |
| 16.0mm | 5/8" | Plugs, tunnels |
| 19.0mm | 3/4" | Plugs, tunnels |
| 22.0mm | 7/8" | Plugs, tunnels |
| 25.0mm | 1" | Plugs, tunnels |
📐 Understanding Length
The length of your jewellery is measured as the internal distance between the two ends — whether that's balls, flat backs, or ring sides. It does not include the thickness or size of the ends themselves.
-
For straight bars: Measured between the two threads or ends
-
For curved bars: Measured in a straight line between the ends
-
For rings: Measured across the internal diameter, not the outer edge
This ensures you're getting the most accurate and comfortable fit.
📸 Need Help Visualising?
We’ve included diagrams below (or in the product listing) showing how to measure both gauge and length on common jewellery styles. Always refer to those visuals if you’re unsure, or feel free to reach out if you need help choosing the right size.