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Semsons Tech Reference ST4820
Model ST4820 · 2.3 L tank · 40 kHz
Price per piece
₹7,999
Inclusive of 18% GST (₹6,778.81 + ₹1,220.19 GST)
A Semsons Tech ultrasonic cleaner for rings, chains, earrings and bangles. It cleans with water and sound waves, with no brush touching the metal.
✔ 2.3 L tank - sized for a showroom counter or a workbench
✔ 40 kHz - fine bubbles for finished jewellery and set stones
✔ No brush, no scratching - only water touches the piece
✔ Digital display - push-button controls with a start key
✔ Hinged lid with a window - watch the cycle, keep splashes in
✔ Slotted basket - keeps pieces off the tank floor
Security policy
Delivery policy
Return policy
Cleans rings, chains and settings in water, with no brush touching the metal.
Jewellery collects skin oil, soap, dust and polishing compound where a cloth cannot reach: under a prong, between chain links, behind a stone, inside engraving. The ST4820 cleans those places with sound waves in a 2.3 L tank of water. You put the pieces in the basket, close the lid and start the cycle. It sits on a showroom counter, a repair desk or a workbench.
Transducers under the tank make the water vibrate 40,000 times a second. That is what 40 kHz means. The vibration forms tiny bubbles that collapse against the metal and the stones, and each collapse knocks dirt loose. The water reaches every gap in the piece, so the cleaning does too, and nothing solid rubs against the surface.
Most gold, silver and diamond jewellery cleans well. Some stones and Indian pieces do not, so check the piece first.
| Piece | In the ultrasonic cleaner? |
|---|---|
| Solid gold, silver and platinum jewellery | Yes |
| Diamonds, rubies and sapphires in a secure setting | Yes |
| Loose or worn prongs | Not until the setting is repaired. The vibration can shake a loose stone out. |
| Pearls, coral and amber | No. Wipe with a soft damp cloth. |
| Emerald, opal, turquoise, tanzanite, lapis and malachite | No. Clean in warm soapy water with a soft brush. |
| Stones that are fracture-filled, oiled, dyed or glued | No |
| Kundan, polki and meenakari | No. The stones sit in lac and the enamel can be damaged. |
| Gold-plated and 1-gram gold | No. The vibration wears plating away faster. |
| Specification | Details |
|---|---|
| Model | ST4820 |
| Tank capacity | 2.3 L (2300 ml) |
| Ultrasonic frequency | 40 kHz |
| Type | Table-top ultrasonic jewellery cleaner |
| Brand | Semsons Tech |
| Controls | Digital display with push-button keys |
| Lid | Hinged, with a viewing window |
| Basket | Slotted basket inside the tank |
| Power | Mains lead |
| Dispatch | 10–15 days from the order |
| Terms | Details |
|---|---|
| Price | Shown at the top of this page, including 18% GST |
| Delivery | Free anywhere in India |
| Dispatch | About 10–15 days from the order. The courier transit time for your address is shown at checkout. |
| Order limit | Up to 10 units per customer per day |
| Returns | This product is non-returnable |
| Manufacturing defect | Replacement within 30 days of delivery, once the defect is verified |
A table-top ultrasonic jewellery cleaner with a 2.3 L tank that runs at 40 kHz. It cleans jewellery in water using sound waves instead of a brush.
Yes. 40 kHz makes small bubbles that clean fine settings, chain links and engraving without being harsh on finished pieces.
Yes, for solid gold, silver and platinum and for diamonds, rubies and sapphires in a secure setting. Check the prongs first, because the vibration can shake a loose stone out.
Pearls, coral, amber, opal, emerald, turquoise, tanzanite, lapis and malachite, and any stone that is fracture-filled, oiled, dyed or glued. Keep kundan, polki, meenakari, gold-plated and 1-gram gold pieces out as well. The table above says how to clean each one instead.
Water, with a few drops of mild jewellery-cleaning liquid or dish soap for oily dirt. Tap water works. Do not use petrol, thinner, alcohol or nail-polish remover.
Start with a short cycle of a few minutes and check the piece. Heavy polishing compound may need a second cycle. Leaving pieces in much longer adds nothing and shakes the settings more.
No. It removes dirt, oil and polishing compound. Tarnish is a chemical layer on the silver, so polish it off with a silver cloth first, then clean the piece in the tank.
Yes. At 2.3 L it fits on a counter or a bench, so a customer's ring or chain can be cleaned while they wait, and finished stock can be cleaned before display.
Yes. The price shown includes 18% GST, and the GST amount is listed separately on your tax invoice.
Delivery is free anywhere in India. The machine is dispatched about 10 to 15 days after the order, and courier transit comes after that. The checkout shows the transit time for your address.
Up to 10 units per customer per day. For a larger quantity, call the wholesale desk on +91 80823 38010.
No. This product is non-returnable.
Message us on WhatsApp within 30 days of delivery with your order number and what the fault is. Once the defect is verified, we replace the machine. Damage from a fall, misuse, the wrong cleaning liquid or normal wear is not a manufacturing defect.
Order it online on this page. For several units, a showroom chain or help choosing, message the sales desk.
Sales: WhatsApp +91 98216 12340 · Wholesale: +91 80823 38010
Semsons Tech - Where Quality Speaks For Us. Since 1978.
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