Diamond Mattress Obsidian Tight Top Medium

The Diamond Mattress Obsidian Tight Top Medium offers a balanced, traditional innerspring feel designed for dependable support and everyday comfort. Available now at The Mattress Clinic in Moore, OK, this mattress is ideal for shoppers who prefer a classic, no-nonsense sleep surface without the contour of foam or the plushness of pillow tops. It delivers a stable Medium feel that suits back and stomach sleepers especially well. If you’d like some additional help understanding which firmness best fits your body or sleep preferences, optional insight from APRN-CNP Quynh Boerner is available — but only if desired.

Key Features & Construction

Built with a durable innerspring support system and a classic tight-top design, the Obsidian Medium provides consistent performance for sleepers who prefer a more traditional mattress feel.

Key features include:

• 13" profile height

• Traditional innerspring support system

• Tight top for a firm, uniform surface feel

• Quilted upholstery layers for comfort without excessive sink

• Durable construction for long-term use

• Reinforced edges to increase usable sleeping surface

• Flat, non-compressed delivery for optimal longevity

• Made in the USA

Cooling & Temperature Control

This model features non-cooling comfort layers, creating a traditional feel without gel foams or cooling technologies. The open design of the innerspring system still allows natural airflow, helping reduce heat buildup compared to all-foam beds.

Support System & Long-Term Durability

Designed with a classic innerspring structure, this mattress provides stable, reliable support for sleepers who prefer a Medium feel. The durable coil system holds up over time and helps minimize sagging, making it a strong option for Moore families looking for long-lasting value.

Motion Cancellation Performance — Good

This mattress earns a Good motion cancellation rating:

• Innerspring coils offer moderate motion isolation

• Tight-top design reduces excessive bounce

• Suitable for single sleepers or couples who are not overly motion-sensitive

Pressure Relief for Sensitive Areas

Quilted comfort layers provide modest pressure relief without the deep contouring of memory foam. Ideal for sleepers who prefer a flatter, more supported surface rather than a sinking or body-hugging feel.

Spinal Alignment & Back Support

The Medium feel and innerspring core work together to maintain a neutral spinal position for back and stomach sleepers. The tight-top construction adds firmness and reduces body sink, helping keep hips and shoulders supported evenly.

Adjustable Base Compatibility

This mattress is not compatible with adjustable bases due to its traditional innerspring design and tight-top construction.

Who This Mattress Is Best For

• Back sleepers seeking a balanced Medium feel

• Stomach sleepers requiring extra surface firmness

• Shoppers who prefer a classic, traditional mattress feel

• Moore families seeking budget-friendly value

• Sleepers who want a no-sink, stable sleeping surface

• Anyone preferring a simple, dependable innerspring design

Mattress Size Guide

Why Try This Mattress at The Mattress Clinic?

At our Moore, OK showroom, you can compare traditional innerspring mattresses against hybrid and latex models to understand which feel best fits your needs. If you'd like additional guidance, optional insight from APRN-CNP Quynh Boerner is available to help you understand how different comfort levels and support systems may align with your sleep habits.

Visit Us In-Store

Try the Obsidian Tight Top Medium in person at our Moore location. Take time to compare Medium, Firm, and Plush feels and use our 10-minute comfort test to find the best match.

365 Night Sleep Great or Exchange Guarantee

180 Night Low Price Promise

Return Policy 

365 Night Sleep Great or Exchange Guarantee

A new mattress is like a new pair of shoes—it takes time for the new materials and your body to adjust to each other. And with the wrong socks (bedding), you could end up hating the correct shoes for you. Typically, it takes about 35–40 days for a mattress to start performing at its best if you use the proper bedding. After this “break-in period,” if you feel a different mattress style might work better, you may exchange your mattress up to 365 days from the purchase date. Using our bedding products with our mattresses ensures that the bedding isn’t causing any issues and that it is, in fact, the mattress that’s the problem. This is why you need a protector & pillow from us to receive the Exchange Guarantee.

