<SEC-DOCUMENT>0000832988-19-000059.txt : 20190906
<SEC-HEADER>0000832988-19-000059.hdr.sgml : 20190906
<ACCEPTANCE-DATETIME>20190906114720
ACCESSION NUMBER:		0000832988-19-000059
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190906
FILED AS OF DATE:		20190906
DATE AS OF CHANGE:		20190906

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Drosos Virginia
		CENTRAL INDEX KEY:			0001554969

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32349
		FILM NUMBER:		191078860

	MAIL ADDRESS:	
		STREET 1:		CLARENDON HOUSE
		STREET 2:		2 CHURCH STREET
		CITY:			HAMILTON
		STATE:			D0
		ZIP:			HM11

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIGNET JEWELERS LTD
		CENTRAL INDEX KEY:			0000832988
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-JEWELRY STORES [5944]
		IRS NUMBER:				000000000
		FISCAL YEAR END:			0202

	BUSINESS ADDRESS:	
		STREET 1:		CLARENDON HOUSE
		STREET 2:		2 CHURCH STREET
		CITY:			HAMILTON
		STATE:			D0
		ZIP:			HM11
		BUSINESS PHONE:		44-207-317-9700

	MAIL ADDRESS:	
		STREET 1:		C/O 15 GOLDEN SQUARE
		CITY:			LONDON
		STATE:			X0
		ZIP:			W1F9JG

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SIGNET GROUP PLC
		DATE OF NAME CHANGE:	19931213

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	RATNERS GROUP PLC
		DATE OF NAME CHANGE:	19931213
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_156778482498664.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-09-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000832988</issuerCik>
        <issuerName>SIGNET JEWELERS LTD</issuerName>
        <issuerTradingSymbol>SIG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001554969</rptOwnerCik>
            <rptOwnerName>Drosos Virginia</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CLARENDON HOUSE</rptOwnerStreet1>
            <rptOwnerStreet2>2 CHURCH STREET</rptOwnerStreet2>
            <rptOwnerCity>HAMILTON</rptOwnerCity>
            <rptOwnerState>D0</rptOwnerState>
            <rptOwnerZipCode>HM11</rptOwnerZipCode>
            <rptOwnerStateDescription>BERMUDA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares, par value $0.18</value>
            </securityTitle>
            <transactionDate>
                <value>2019-09-06</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.1434</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>232181</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The price reported in Column 4 is a weighted average price.  These shares were purchased in multiple transactions at prices ranging from $13.50 to $14.50, inclusive.  The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or to the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range of prices set forth in footnotes to this Form 4.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Samuel Toth, Attorney in Fact</signatureName>
        <signatureDate>2019-09-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