These policies constitute the “365 Night Sleep Great or Exchange Guarantee” 
A $199 or 10% Exchange Fee (whichever is greater) applies to all reselections. This fee covers delivery for swapping the mattresses up to 20 miles from the store. The Mattress Clinic will allow a one-time re-selection ONLY after the 35-day adjustment or “break-in” period (Tempur-Latex 40-days). You have 365 days from the purchased date to exchange your mattress. You may select a mattress of equal or greater value of the same size. If you select a sleep surface of greater value, you will be responsible for the difference in price. If a reselection is of lesser value, no refund will be given. The original mattress purchase must include a mattress protector and pillow purchased before the mattress is received. The mattress surrendered must be stain free and odor free. We are unable to exchange stained, unsanitary, odor damaged (smoke/pets etc.), or damaged (ripped, burns, etc) mattresses under the Exchange Guarantee. Products must have been used only for their intended purpose. This includes using the product on an appropriate base, frame, or foundation.

Please take your time in your reselection choice; only ONE comfort exchange is allowed per customer. keep all receipts and original tags on your mattress. The Exchange Guarantee will be voided if you remove the original tag from the mattress or lose your proof of purchase. 
 
Reselections are not allowed for issues regarding mattress size or height. Bedding accessories such as pillows, protectors, sheets, adjustable bases, bedding foundation or furniture, are not eligible for exchanges. Reselections are not valid on “special sizes” (California King, split Queen, Etc.), custom orders, clearance merchandise, floor models or warranty exchanges. Your mattress reselection will be sold at “normal” sale price. Any discounts/gifts given with your original purchase of mattress, sheet set(s), mattress protector(s), pillow, and/or non-purchased gift cards will be added to the exchange fee. This means if you receive a discount/gift with your mattress and/or qualifying items and want to exchange it for the same mattress but a different feel, you are to pay the difference of the discount(s)/gift given, the exchange fee, plus any price increases made since your purchase (if increased). Your re-selection must be the same size as your original mattress purchase, Example: Queen for Queen. 

180 Night Low Price Promise
Subject to the following terms, we will match any advertised price of the same product. Within 180 days of purchase, bring the advertisement to a Mattress Clinic store, and we will credit your account or give you a refund check for the price difference. Our 180 Night Low Price Promise does not apply to clearance items, floor models, vendor rollbacks/rebates, special purchases, promotional items, doorbusters, discontinued merchandise. Merchandise offered for sale on auction sites (i.e., eBay, Craigslist, Facebook, etc.) or by Closeout/Overstock/Bulk dealers (e.g., Costco, Sams Club, Overstock.com, The Dump, Wayfair.com, Amazon.com) is excluded from the 180 Night Low Price Guarantee.

Return Policy

All sales are final. There are no "return of payment(s)" on items purchased after delivered or picked up. If wish to cancel before receiving the merchandise, there will be a 15% restocking fee.

Additional Information:
MATTRESS CLINIC IS NOT RESPONSIBLE FOR LOADING, TIE DOWN, OR SECURING PRODUCT IN PERSONAL VEHICLES. WHEN LOADING VEHICLE IF DAMAGE(S) OCCUR TO PRODUCT OR VEHICLE, THE CUSTOMER IS HELD RESPONSIBLE. All purchases made prior to October 14th, 2025, at 10:00 AM CST will be governed by the rules and regulations that were in play at the time you purchased. See store for details regarding purchases made before 10/14/2025.

Please contact Customer Care with any questions. Any situations/sales/or deals made that are not explained or mentioned above will be handled by the owner as he sees fit.

365 Night Sleep Great or Exchange Guarantee

180 Night Low Price Promise

Return Policy 

365 Night Sleep Great or Exchange Guarantee

A new mattress is like a new pair of shoes—it takes time for the new materials and your body to adjust to each other. And with the wrong socks (bedding), you could end up hating the correct shoes for you. Typically, it takes about 35–40 days for a mattress to start performing at its best if you use the proper bedding. After this “break-in period,” if you feel a different mattress style might work better, you may exchange your mattress up to 365 days from the purchase date. Using our bedding products with our mattresses ensures that the bedding isn’t causing any issues and that it is, in fact, the mattress that’s the problem. This is why you need a protector & pillow from us to receive the Exchange Guarantee.

These policies constitute the “365 Night Sleep Great or Exchange Guarantee” 
A $199 or 10% Exchange Fee (whichever is greater) applies to all reselections. This fee covers delivery for swapping the mattresses up to 20 miles from the store. The Mattress Clinic will allow a one-time re-selection ONLY after the 35-day adjustment or “break-in” period (Tempur-Latex 40-days). You have 365 days from the purchased date to exchange your mattress. You may select a mattress of equal or greater value of the same size. If you select a sleep surface of greater value, you will be responsible for the difference in price. If a reselection is of lesser value, no refund will be given. The original mattress purchase must include a mattress protector and pillow purchased before the mattress is received. The mattress surrendered must be stain free and odor free. We are unable to exchange stained, unsanitary, odor damaged (smoke/pets etc.), or damaged (ripped, burns, etc) mattresses under the Exchange Guarantee. Products must have been used only for their intended purpose. This includes using the product on an appropriate base, frame, or foundation.

Please take your time in your reselection choice; only ONE comfort exchange is allowed per customer. keep all receipts and original tags on your mattress. The Exchange Guarantee will be voided if you remove the original tag from the mattress or lose your proof of purchase. 
 
Reselections are not allowed for issues regarding mattress size or height. Bedding accessories such as pillows, protectors, sheets, adjustable bases, bedding foundation or furniture, are not eligible for exchanges. Reselections are not valid on “special sizes” (California King, split Queen, Etc.), custom orders, clearance merchandise, floor models or warranty exchanges. Your mattress reselection will be sold at “normal” sale price. Any discounts/gifts given with your original purchase of mattress, sheet set(s), mattress protector(s), pillow, and/or non-purchased gift cards will be added to the exchange fee. This means if you receive a discount/gift with your mattress and/or qualifying items and want to exchange it for the same mattress but a different feel, you are to pay the difference of the discount(s)/gift given, the exchange fee, plus any price increases made since your purchase (if increased). Your re-selection must be the same size as your original mattress purchase, Example: Queen for Queen. 

180 Night Low Price Promise
Subject to the following terms, we will match any advertised price of the same product. Within 180 days of purchase, bring the advertisement to a Mattress Clinic store, and we will credit your account or give you a refund check for the price difference. Our 180 Night Low Price Promise does not apply to clearance items, floor models, vendor rollbacks/rebates, special purchases, promotional items, doorbusters, discontinued merchandise. Merchandise offered for sale on auction sites (i.e., eBay, Craigslist, Facebook, etc.) or by Closeout/Overstock/Bulk dealers (e.g., Costco, Sams Club, Overstock.com, The Dump, Wayfair.com, Amazon.com) is excluded from the 180 Night Low Price Guarantee.

Return Policy

All sales are final. There are no "return of payment(s)" on items purchased after delivered or picked up. If wish to cancel before receiving the merchandise, there will be a 15% restocking fee.

Additional Information:
MATTRESS CLINIC IS NOT RESPONSIBLE FOR LOADING, TIE DOWN, OR SECURING PRODUCT IN PERSONAL VEHICLES. WHEN LOADING VEHICLE IF DAMAGE(S) OCCUR TO PRODUCT OR VEHICLE, THE CUSTOMER IS HELD RESPONSIBLE. All purchases made prior to October 14th, 2025, at 10:00 AM CST will be governed by the rules and regulations that were in play at the time you purchased. See store for details regarding purchases made before 10/14/2025.

Please contact Customer Care with any questions. Any situations/sales/or deals made that are not explained or mentioned above will be handled by the owner as he sees fit.